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// Copyright (c) 2004-2012 Sergey Lyubka
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if defined(_WIN32)
#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
#else
#ifdef __linux__
#define _XOPEN_SOURCE 600 // For flockfile() on Linux
#endif
#define _LARGEFILE_SOURCE // Enable 64-bit file offsets
#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
#define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX
#endif
#ifdef WIN32_LEAN_AND_MEAN
#undef WIN32_LEAN_AND_MEAN // Disable WIN32_LEAN_AND_MEAN, if necessary
#endif
#if defined(__SYMBIAN32__)
#define NO_SSL // SSL is not supported
#define NO_CGI // CGI is not supported
#define PATH_MAX FILENAME_MAX
#endif // __SYMBIAN32__
#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif // !_WIN32_WCE
#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
#define _WIN32_WINNT 0x0400 // To make it link in VS2005
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#ifndef PATH_MAX
#define PATH_MAX MAX_PATH
#endif
#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#else // _WIN32_WCE
#define NO_CGI // WinCE has no pipes
typedef long off_t;
#define errno GetLastError()
#define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
#endif // _WIN32_WCE
#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
((uint64_t)((uint32_t)(hi))) << 32))
#define RATE_DIFF 10000000 // 100 nsecs
#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
#define SYS2UNIX_TIME(lo, hi) \
(time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
// Visual Studio 6 does not know __func__ or __FUNCTION__
// The rest of MS compilers use __FUNCTION__, not C99 __func__
// Also use _strtoui64 on modern M$ compilers
#if defined(_MSC_VER) && _MSC_VER < 1300
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ "line " STR(__LINE__)
#define strtoull(x, y, z) strtoul(x, y, z)
#define strtoll(x, y, z) strtol(x, y, z)
#else
#define __func__ __FUNCTION__
#define strtoull(x, y, z) _strtoui64(x, y, z)
#define strtoll(x, y, z) _strtoi64(x, y, z)
#endif // _MSC_VER
#define ERRNO GetLastError()
#define NO_SOCKLEN_T
#define SSL_LIB "ssleay32.dll"
#define CRYPTO_LIB "libeay32.dll"
#define O_NONBLOCK 0
#if !defined(EWOULDBLOCK)
#define EWOULDBLOCK WSAEWOULDBLOCK
#endif // !EWOULDBLOCK
#define _POSIX_
#define INT64_FMT "I64d"
#define WINCDECL __cdecl
#define SHUT_WR 1
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define mg_sleep(x) Sleep(x)
#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
#define popen(x, y) _popen(x, y)
#define pclose(x) _pclose(x)
#define close(x) _close(x)
#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
#define RTLD_LAZY 0
#define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
#define fdopen(x, y) _fdopen((x), (y))
#define write(x, y, z) _write((x), (y), (unsigned) z)
#define read(x, y, z) _read((x), (y), (unsigned) z)
#define flockfile(x) EnterCriticalSection(&global_log_file_lock)
#define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
#define sleep(x) Sleep((x) * 1000)
#if !defined(fileno)
#define fileno(x) _fileno(x)
#endif // !fileno MINGW #defines fileno
typedef HANDLE pthread_mutex_t;
typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
typedef DWORD pthread_t;
#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
static int pthread_mutex_lock(pthread_mutex_t *);
static int pthread_mutex_unlock(pthread_mutex_t *);
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
#if defined(HAVE_STDINT)
#include <stdint.h>
#else
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
#define INT64_MAX 9223372036854775807
#endif // HAVE_STDINT
// POSIX dirent interface
struct dirent {
char d_name[PATH_MAX];
};
typedef struct DIR {
HANDLE handle;
WIN32_FIND_DATAW info;
struct dirent result;
} DIR;
// Mark required libraries
#pragma comment(lib, "Ws2_32.lib")
#else // UNIX specific
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>
#include <netdb.h>
#include <pwd.h>
#include <unistd.h>
#include <dirent.h>
#if !defined(NO_SSL_DL) && !defined(NO_SSL)
#include <dlfcn.h>
#endif
#include <pthread.h>
#if defined(__MACH__)
#define SSL_LIB "libssl.dylib"
#define CRYPTO_LIB "libcrypto.dylib"
#else
#if !defined(SSL_LIB)
#define SSL_LIB "libssl.so"
#endif
#if !defined(CRYPTO_LIB)
#define CRYPTO_LIB "libcrypto.so"
#endif
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif // O_BINARY
#define closesocket(a) close(a)
#define mg_mkdir(x, y) mkdir(x, y)
#define mg_remove(x) remove(x)
#define mg_rename(x, y) rename(x, y)
#define mg_sleep(x) usleep((x) * 1000)
#define ERRNO errno
#define INVALID_SOCKET (-1)
#define INT64_FMT PRId64
typedef int SOCKET;
#define WINCDECL
#endif // End of Windows and UNIX specific includes
#include "mongoose.h"
#ifdef USE_LUA
#include <lua.h>
#include <lauxlib.h>
#endif
#define MONGOOSE_VERSION "3.4"
#define PASSWORDS_FILE_NAME ".htpasswd"
#define CGI_ENVIRONMENT_SIZE 4096
#define MAX_CGI_ENVIR_VARS 64
#define MG_BUF_LEN 8192
#define MAX_REQUEST_SIZE 16384
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#ifdef _WIN32
static CRITICAL_SECTION global_log_file_lock;
static pthread_t pthread_self(void) {
return GetCurrentThreadId();
}
#endif // _WIN32
#ifdef DEBUG_TRACE
#undef DEBUG_TRACE
#define DEBUG_TRACE(x)
#else
#if defined(DEBUG)
#define DEBUG_TRACE(x) do { \
flockfile(stdout); \
printf("*** %lu.%p.%s.%d: ", \
(unsigned long) time(NULL), (void *) pthread_self(), \
__func__, __LINE__); \
printf x; \
putchar('\n'); \
fflush(stdout); \
funlockfile(stdout); \
} while (0)
#else
#define DEBUG_TRACE(x)
#endif // DEBUG
#endif // DEBUG_TRACE
// Darwin prior to 7.0 and Win32 do not have socklen_t
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif // NO_SOCKLEN_T
#define _DARWIN_UNLIMITED_SELECT
#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
#if !defined(SOMAXCONN)
#define SOMAXCONN 100
#endif
#if !defined(PATH_MAX)
#define PATH_MAX 4096
#endif
static const char *http_500_error = "Internal Server Error";
// Snatched from OpenSSL includes. I put the prototypes here to be independent
// from the OpenSSL source installation. Having this, mongoose + SSL can be
// built on any system with binary SSL libraries installed.
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
typedef struct ssl_ctx_st SSL_CTX;
#define SSL_ERROR_WANT_READ 2
#define SSL_ERROR_WANT_WRITE 3
#define SSL_FILETYPE_PEM 1
#define CRYPTO_LOCK 1
#if defined(NO_SSL_DL)
extern void SSL_free(SSL *);
extern int SSL_accept(SSL *);
extern int SSL_connect(SSL *);
extern int SSL_read(SSL *, void *, int);
extern int SSL_write(SSL *, const void *, int);
extern int SSL_get_error(const SSL *, int);
extern int SSL_set_fd(SSL *, int);
extern SSL *SSL_new(SSL_CTX *);
extern SSL_CTX *SSL_CTX_new(SSL_METHOD *);
extern SSL_METHOD *SSLv23_server_method(void);
extern SSL_METHOD *SSLv23_client_method(void);
extern int SSL_library_init(void);
extern void SSL_load_error_strings(void);
extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t);
extern void SSL_CTX_free(SSL_CTX *);
extern unsigned long ERR_get_error(void);
extern char *ERR_error_string(unsigned long, char *);
extern int CRYPTO_num_locks(void);
extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int));
extern void CRYPTO_set_id_callback(unsigned long (*)(void));
#else
// Dynamically loaded SSL functionality
struct ssl_func {
const char *name; // SSL function name
void (*ptr)(void); // Function pointer
};
#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[11].ptr)
#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[12].ptr)
#define SSL_CTX_set_default_passwd_cb \
(* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
#define SSL_CTX_use_certificate_chain_file \
(* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
#define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
#define CRYPTO_set_locking_callback \
(* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
#define CRYPTO_set_id_callback \
(* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
// set_ssl_option() function updates this array.
// It loads SSL library dynamically and changes NULLs to the actual addresses
// of respective functions. The macros above (like SSL_connect()) are really
// just calling these functions indirectly via the pointer.
static struct ssl_func ssl_sw[] = {
{"SSL_free", NULL},
{"SSL_accept", NULL},
{"SSL_connect", NULL},
{"SSL_read", NULL},
{"SSL_write", NULL},
{"SSL_get_error", NULL},
{"SSL_set_fd", NULL},
{"SSL_new", NULL},
{"SSL_CTX_new", NULL},
{"SSLv23_server_method", NULL},
{"SSL_library_init", NULL},
{"SSL_CTX_use_PrivateKey_file", NULL},
{"SSL_CTX_use_certificate_file",NULL},
{"SSL_CTX_set_default_passwd_cb",NULL},
{"SSL_CTX_free", NULL},
{"SSL_load_error_strings", NULL},
{"SSL_CTX_use_certificate_chain_file", NULL},
{"SSLv23_client_method", NULL},
{NULL, NULL}
};
// Similar array as ssl_sw. These functions could be located in different lib.
#if !defined(NO_SSL)
static struct ssl_func crypto_sw[] = {
{"CRYPTO_num_locks", NULL},
{"CRYPTO_set_locking_callback", NULL},
{"CRYPTO_set_id_callback", NULL},
{"ERR_get_error", NULL},
{"ERR_error_string", NULL},
{NULL, NULL}
};
#endif // NO_SSL
#endif // NO_SSL_DL
static const char *month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
// Unified socket address. For IPv6 support, add IPv6 address structure
// in the union u.
union usa {
struct sockaddr sa;
struct sockaddr_in sin;
#if defined(USE_IPV6)
struct sockaddr_in6 sin6;
#endif
};
// Describes a string (chunk of memory).
struct vec {
const char *ptr;
size_t len;
};
struct file {
int is_directory;
time_t modification_time;
int64_t size;
FILE *fp;
const char *membuf; // Non-NULL if file data is in memory
};
#define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL}
// Describes listening socket, or socket which was accept()-ed by the master
// thread and queued for future handling by the worker thread.
struct socket {
struct socket *next; // Linkage
SOCKET sock; // Listening socket
union usa lsa; // Local socket address
union usa rsa; // Remote socket address
int is_ssl; // Is socket SSL-ed
};
// NOTE(lsm): this enum shoulds be in sync with the config_options below.
enum {
CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES,
NUM_OPTIONS
};
static const char *config_options[] = {
"C", "cgi_pattern", "**.cgi$|**.pl$|**.php$",
"E", "cgi_environment", NULL,
"G", "put_delete_passwords_file", NULL,
"I", "cgi_interpreter", NULL,
"P", "protect_uri", NULL,
"R", "authentication_domain", "mydomain.com",
"S", "ssi_pattern", "**.shtml$|**.shtm$",
"T", "throttle", NULL,
"a", "access_log_file", NULL,
"d", "enable_directory_listing", "yes",
"e", "error_log_file", NULL,
"g", "global_passwords_file", NULL,
"i", "index_files", "index.html,index.htm,index.cgi,index.shtml,index.php",
"k", "enable_keep_alive", "no",
"l", "access_control_list", NULL,
"m", "extra_mime_types", NULL,
"p", "listening_ports", "8080",
"r", "document_root", ".",
"s", "ssl_certificate", NULL,
"t", "num_threads", "20",
"u", "run_as_user", NULL,
"w", "url_rewrite_patterns", NULL,
"x", "hide_files_patterns", NULL,
NULL
};
#define ENTRIES_PER_CONFIG_OPTION 3
struct mg_context {
volatile int stop_flag; // Should we stop event loop
SSL_CTX *ssl_ctx; // SSL context
SSL_CTX *client_ssl_ctx; // Client SSL context
char *config[NUM_OPTIONS]; // Mongoose configuration parameters
mg_callback_t user_callback; // User-defined callback function
void *user_data; // User-defined data
struct socket *listening_sockets;
volatile int num_threads; // Number of threads
pthread_mutex_t mutex; // Protects (max|num)_threads
pthread_cond_t cond; // Condvar for tracking workers terminations
struct socket queue[20]; // Accepted sockets
volatile int sq_head; // Head of the socket queue
volatile int sq_tail; // Tail of the socket queue
pthread_cond_t sq_full; // Signaled when socket is produced
pthread_cond_t sq_empty; // Signaled when socket is consumed
};
struct mg_connection {
struct mg_request_info request_info;
struct mg_context *ctx;
SSL *ssl; // SSL descriptor
struct socket client; // Connected client
time_t birth_time; // Time when request was received
int64_t num_bytes_sent; // Total bytes sent to client
int64_t content_len; // Content-Length header value
int64_t consumed_content; // How many bytes of content have been read
char *buf; // Buffer for received data
char *path_info; // PATH_INFO part of the URL
int must_close; // 1 if connection must be closed
int buf_size; // Buffer size
int request_len; // Size of the request + headers in a buffer
int data_len; // Total size of data in a buffer
int status_code; // HTTP reply status code, e.g. 200
int throttle; // Throttling, bytes/sec. <= 0 means no throttle
time_t last_throttle_time; // Last time throttled data was sent
int64_t last_throttle_bytes;// Bytes sent this second
};
const char **mg_get_valid_option_names(void) {
return config_options;
}
static void *call_user(struct mg_connection *conn, enum mg_event event) {
return conn == NULL || conn->ctx == NULL || conn->ctx->user_callback == NULL ?
NULL : conn->ctx->user_callback(event, conn);
}
static int is_file_in_memory(struct mg_connection *conn, const char *path,
struct file *filep) {
conn->request_info.ev_data = (void *) path;
if ((filep->membuf = call_user(conn, MG_OPEN_FILE)) != NULL) {
filep->size = (long) conn->request_info.ev_data;
}
return filep->membuf != NULL;
}
static int is_file_opened(const struct file *filep) {
return filep->membuf != NULL || filep->fp != NULL;
}
static int mg_fopen(struct mg_connection *conn, const char *path,
const char *mode, struct file *filep) {
if (!is_file_in_memory(conn, path, filep)) {
#ifdef _WIN32
wchar_t wbuf[PATH_MAX], wmode[20];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
filep->fp = _wfopen(wbuf, wmode);
#else
filep->fp = fopen(path, mode);
#endif
}
return is_file_opened(filep);
}
static void mg_fclose(struct file *filep) {
if (filep != NULL && filep->fp != NULL) {
fclose(filep->fp);
}
}
static int get_option_index(const char *name) {
int i;
for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
if (strcmp(config_options[i], name) == 0 ||
strcmp(config_options[i + 1], name) == 0) {
return i / ENTRIES_PER_CONFIG_OPTION;
}
}
return -1;
}
const char *mg_get_option(const struct mg_context *ctx, const char *name) {
int i;
if ((i = get_option_index(name)) == -1) {
return NULL;
} else if (ctx->config[i] == NULL) {
return "";
} else {
return ctx->config[i];
}
}
static void sockaddr_to_string(char *buf, size_t len,
const union usa *usa) {
buf[0] = '\0';
#if defined(USE_IPV6)
inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
(void *) &usa->sin.sin_addr :
(void *) &usa->sin6.sin6_addr, buf, len);
#elif defined(_WIN32)
// Only Windoze Vista (and newer) have inet_ntop()
strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
#else
inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
#endif
}
static void cry(struct mg_connection *conn,
PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
// Print error message to the opened error log stream.
static void cry(struct mg_connection *conn, const char *fmt, ...) {
char buf[MG_BUF_LEN], src_addr[20];
va_list ap;
FILE *fp;
time_t timestamp;
va_start(ap, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
// Do not lock when getting the callback value, here and below.
// I suppose this is fine, since function cannot disappear in the
// same way string option can.
conn->request_info.ev_data = buf;
if (call_user(conn, MG_EVENT_LOG) == NULL) {
fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
if (fp != NULL) {
flockfile(fp);
timestamp = time(NULL);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
src_addr);
if (conn->request_info.request_method != NULL) {
fprintf(fp, "%s %s: ", conn->request_info.request_method,
conn->request_info.uri);
}
fprintf(fp, "%s", buf);
fputc('\n', fp);
funlockfile(fp);
fclose(fp);
}
}
conn->request_info.ev_data = NULL;
}
// Return fake connection structure. Used for logging, if connection
// is not applicable at the moment of logging.
static struct mg_connection *fc(struct mg_context *ctx) {
static struct mg_connection fake_connection;
fake_connection.ctx = ctx;
return &fake_connection;
}
const char *mg_version(void) {
return MONGOOSE_VERSION;
}
struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
return &conn->request_info;
}
static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
for (; *src != '\0' && n > 1; n--) {
*dst++ = *src++;
}
*dst = '\0';
}
static int lowercase(const char *s) {
return tolower(* (const unsigned char *) s);
}
static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
int diff = 0;
if (len > 0)
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0' && --len > 0);
return diff;
}
static int mg_strcasecmp(const char *s1, const char *s2) {
int diff;
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0');
return diff;
}
static char * mg_strndup(const char *ptr, size_t len) {
char *p;
if ((p = (char *) malloc(len + 1)) != NULL) {
mg_strlcpy(p, ptr, len + 1);
}
return p;
}
static char * mg_strdup(const char *str) {
return mg_strndup(str, strlen(str));
}
// Like snprintf(), but never returns negative value, or a value
// that is larger than a supplied buffer.
// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
// in his audit report.
static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
const char *fmt, va_list ap) {
int n;
if (buflen == 0)
return 0;
n = vsnprintf(buf, buflen, fmt, ap);
if (n < 0) {
cry(conn, "vsnprintf error");
n = 0;
} else if (n >= (int) buflen) {
cry(conn, "truncating vsnprintf buffer: [%.*s]",
n > 200 ? 200 : n, buf);
n = (int) buflen - 1;
}
buf[n] = '\0';
return n;
}
static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(4, 5);
static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
const char *fmt, ...) {
va_list ap;
int n;
va_start(ap, fmt);
n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
va_end(ap);
return n;
}
// Skip the characters until one of the delimiters characters found.
// 0-terminate resulting word. Skip the delimiter and following whitespaces if any.
// Advance pointer to buffer to the next word. Return found 0-terminated word.
// Delimiters can be quoted with quotechar.
static char *skip_quoted(char **buf, const char *delimiters,
const char *whitespace, char quotechar) {
char *p, *begin_word, *end_word, *end_whitespace;
begin_word = *buf;
end_word = begin_word + strcspn(begin_word, delimiters);
// Check for quotechar
if (end_word > begin_word) {
p = end_word - 1;
while (*p == quotechar) {
// If there is anything beyond end_word, copy it
if (*end_word == '\0') {
*p = '\0';
break;
} else {
size_t end_off = strcspn(end_word + 1, delimiters);
memmove (p, end_word, end_off + 1);
p += end_off; // p must correspond to end_word - 1
end_word += end_off + 1;
}
}
for (p++; p < end_word; p++) {
*p = '\0';
}
}
if (*end_word == '\0') {
*buf = end_word;
} else {
end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
for (p = end_word; p < end_whitespace; p++) {
*p = '\0';
}
*buf = end_whitespace;
}
return begin_word;
}
// Simplified version of skip_quoted without quote char
// and whitespace == delimiters
static char *skip(char **buf, const char *delimiters) {
return skip_quoted(buf, delimiters, delimiters, 0);
}
// Return HTTP header value, or NULL if not found.
static const char *get_header(const struct mg_request_info *ri,
const char *name) {
int i;
for (i = 0; i < ri->num_headers; i++)
if (!mg_strcasecmp(name, ri->http_headers[i].name))
return ri->http_headers[i].value;
return NULL;
}
const char *mg_get_header(const struct mg_connection *conn, const char *name) {
return get_header(&conn->request_info, name);
}
// A helper function for traversing a comma separated list of values.
// It returns a list pointer shifted to the next value, or NULL if the end
// of the list found.
// Value is stored in val vector. If value has form "x=y", then eq_val
// vector is initialized to point to the "y" part, and val vector length
// is adjusted to point only to "x".
static const char *next_option(const char *list, struct vec *val,
struct vec *eq_val) {
if (list == NULL || *list == '\0') {
// End of the list
list = NULL;
} else {
val->ptr = list;
if ((list = strchr(val->ptr, ',')) != NULL) {
// Comma found. Store length and shift the list ptr
val->len = list - val->ptr;
list++;
} else {
// This value is the last one
list = val->ptr + strlen(val->ptr);
val->len = list - val->ptr;
}
if (eq_val != NULL) {
// Value has form "x=y", adjust pointers and lengths
// so that val points to "x", and eq_val points to "y".
eq_val->len = 0;
eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
if (eq_val->ptr != NULL) {
eq_val->ptr++; // Skip over '=' character
eq_val->len = val->ptr + val->len - eq_val->ptr;
val->len = (eq_val->ptr - val->ptr) - 1;
}
}
}
return list;
}
static int match_prefix(const char *pattern, int pattern_len, const char *str) {
const char *or_str;
int i, j, len, res;
if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
res = match_prefix(pattern, or_str - pattern, str);
return res > 0 ? res :
match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
}
i = j = 0;
res = -1;
for (; i < pattern_len; i++, j++) {
if (pattern[i] == '?' && str[j] != '\0') {
continue;
} else if (pattern[i] == '$') {
return str[j] == '\0' ? j : -1;
} else if (pattern[i] == '*') {
i++;
if (pattern[i] == '*') {
i++;
len = (int) strlen(str + j);
} else {
len = (int) strcspn(str + j, "/");
}
if (i == pattern_len) {
return j + len;
}
do {
res = match_prefix(pattern + i, pattern_len - i, str + j + len);
} while (res == -1 && len-- > 0);
return res == -1 ? -1 : j + res + len;
} else if (pattern[i] != str[j]) {
return -1;
}
}
return j;
}
// HTTP 1.1 assumes keep alive if "Connection:" header is not set
// This function must tolerate situations when connection info is not
// set up, for example if request parsing failed.
static int should_keep_alive(const struct mg_connection *conn) {
const char *http_version = conn->request_info.http_version;
const char *header = mg_get_header(conn, "Connection");
if (conn->must_close ||
conn->status_code == 401 ||
mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
(header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
(header == NULL && http_version && strcmp(http_version, "1.1"))) {
return 0;
}
return 1;
}
static const char *suggest_connection_header(const struct mg_connection *conn) {
return should_keep_alive(conn) ? "keep-alive" : "close";
}
static void send_http_error(struct mg_connection *, int, const char *,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(4, 5);
static void send_http_error(struct mg_connection *conn, int status,
const char *reason, const char *fmt, ...) {
char buf[MG_BUF_LEN];
va_list ap;
int len;
conn->status_code = status;
conn->request_info.ev_data = (void *) (long) status;
if (call_user(conn, MG_HTTP_ERROR) == NULL) {
buf[0] = '\0';
len = 0;
// Errors 1xx, 204 and 304 MUST NOT send a body
if (status > 199 && status != 204 && status != 304) {
len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
buf[len++] = '\n';
va_start(ap, fmt);
len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
va_end(ap);
}
DEBUG_TRACE(("[%s]", buf));
mg_printf(conn, "HTTP/1.1 %d %s\r\n"
"Content-Length: %d\r\n"
"Connection: %s\r\n\r\n", status, reason, len,
suggest_connection_header(conn));
conn->num_bytes_sent += mg_printf(conn, "%s", buf);
}
}
#if defined(_WIN32) && !defined(__SYMBIAN32__)
static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
unused = NULL;
*mutex = CreateMutex(NULL, FALSE, NULL);
return *mutex == NULL ? -1 : 0;
}
static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
return CloseHandle(*mutex) == 0 ? -1 : 0;
}
static int pthread_mutex_lock(pthread_mutex_t *mutex) {
return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}
static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
return ReleaseMutex(*mutex) == 0 ? -1 : 0;
}
static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
unused = NULL;
cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
}
static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
HANDLE handles[] = {cv->signal, cv->broadcast};
ReleaseMutex(*mutex);
WaitForMultipleObjects(2, handles, FALSE, INFINITE);
return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}
static int pthread_cond_signal(pthread_cond_t *cv) {
return SetEvent(cv->signal) == 0 ? -1 : 0;
}
static int pthread_cond_broadcast(pthread_cond_t *cv) {
// Implementation with PulseEvent() has race condition, see
// http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
}
static int pthread_cond_destroy(pthread_cond_t *cv) {
return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
}
// For Windows, change all slashes to backslashes in path names.
static void change_slashes_to_backslashes(char *path) {
int i;
for (i = 0; path[i] != '\0'; i++) {
if (path[i] == '/')
path[i] = '\\';
// i > 0 check is to preserve UNC paths, like \\server\file.txt
if (path[i] == '\\' && i > 0)
while (path[i + 1] == '\\' || path[i + 1] == '/')
(void) memmove(path + i + 1,
path + i + 2, strlen(path + i + 1));
}
}
// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
// wbuf and wbuf_len is a target buffer and its length.
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
char buf[PATH_MAX], buf2[PATH_MAX], *p;
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
// Point p to the end of the file name
p = buf + strlen(buf) - 1;
// Trim trailing backslash character
while (p > buf && *p == '\\' && p[-1] != ':') {
*p-- = '\0';
}
// Protect from CGI code disclosure.
// This is very nasty hole. Windows happily opens files with
// some garbage in the end of file name. So fopen("a.cgi ", "r")
// actually opens "a.cgi", and does not return an error!
if (*p == 0x20 || // No space at the end
(*p == 0x2e && p > buf) || // No '.' but allow '.' as full path
*p == 0x2b || // No '+'
(*p & ~0x7f)) { // And generally no non-ASCII chars
(void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
wbuf[0] = L'\0';
} else {
// Convert to Unicode and back. If doubly-converted string does not
// match the original, something is fishy, reject.
memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
NULL, NULL);
if (strcmp(buf, buf2) != 0) {
wbuf[0] = L'\0';
}
}
}
#if defined(_WIN32_WCE)
static time_t time(time_t *ptime) {
time_t t;
SYSTEMTIME st;
FILETIME ft;
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
if (ptime != NULL) {
*ptime = t;
}
return t;
}
static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
FILETIME ft, lft;
SYSTEMTIME st;
TIME_ZONE_INFORMATION tzinfo;
if (ptm == NULL) {
return NULL;
}
* (int64_t *) &ft = t;
FileTimeToLocalFileTime(&ft, &lft);
FileTimeToSystemTime(&lft, &st);
ptm->tm_year = st.wYear - 1900;
ptm->tm_mon = st.wMonth - 1;
ptm->tm_wday = st.wDayOfWeek;
ptm->tm_mday = st.wDay;
ptm->tm_hour = st.wHour;
ptm->tm_min = st.wMinute;
ptm->tm_sec = st.wSecond;
ptm->tm_yday = 0; // hope nobody uses this
ptm->tm_isdst =
GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
return ptm;
}
static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
// FIXME(lsm): fix this.
return localtime(ptime, ptm);
}
static size_t strftime(char *dst, size_t dst_size, const char *fmt,
const struct tm *tm) {
(void) snprintf(dst, dst_size, "implement strftime() for WinCE");
return 0;
}
#endif
static int mg_rename(const char* oldname, const char* newname) {
wchar_t woldbuf[PATH_MAX];
wchar_t wnewbuf[PATH_MAX];
to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
}
static int mg_stat(struct mg_connection *conn, const char *path,
struct file *filep) {
wchar_t wbuf[PATH_MAX];
WIN32_FILE_ATTRIBUTE_DATA info;
if (!is_file_in_memory(conn, path, filep)) {
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
filep->modification_time = SYS2UNIX_TIME(
info.ftLastWriteTime.dwLowDateTime,
info.ftLastWriteTime.dwHighDateTime);
filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
}
}
return filep->membuf != NULL || filep->modification_time != 0;
}
static int mg_remove(const char *path) {
wchar_t wbuf[PATH_MAX];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
return DeleteFileW(wbuf) ? 0 : -1;
}
static int mg_mkdir(const char *path, int mode) {
char buf[PATH_MAX];
wchar_t wbuf[PATH_MAX];
mode = 0; // Unused
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));
return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
}
// Implementation of POSIX opendir/closedir/readdir for Windows.
static DIR * opendir(const char *name) {
DIR *dir = NULL;
wchar_t wpath[PATH_MAX];
DWORD attrs;
if (name == NULL) {
SetLastError(ERROR_BAD_ARGUMENTS);
} else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
} else {
to_unicode(name, wpath, ARRAY_SIZE(wpath));
attrs = GetFileAttributesW(wpath);
if (attrs != 0xFFFFFFFF &&
((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
(void) wcscat(wpath, L"\\*");
dir->handle = FindFirstFileW(wpath, &dir->info);
dir->result.d_name[0] = '\0';
} else {
free(dir);
dir = NULL;
}
}
return dir;
}
static int closedir(DIR *dir) {
int result = 0;
if (dir != NULL) {
if (dir->handle != INVALID_HANDLE_VALUE)
result = FindClose(dir->handle) ? 0 : -1;
free(dir);
} else {
result = -1;
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
static struct dirent *readdir(DIR *dir) {
struct dirent *result = 0;
if (dir) {
if (dir->handle != INVALID_HANDLE_VALUE) {
result = &dir->result;
(void) WideCharToMultiByte(CP_UTF8, 0,
dir->info.cFileName, -1, result->d_name,
sizeof(result->d_name), NULL, NULL);
if (!FindNextFileW(dir->handle, &dir->info)) {
(void) FindClose(dir->handle);
dir->handle = INVALID_HANDLE_VALUE;
}
} else {
SetLastError(ERROR_FILE_NOT_FOUND);
}
} else {
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
#define set_close_on_exec(x) // No FD_CLOEXEC on Windows
int mg_start_thread(mg_thread_func_t f, void *p) {
return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
}
static HANDLE dlopen(const char *dll_name, int flags) {
wchar_t wbuf[PATH_MAX];
flags = 0; // Unused
to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
return LoadLibraryW(wbuf);
}
#if !defined(NO_CGI)
#define SIGKILL 0
static int kill(pid_t pid, int sig_num) {
(void) TerminateProcess(pid, sig_num);
(void) CloseHandle(pid);
return 0;
}
static pid_t spawn_process(struct mg_connection *conn, const char *prog,
char *envblk, char *envp[], int fd_stdin,
int fd_stdout, const char *dir) {
HANDLE me;
char *p, *interp, full_interp[PATH_MAX], cmdline[PATH_MAX], buf[PATH_MAX];
struct file file;
STARTUPINFOA si = { sizeof(si) };
PROCESS_INFORMATION pi = { 0 };
envp = NULL; // Unused
// TODO(lsm): redirect CGI errors to the error log file
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
me = GetCurrentProcess();
DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
&si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
&si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
// If CGI file is a script, try to read the interpreter line
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
buf[0] = buf[1] = '\0';
// Read the first line of the script into the buffer
snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
if (mg_fopen(conn, cmdline, "r", &file)) {
p = (char *) file.membuf;
mg_fgets(buf, sizeof(buf), &file, &p);
mg_fclose(&file);
buf[sizeof(buf) - 1] = '\0';
}
if (buf[0] == '#' && buf[1] == '!') {
// Trim whitespace in interpreter name
for (p = buf + 2; *p != '\0' && isspace(* (unsigned char *) p); )
p++;
*p = '\0';
} else {
buf[2] = '\0';
}
interp = buf + 2;
}
if (interp[0] != '\0') {
GetFullPathName(interp, sizeof(full_interp), full_interp, NULL);
interp = full_interp;
}
mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s",
interp, interp[0] == '\0' ? "" : " ", prog);
DEBUG_TRACE(("Running [%s]", cmdline));
if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) {
cry(conn, "%s: CreateProcess(%s): %d",
__func__, cmdline, ERRNO);
pi.hProcess = (pid_t) -1;
}
// Always close these to prevent handle leakage.
(void) close(fd_stdin);
(void) close(fd_stdout);
(void) CloseHandle(si.hStdOutput);
(void) CloseHandle(si.hStdInput);
(void) CloseHandle(pi.hThread);
return (pid_t) pi.hProcess;
}
#endif // !NO_CGI
static int set_non_blocking_mode(SOCKET sock) {
unsigned long on = 1;
return ioctlsocket(sock, FIONBIO, &on);
}
#else
static int mg_stat(struct mg_connection *conn, const char *path,
struct file *filep) {
struct stat st;
if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
filep->size = st.st_size;
filep->modification_time = st.st_mtime;
filep->is_directory = S_ISDIR(st.st_mode);
}
return filep->membuf != NULL || filep->modification_time != (time_t) 0;
}
static void set_close_on_exec(int fd) {
fcntl(fd, F_SETFD, FD_CLOEXEC);
}
int mg_start_thread(mg_thread_func_t func, void *param) {
pthread_t thread_id;
pthread_attr_t attr;
(void) pthread_attr_init(&attr);
(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
// TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
// (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
return pthread_create(&thread_id, &attr, func, param);
}
#ifndef NO_CGI
static pid_t spawn_process(struct mg_connection *conn, const char *prog,
char *envblk, char *envp[], int fd_stdin,
int fd_stdout, const char *dir) {
pid_t pid;
const char *interp;
envblk = NULL; // Unused
if ((pid = fork()) == -1) {
// Parent
send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
} else if (pid == 0) {
// Child
if (chdir(dir) != 0) {
cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
} else if (dup2(fd_stdin, 0) == -1) {
cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
} else if (dup2(fd_stdout, 1) == -1) {
cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
} else {
(void) dup2(fd_stdout, 2);
(void) close(fd_stdin);
(void) close(fd_stdout);
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
(void) execle(prog, prog, NULL, envp);
cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
} else {
(void) execle(interp, interp, prog, NULL, envp);
cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
strerror(ERRNO));
}
}
exit(EXIT_FAILURE);
}
// Parent. Close stdio descriptors
(void) close(fd_stdin);
(void) close(fd_stdout);
return pid;
}
#endif // !NO_CGI
static int set_non_blocking_mode(SOCKET sock) {
int flags;
flags = fcntl(sock, F_GETFL, 0);
(void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
return 0;
}
#endif // _WIN32
// Write data to the IO channel - opened file descriptor, socket or SSL
// descriptor. Return number of bytes written.
static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
int64_t len) {
int64_t sent;
int n, k;
sent = 0;
while (sent < len) {
// How many bytes we send in this iteration
k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
if (ssl != NULL) {
n = SSL_write(ssl, buf + sent, k);
} else if (fp != NULL) {
n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
if (ferror(fp))
n = -1;
} else {
n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
}
if (n < 0)
break;
sent += n;
}
return sent;
}
// This function is needed to prevent Mongoose to be stuck in a blocking
// socket read when user requested exit. To do that, we sleep in select
// with a timeout, and when returned, check the context for the stop flag.
// If it is set, we return 0, and this means that we must not continue
// reading, must give up and close the connection and exit serving thread.
static int wait_until_socket_is_readable(struct mg_connection *conn) {
int result;
struct timeval tv;
fd_set set;
do {
tv.tv_sec = 0;
tv.tv_usec = 300 * 1000;
FD_ZERO(&set);
FD_SET(conn->client.sock, &set);
result = select(conn->client.sock + 1, &set, NULL, NULL, &tv);
} while ((result == 0 || (result < 0 && ERRNO == EINTR)) &&
conn->ctx->stop_flag == 0);
return conn->ctx->stop_flag || result < 0 ? 0 : 1;
}
// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
// Return negative value on error, or number of bytes read on success.
static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
int nread;
if (fp != NULL) {
// Use read() instead of fread(), because if we're reading from the CGI
// pipe, fread() may block until IO buffer is filled up. We cannot afford
// to block and must pass all read bytes immediately to the client.
nread = read(fileno(fp), buf, (size_t) len);
} else if (!wait_until_socket_is_readable(conn)) {
nread = -1;
} else if (conn->ssl != NULL) {
nread = SSL_read(conn->ssl, buf, len);
} else {
nread = recv(conn->client.sock, buf, (size_t) len, 0);
}
return conn->ctx->stop_flag ? -1 : nread;
}
int mg_read(struct mg_connection *conn, void *buf, size_t len) {
int n, buffered_len, nread;
const char *body;
nread = 0;
if (conn->consumed_content < conn->content_len) {
// Adjust number of bytes to read.
int64_t to_read = conn->content_len - conn->consumed_content;
if (to_read < (int64_t) len) {
len = (size_t) to_read;
}
// Return buffered data
body = conn->buf + conn->request_len + conn->consumed_content;
buffered_len = &conn->buf[conn->data_len] - body;
if (buffered_len > 0) {
if (len < (size_t) buffered_len) {
buffered_len = (int) len;
}
memcpy(buf, body, (size_t) buffered_len);
len -= buffered_len;
conn->consumed_content += buffered_len;
nread += buffered_len;
buf = (char *) buf + buffered_len;
}
// We have returned all buffered data. Read new data from the remote socket.
while (len > 0) {
n = pull(NULL, conn, (char *) buf, (int) len);
if (n < 0) {
nread = n; // Propagate the error
break;
} else if (n == 0) {
break; // No more data to read
} else {
buf = (char *) buf + n;
conn->consumed_content += n;
nread += n;
len -= n;
}
}
}
return nread;
}
int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
time_t now;
int64_t n, total, allowed;
if (conn->throttle > 0) {
if ((now = time(NULL)) != conn->last_throttle_time) {
conn->last_throttle_time = now;
conn->last_throttle_bytes = 0;
}
allowed = conn->throttle - conn->last_throttle_bytes;
if (allowed > (int64_t) len) {
allowed = len;
}
if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) == allowed) {
buf = (char *) buf + total;
conn->last_throttle_bytes += total;
while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
allowed = conn->throttle > (int64_t) len - total ?
(int64_t) len - total : conn->throttle;
if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) != allowed) {
break;
}
sleep(1);
conn->last_throttle_bytes = allowed;
conn->last_throttle_time = time(NULL);
buf = (char *) buf + n;
total += n;
}
}
} else {
total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) len);
}
return (int) total;
}
int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
char mem[MG_BUF_LEN], *buf = mem;
int len;
va_list ap;
// Print in a local buffer first, hoping that it is large enough to
// hold the whole message
va_start(ap, fmt);
len = vsnprintf(mem, sizeof(mem), fmt, ap);
va_end(ap);
if (len == 0) {
// Do nothing. mg_printf(conn, "%s", "") was called.
} else if (len < 0) {
// vsnprintf() error, give up
len = -1;
cry(conn, "%s(%s, ...): vsnprintf() error", __func__, fmt);
} else if (len > (int) sizeof(mem) && (buf = (char *) malloc(len + 1)) != NULL) {
// Local buffer is not large enough, allocate big buffer on heap
va_start(ap, fmt);
vsnprintf(buf, len + 1, fmt, ap);
va_end(ap);
len = mg_write(conn, buf, (size_t) len);
free(buf);
} else if (len > (int) sizeof(mem)) {
// Failed to allocate large enough buffer, give up
cry(conn, "%s(%s, ...): Can't allocate %d bytes, not printing anything",
__func__, fmt, len);
len = -1;
} else {
// Copy to the local buffer succeeded
len = mg_write(conn, buf, (size_t) len);
}
return len;
}
// URL-decode input buffer into destination buffer.
// 0-terminate the destination buffer. Return the length of decoded data.
// form-url-encoded data differs from URI encoding in a way that it
// uses '+' as character for space, see RFC 1866 section 8.2.1
// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
static size_t url_decode(const char *src, size_t src_len, char *dst,
size_t dst_len, int is_form_url_encoded) {
size_t i, j;
int a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
if (src[i] == '%' &&
isxdigit(* (const unsigned char *) (src + i + 1)) &&
isxdigit(* (const unsigned char *) (src + i + 2))) {
a = tolower(* (const unsigned char *) (src + i + 1));
b = tolower(* (const unsigned char *) (src + i + 2));
dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
i += 2;
} else if (is_form_url_encoded && src[i] == '+') {
dst[j] = ' ';
} else {
dst[j] = src[i];
}
}
dst[j] = '\0'; // Null-terminate the destination
return j;
}
// Scan given buffer and fetch the value of the given variable.
// It can be specified in query string, or in the POST data.
// Return -1 if the variable not found, or length of the URL-decoded value
// stored in dst. The dst buffer is guaranteed to be NUL-terminated if it
// is not NULL or zero-length. If dst is NULL or zero-length, then
// -2 is returned.
int mg_get_var(const char *buf, size_t buf_len, const char *name,
char *dst, size_t dst_len) {
const char *p, *e, *s;
size_t name_len;
int len;
if (dst == NULL || dst_len == 0) {
len = -2;
} else if (buf == NULL || name == NULL || buf_len == 0) {
len = -1;
dst[0] = '\0';
} else {
name_len = strlen(name);
e = buf + buf_len;
len = -1;
dst[0] = '\0';
// buf is "var1=val1&var2=val2...". Find variable first
for (p = buf; p + name_len < e; p++) {
if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
!mg_strncasecmp(name, p, name_len)) {
// Point p to variable value
p += name_len + 1;
// Point s to the end of the value
s = (const char *) memchr(p, '&', (size_t)(e - p));
if (s == NULL) {
s = e;
}
assert(s >= p);
// Decode variable into destination buffer
if ((size_t) (s - p) < dst_len) {
len = (int) url_decode(p, (size_t)(s - p), dst, dst_len, 1);
}
break;
}
}
}
return len;
}
int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
char *dst, size_t dst_size) {
const char *s, *p, *end;
int name_len, len = -1;
dst[0] = '\0';
if ((s = mg_get_header(conn, "Cookie")) == NULL) {
return -1;
}
name_len = (int) strlen(cookie_name);
end = s + strlen(s);
for (; (s = strstr(s, cookie_name)) != NULL; s += name_len)
if (s[name_len] == '=') {
s += name_len + 1;
if ((p = strchr(s, ' ')) == NULL)
p = end;
if (p[-1] == ';')
p--;
if (*s == '"' && p[-1] == '"' && p > s + 1) {
s++;
p--;
}
if ((size_t) (p - s) < dst_size) {
len = p - s;
mg_strlcpy(dst, s, (size_t) len + 1);
}
break;
}
return len;
}
static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
size_t buf_len, struct file *filep) {
struct vec a, b;
const char *rewrite, *uri = conn->request_info.uri;
char *p;
int match_len;
// Using buf_len - 1 because memmove() for PATH_INFO may shift part
// of the path one byte on the right.
mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
uri);
rewrite = conn->ctx->config[REWRITE];
while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
uri + match_len);
break;
}
}
if (!mg_stat(conn, buf, filep)) {
// Support PATH_INFO for CGI scripts.
for (p = buf + strlen(buf); p > buf + 1; p--) {
if (*p == '/') {
*p = '\0';
if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
mg_stat(conn, buf, filep)) {
// Shift PATH_INFO block one character right, e.g.
// "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
// conn->path_info is pointing to the local variable "path" declared
// in handle_request(), so PATH_INFO is not valid after
// handle_request returns.
conn->path_info = p + 1;
memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
p[1] = '/';
break;
} else {
*p = '/';
}
}
}
}
}
static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
return (conn->ssl = SSL_new(s)) != NULL &&
SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
func(conn->ssl) == 1;
}
// Check whether full request is buffered. Return:
// -1 if request is malformed
// 0 if request is not yet fully buffered
// >0 actual request length, including last \r\n\r\n
static int get_request_len(const char *buf, int buflen) {
const char *s, *e;
int len = 0;
for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
// Control characters are not allowed but >=128 is.
if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
*s != '\n' && * (const unsigned char *) s < 128) {
len = -1;
break; // [i_a] abort scan as soon as one malformed character is found; don't let subsequent \r\n\r\n win us over anyhow
} else if (s[0] == '\n' && s[1] == '\n') {
len = (int) (s - buf) + 2;
} else if (s[0] == '\n' && &s[1] < e &&
s[1] == '\r' && s[2] == '\n') {
len = (int) (s - buf) + 3;
}
return len;
}
// Convert month to the month number. Return -1 on error, or month number
static int get_month_index(const char *s) {
size_t i;
for (i = 0; i < ARRAY_SIZE(month_names); i++)
if (!strcmp(s, month_names[i]))
return (int) i;
return -1;
}
static int num_leap_years(int year) {
return year / 4 - year / 100 + year / 400;
}
// Parse UTC date-time string, and return the corresponding time_t value.
static time_t parse_date_string(const char *datetime) {
static const unsigned short days_before_month[] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
char month_str[32];
int second, minute, hour, day, month, year, leap_days, days;
time_t result = (time_t) 0;
if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%d %3s %d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%d-%3s-%d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6)) &&
year > 1970 &&
(month = get_month_index(month_str)) != -1) {
leap_days = num_leap_years(year) - num_leap_years(1970);
year -= 1970;
days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
}
return result;
}
// Protect against directory disclosure attack by removing '..',
// excessive '/' and '\' characters
static void remove_double_dots_and_double_slashes(char *s) {
char *p = s;
while (*s != '\0') {
*p++ = *s++;
if (s[-1] == '/' || s[-1] == '\\') {
// Skip all following slashes, backslashes and double-dots
while (s[0] != '\0') {
if (s[0] == '/' || s[0] == '\\') {
s++;
} else if (s[0] == '.' && s[1] == '.') {
s += 2;
} else {
break;
}
}
}
}
*p = '\0';
}
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} builtin_mime_types[] = {
{".html", 5, "text/html"},
{".htm", 4, "text/html"},
{".shtm", 5, "text/html"},
{".shtml", 6, "text/html"},
{".css", 4, "text/css"},
{".js", 3, "application/x-javascript"},
{".ico", 4, "image/x-icon"},
{".gif", 4, "image/gif"},
{".jpg", 4, "image/jpeg"},
{".jpeg", 5, "image/jpeg"},
{".png", 4, "image/png"},
{".svg", 4, "image/svg+xml"},
{".txt", 4, "text/plain"},
{".torrent", 8, "application/x-bittorrent"},
{".wav", 4, "audio/x-wav"},
{".mp3", 4, "audio/x-mp3"},
{".mid", 4, "audio/mid"},
{".m3u", 4, "audio/x-mpegurl"},
{".ram", 4, "audio/x-pn-realaudio"},
{".xml", 4, "text/xml"},
{".json", 5, "text/json"},
{".xslt", 5, "application/xml"},
{".ra", 3, "audio/x-pn-realaudio"},
{".doc", 4, "application/msword"},
{".exe", 4, "application/octet-stream"},
{".zip", 4, "application/x-zip-compressed"},
{".xls", 4, "application/excel"},
{".tgz", 4, "application/x-tar-gz"},
{".tar", 4, "application/x-tar"},
{".gz", 3, "application/x-gunzip"},
{".arj", 4, "application/x-arj-compressed"},
{".rar", 4, "application/x-arj-compressed"},
{".rtf", 4, "application/rtf"},
{".pdf", 4, "application/pdf"},
{".swf", 4, "application/x-shockwave-flash"},
{".mpg", 4, "video/mpeg"},
{".webm", 5, "video/webm"},
{".mpeg", 5, "video/mpeg"},
{".mp4", 4, "video/mp4"},
{".m4v", 4, "video/x-m4v"},
{".asf", 4, "video/x-ms-asf"},
{".avi", 4, "video/x-msvideo"},
{".bmp", 4, "image/bmp"},
{NULL, 0, NULL}
};
const char *mg_get_builtin_mime_type(const char *path) {
const char *ext;
size_t i, path_len;
path_len = strlen(path);
for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - builtin_mime_types[i].ext_len);
if (path_len > builtin_mime_types[i].ext_len &&
mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
return builtin_mime_types[i].mime_type;
}
}
return "text/plain";
}
// Look at the "path" extension and figure what mime type it has.
// Store mime type in the vector.
static void get_mime_type(struct mg_context *ctx, const char *path,
struct vec *vec) {
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t path_len;
path_len = strlen(path);
// Scan user-defined mime types first, in case user wants to
// override default mime types.
list = ctx->config[EXTRA_MIME_TYPES];
while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
// ext now points to the path suffix
ext = path + path_len - ext_vec.len;
if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
*vec = mime_vec;
return;
}
}
vec->ptr = mg_get_builtin_mime_type(path);
vec->len = strlen(vec->ptr);
}
#ifndef HAVE_MD5
typedef struct MD5Context {
uint32_t buf[4];
uint32_t bits[2];
unsigned char in[64];
} MD5_CTX;
#if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234)
#define byteReverse(buf, len) // Do nothing
#else
static void byteReverse(unsigned char *buf, unsigned longs) {
uint32_t t;
do {
t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
*(uint32_t *) buf = t;
buf += 4;
} while (--longs);
}
#endif
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
// initialization constants.
static void MD5Init(MD5_CTX *ctx) {
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
register uint32_t a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
uint32_t t;
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
ctx->bits[1]++;
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f;
if (t) {
unsigned char *p = (unsigned char *) ctx->in + t;
t = 64 - t;
if (len < t) {
memcpy(p, buf, len);
return;
}
memcpy(p, buf, t);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += t;
len -= t;
}
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += 64;
len -= 64;
}
memcpy(ctx->in, buf, len);
}
static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
unsigned count;
unsigned char *p;
count = (ctx->bits[0] >> 3) & 0x3F;
p = ctx->in + count;
*p++ = 0x80;
count = 64 - 1 - count;
if (count < 8) {
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
memset(ctx->in, 0, 56);
} else {
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
((uint32_t *) ctx->in)[14] = ctx->bits[0];
((uint32_t *) ctx->in)[15] = ctx->bits[1];
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
byteReverse((unsigned char *) ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
memset((char *) ctx, 0, sizeof(*ctx));
}
#endif // !HAVE_MD5
// Stringify binary data. Output buffer must be twice as big as input,
// because each byte takes 2 bytes in string representation
static void bin2str(char *to, const unsigned char *p, size_t len) {
static const char *hex = "0123456789abcdef";
for (; len--; p++) {
*to++ = hex[p[0] >> 4];
*to++ = hex[p[0] & 0x0f];
}
*to = '\0';
}
// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
void mg_md5(char buf[33], ...) {
unsigned char hash[16];
const char *p;
va_list ap;
MD5_CTX ctx;
MD5Init(&ctx);
va_start(ap, buf);
while ((p = va_arg(ap, const char *)) != NULL) {
MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
}
va_end(ap);
MD5Final(hash, &ctx);
bin2str(buf, hash, sizeof(hash));
}
// Check the user's password, return 1 if OK
static int check_password(const char *method, const char *ha1, const char *uri,
const char *nonce, const char *nc, const char *cnonce,
const char *qop, const char *response) {
char ha2[32 + 1], expected_response[32 + 1];
// Some of the parameters may be NULL
if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
qop == NULL || response == NULL) {
return 0;
}
// NOTE(lsm): due to a bug in MSIE, we do not compare the URI
// TODO(lsm): check for authentication timeout
if (// strcmp(dig->uri, c->ouri) != 0 ||
strlen(response) != 32
// || now - strtoul(dig->nonce, NULL, 10) > 3600
) {
return 0;
}
mg_md5(ha2, method, ":", uri, NULL);
mg_md5(expected_response, ha1, ":", nonce, ":", nc,
":", cnonce, ":", qop, ":", ha2, NULL);
return mg_strcasecmp(response, expected_response) == 0;
}
// Use the global passwords file, if specified by auth_gpass option,
// or search for .htpasswd in the requested directory.
static void open_auth_file(struct mg_connection *conn, const char *path,
struct file *filep) {
char name[PATH_MAX];
const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
if (gpass != NULL) {
// Use global passwords file
if (!mg_fopen(conn, gpass, "r", filep)) {
cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
}
} else if (mg_stat(conn, path, filep) && filep->is_directory) {
mg_snprintf(conn, name, sizeof(name), "%s%c%s",
path, '/', PASSWORDS_FILE_NAME);
mg_fopen(conn, name, "r", filep);
} else {
// Try to find .htpasswd in requested directory.
for (p = path, e = p + strlen(p) - 1; e > p; e--)
if (e[0] == '/')
break;
mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
(int) (e - p), p, '/', PASSWORDS_FILE_NAME);
mg_fopen(conn, name, "r", filep);
}
}
// Parsed Authorization header
struct ah {
char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
};
// Return 1 on success. Always initializes the ah structure.
static int parse_auth_header(struct mg_connection *conn, char *buf,
size_t buf_size, struct ah *ah) {
char *name, *value, *s;
const char *auth_header;
(void) memset(ah, 0, sizeof(*ah));
if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
return 0;
}
// Make modifiable copy of the auth header
(void) mg_strlcpy(buf, auth_header + 7, buf_size);
s = buf;
// Parse authorization header
for (;;) {
// Gobble initial spaces
while (isspace(* (unsigned char *) s)) {
s++;
}
name = skip_quoted(&s, "=", " ", 0);
// Value is either quote-delimited, or ends at first comma or space.
if (s[0] == '\"') {
s++;
value = skip_quoted(&s, "\"", " ", '\\');
if (s[0] == ',') {
s++;
}
} else {
value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
}
if (*name == '\0') {
break;
}
if (!strcmp(name, "username")) {
ah->user = value;
} else if (!strcmp(name, "cnonce")) {
ah->cnonce = value;
} else if (!strcmp(name, "response")) {
ah->response = value;
} else if (!strcmp(name, "uri")) {
ah->uri = value;
} else if (!strcmp(name, "qop")) {
ah->qop = value;
} else if (!strcmp(name, "nc")) {
ah->nc = value;
} else if (!strcmp(name, "nonce")) {
ah->nonce = value;
}
}
// CGI needs it as REMOTE_USER
if (ah->user != NULL) {
conn->request_info.remote_user = mg_strdup(ah->user);
} else {
return 0;
}
return 1;
}
static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
char *eof;
size_t len;
if (filep->membuf != NULL && *p != NULL) {
eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);
len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
memcpy(buf, *p, len);
buf[len] = '\0';
*p = eof;
return eof;
} else if (filep->fp != NULL) {
return fgets(buf, size, filep->fp);
} else {
return NULL;
}
}
// Authorize against the opened passwords file. Return 1 if authorized.
static int authorize(struct mg_connection *conn, struct file *filep) {
struct ah ah;
char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
return 0;
}
// Loop over passwords file
p = (char *) filep->membuf;
while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
continue;
}
if (!strcmp(ah.user, f_user) &&
!strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
return check_password(conn->request_info.request_method, ha1, ah.uri,
ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
}
return 0;
}
// Return 1 if request is authorised, 0 otherwise.
static int check_authorization(struct mg_connection *conn, const char *path) {
char fname[PATH_MAX];
struct vec uri_vec, filename_vec;
const char *list;
struct file file = STRUCT_FILE_INITIALIZER;
int authorized = 1;
list = conn->ctx->config[PROTECT_URI];
while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
mg_snprintf(conn, fname, sizeof(fname), "%.*s",
(int) filename_vec.len, filename_vec.ptr);
if (!mg_fopen(conn, fname, "r", &file)) {
cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
}
break;
}
}
if (!is_file_opened(&file)) {
open_auth_file(conn, path, &file);
}
if (is_file_opened(&file)) {
authorized = authorize(conn, &file);
mg_fclose(&file);
}
return authorized;
}
static void send_authorization_request(struct mg_connection *conn) {
conn->status_code = 401;
mg_printf(conn,
"HTTP/1.1 401 Unauthorized\r\n"
"Content-Length: 0\r\n"
"WWW-Authenticate: Digest qop=\"auth\", "
"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
conn->ctx->config[AUTHENTICATION_DOMAIN],
(unsigned long) time(NULL));
}
static int is_authorized_for_put(struct mg_connection *conn) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
int ret = 0;
if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
ret = authorize(conn, &file);
mg_fclose(&file);
}
return ret;
}
int mg_modify_passwords_file(const char *fname, const char *domain,
const char *user, const char *pass) {
int found;
char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
FILE *fp, *fp2;
found = 0;
fp = fp2 = NULL;
// Regard empty password as no password - remove user record.
if (pass != NULL && pass[0] == '\0') {
pass = NULL;
}
(void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
// Create the file if does not exist
if ((fp = fopen(fname, "a+")) != NULL) {
(void) fclose(fp);
}
// Open the given file and temporary file
if ((fp = fopen(fname, "r")) == NULL) {
return 0;
} else if ((fp2 = fopen(tmp, "w+")) == NULL) {
fclose(fp);
return 0;
}
// Copy the stuff to temporary file
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
continue;
}
if (!strcmp(u, user) && !strcmp(d, domain)) {
found++;
if (pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
} else {
fprintf(fp2, "%s", line);
}
}
// If new user, just add it
if (!found && pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
// Close files
fclose(fp);
fclose(fp2);
// Put the temp file in place of real file
remove(fname);
rename(tmp, fname);
return 1;
}
struct de {
struct mg_connection *conn;
char *file_name;
struct file file;
};
static void url_encode(const char *src, char *dst, size_t dst_len) {
static const char *dont_escape = "._-$,;~()";
static const char *hex = "0123456789abcdef";
const char *end = dst + dst_len - 1;
for (; *src != '\0' && dst < end; src++, dst++) {
if (isalnum(*(const unsigned char *) src) ||
strchr(dont_escape, * (const unsigned char *) src) != NULL) {
*dst = *src;
} else if (dst + 2 < end) {
dst[0] = '%';
dst[1] = hex[(* (const unsigned char *) src) >> 4];
dst[2] = hex[(* (const unsigned char *) src) & 0xf];
dst += 2;
}
}
*dst = '\0';
}
static void print_dir_entry(struct de *de) {
char size[64], mod[64], href[PATH_MAX];
if (de->file.is_directory) {
mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
} else {
// We use (signed) cast below because MSVC 6 compiler cannot
// convert unsigned __int64 to double. Sigh.
if (de->file.size < 1024) {
mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
} else if (de->file.size < 0x100000) {
mg_snprintf(de->conn, size, sizeof(size),
"%.1fk", (double) de->file.size / 1024.0);
} else if (de->file.size < 0x40000000) {
mg_snprintf(de->conn, size, sizeof(size),
"%.1fM", (double) de->file.size / 1048576);
} else {
mg_snprintf(de->conn, size, sizeof(size),
"%.1fG", (double) de->file.size / 1073741824);
}
}
strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
localtime(&de->file.modification_time));
url_encode(de->file_name, href, sizeof(href));
de->conn->num_bytes_sent += mg_printf(de->conn,
"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
de->file_name, de->file.is_directory ? "/" : "", mod, size);
}
// This function is called from send_directory() and used for
// sorting directory entries by size, or name, or modification time.
// On windows, __cdecl specification is needed in case if project is built
// with __stdcall convention. qsort always requires __cdels callback.
static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
const char *query_string = a->conn->request_info.query_string;
int cmp_result = 0;
if (query_string == NULL) {
query_string = "na";
}
if (a->file.is_directory && !b->file.is_directory) {
return -1; // Always put directories on top
} else if (!a->file.is_directory && b->file.is_directory) {
return 1; // Always put directories on top
} else if (*query_string == 'n') {
cmp_result = strcmp(a->file_name, b->file_name);
} else if (*query_string == 's') {
cmp_result = a->file.size == b->file.size ? 0 :
a->file.size > b->file.size ? 1 : -1;
} else if (*query_string == 'd') {
cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
a->file.modification_time > b->file.modification_time ? 1 : -1;
}
return query_string[1] == 'd' ? -cmp_result : cmp_result;
}
static int must_hide_file(struct mg_connection *conn, const char *path) {
const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
const char *pattern = conn->ctx->config[HIDE_FILES];
return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
(pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
}
static int scan_directory(struct mg_connection *conn, const char *dir,
void *data, void (*cb)(struct de *, void *)) {
char path[PATH_MAX];
struct dirent *dp;
DIR *dirp;
struct de de;
if ((dirp = opendir(dir)) == NULL) {
return 0;
} else {
de.conn = conn;
while ((dp = readdir(dirp)) != NULL) {
// Do not show current dir and hidden files
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..") ||
must_hide_file(conn, dp->d_name)) {
continue;
}
mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
// If we don't memset stat structure to zero, mtime will have
// garbage and strftime() will segfault later on in
// print_dir_entry(). memset is required only if mg_stat()
// fails. For more details, see
// http://code.google.com/p/mongoose/issues/detail?id=79
// mg_stat will memset the whole struct file with zeroes.
mg_stat(conn, path, &de.file);
de.file_name = dp->d_name;
cb(&de, data);
}
(void) closedir(dirp);
}
return 1;
}
struct dir_scan_data {
struct de *entries;
int num_entries;
int arr_size;
};
static void dir_scan_callback(struct de *de, void *data) {
struct dir_scan_data *dsd = (struct dir_scan_data *) data;
if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
dsd->arr_size *= 2;
dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
sizeof(dsd->entries[0]));
}
if (dsd->entries == NULL) {
// TODO(lsm): propagate an error to the caller
dsd->num_entries = 0;
} else {
dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
dsd->entries[dsd->num_entries].file = de->file;
dsd->entries[dsd->num_entries].conn = de->conn;
dsd->num_entries++;
}
}
static void handle_directory_request(struct mg_connection *conn,
const char *dir) {
int i, sort_direction;
struct dir_scan_data data = { NULL, 0, 128 };
if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
send_http_error(conn, 500, "Cannot open directory",
"Error: opendir(%s): %s", dir, strerror(ERRNO));
return;
}
sort_direction = conn->request_info.query_string != NULL &&
conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
conn->must_close = 1;
mg_printf(conn, "%s",
"HTTP/1.1 200 OK\r\n"
"Connection: close\r\n"
"Content-Type: text/html; charset=utf-8\r\n\r\n");
conn->num_bytes_sent += mg_printf(conn,
"<html><head><title>Index of %s</title>"
"<style>th {text-align: left;}</style></head>"
"<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
"<tr><th><a href=\"?n%c\">Name</a></th>"
"<th><a href=\"?d%c\">Modified</a></th>"
"<th><a href=\"?s%c\">Size</a></th></tr>"
"<tr><td colspan=\"3\"><hr></td></tr>",
conn->request_info.uri, conn->request_info.uri,
sort_direction, sort_direction, sort_direction);
// Print first entry - link to a parent directory
conn->num_bytes_sent += mg_printf(conn,
"<tr><td><a href=\"%s%s\">%s</a></td>"
"<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
conn->request_info.uri, "..", "Parent directory", "-", "-");
// Sort and print directory entries
qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
compare_dir_entries);
for (i = 0; i < data.num_entries; i++) {
print_dir_entry(&data.entries[i]);
free(data.entries[i].file_name);
}
free(data.entries);
conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
conn->status_code = 200;
}
// Send len bytes from the opened file to the client.
static void send_file_data(struct mg_connection *conn, struct file *filep,
int64_t offset, int64_t len) {
char buf[MG_BUF_LEN];
int to_read, num_read, num_written;
if (len > 0 && filep->membuf != NULL && filep->size > 0) {
if (len > filep->size - offset) {
len = filep->size - offset;
}
mg_write(conn, filep->membuf + offset, (size_t) len);
} else if (len > 0 && filep->fp != NULL) {
fseeko(filep->fp, offset, SEEK_SET);
while (len > 0) {
// Calculate how much to read from the file in the buffer
to_read = sizeof(buf);
if ((int64_t) to_read > len) {
to_read = (int) len;
}
// Read from file, exit the loop on error
if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
break;
}
// Send read bytes to the client, exit the loop on error
if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
break;
}
// Both read and were successful, adjust counters
conn->num_bytes_sent += num_written;
len -= num_written;
}
}
}
static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
}
static void construct_etag(char *buf, size_t buf_len,
const struct file *filep) {
snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
(unsigned long) filep->modification_time, filep->size);
}
static void fclose_on_exec(struct file *filep) {
if (filep != NULL && filep->fp != NULL) {
#ifndef _WIN32
fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
#endif
}
}
static void handle_file_request(struct mg_connection *conn, const char *path,
struct file *filep) {
char date[64], lm[64], etag[64], range[64];
const char *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t cl, r1, r2;
struct vec mime_vec;
int n;
get_mime_type(conn->ctx, path, &mime_vec);
cl = filep->size;
conn->status_code = 200;
range[0] = '\0';
if (!mg_fopen(conn, path, "rb", filep)) {
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
return;
}
fclose_on_exec(filep);
// If Range: header specified, act accordingly
r1 = r2 = 0;
hdr = mg_get_header(conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
r1 >= 0 && r2 > 0) {
conn->status_code = 206;
cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
mg_snprintf(conn, range, sizeof(range),
"Content-Range: bytes "
"%" INT64_FMT "-%"
INT64_FMT "/%" INT64_FMT "\r\n",
r1, r1 + cl - 1, filep->size);
msg = "Partial Content";
}
// Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
gmt_time_string(date, sizeof(date), &curtime);
gmt_time_string(lm, sizeof(lm), &filep->modification_time);
construct_etag(etag, sizeof(etag), filep);
(void) mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: %s\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %" INT64_FMT "\r\n"
"Connection: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s\r\n",
conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
mime_vec.ptr, cl, suggest_connection_header(conn), range);
if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
send_file_data(conn, filep, r1, cl);
}
mg_fclose(filep);
}
void mg_send_file(struct mg_connection *conn, const char *path) {
struct file file;
if (mg_stat(conn, path, &file)) {
handle_file_request(conn, path, &file);
} else {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
}
}
// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
static void parse_http_headers(char **buf, struct mg_request_info *ri) {
int i;
for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
ri->http_headers[i].value = skip(buf, "\r\n");
if (ri->http_headers[i].name[0] == '\0')
break;
ri->num_headers = i + 1;
}
}
static int is_valid_http_method(const char *method) {
return !strcmp(method, "GET") || !strcmp(method, "POST") ||
!strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
!strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
!strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
}
// Parse HTTP request, fill in mg_request_info structure.
// This function modifies the buffer by NUL-terminating
// HTTP request components, header names and header values.
static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
int request_length = get_request_len(buf, len);
if (request_length > 0) {
// Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
ri->num_headers = 0;
buf[request_length - 1] = '\0';
// RFC says that all initial whitespaces should be ingored
while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
buf++;
}
ri->request_method = skip(&buf, " ");
ri->uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
parse_http_headers(&buf, ri);
}
return request_length;
}
static int parse_http_request(char *buf, int len, struct mg_request_info *ri) {
int result = parse_http_message(buf, len, ri);
if (result > 0 &&
is_valid_http_method(ri->request_method) &&
!strncmp(ri->http_version, "HTTP/", 5)) {
ri->http_version += 5; // Skip "HTTP/"
} else {
result = -1;
}
return result;
}
static int parse_http_response(char *buf, int len, struct mg_request_info *ri) {
int result = parse_http_message(buf, len, ri);
return result > 0 && !strncmp(ri->request_method, "HTTP/", 5) ? result : -1;
}
// Keep reading the input (either opened file descriptor fd, or socket sock,
// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
// buffer (which marks the end of HTTP request). Buffer buf may already
// have some data. The length of the data is stored in nread.
// Upon every read operation, increase nread by the number of bytes read.
static int read_request(FILE *fp, struct mg_connection *conn,
char *buf, int bufsiz, int *nread) {
int request_len, n = 1;
request_len = get_request_len(buf, *nread);
while (*nread < bufsiz && request_len == 0 && n > 0) {
n = pull(fp, conn, buf + *nread, bufsiz - *nread);
if (n > 0) {
*nread += n;
request_len = get_request_len(buf, *nread);
}
}
if (n < 0) {
// recv() error -> propagate error; do not process a b0rked-with-very-high-probability request
return -1;
}
return request_len;
}
// For given directory path, substitute it to valid index file.
// Return 0 if index file has been found, -1 if not found.
// If the file is found, it's stats is returned in stp.
static int substitute_index_file(struct mg_connection *conn, char *path,
size_t path_len, struct file *filep) {
const char *list = conn->ctx->config[INDEX_FILES];
struct file file = STRUCT_FILE_INITIALIZER;
struct vec filename_vec;
size_t n = strlen(path);
int found = 0;
// The 'path' given to us points to the directory. Remove all trailing
// directory separator characters from the end of the path, and
// then append single directory separator character.
while (n > 0 && path[n - 1] == '/') {
n--;
}
path[n] = '/';
// Traverse index files list. For each entry, append it to the given
// path and see if the file exists. If it exists, break the loop
while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
// Ignore too long entries that may overflow path buffer
if (filename_vec.len > path_len - (n + 2))
continue;
// Prepare full path to the index file
mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
// Does it exist?
if (mg_stat(conn, path, &file)) {
// Yes it does, break the loop
*filep = file;
found = 1;
break;
}
}
// If no index file exists, restore directory path
if (!found) {
path[n] = '\0';
}
return found;
}
// Return True if we should reply 304 Not Modified.
static int is_not_modified(const struct mg_connection *conn,
const struct file *filep) {
char etag[64];
const char *ims = mg_get_header(conn, "If-Modified-Since");
const char *inm = mg_get_header(conn, "If-None-Match");
construct_etag(etag, sizeof(etag), filep);
return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
(ims != NULL && filep->modification_time <= parse_date_string(ims));
}
static int forward_body_data(struct mg_connection *conn, FILE *fp,
SOCKET sock, SSL *ssl) {
const char *expect, *body;
char buf[MG_BUF_LEN];
int to_read, nread, buffered_len, success = 0;
expect = mg_get_header(conn, "Expect");
assert(fp != NULL);
if (conn->content_len == -1) {
send_http_error(conn, 411, "Length Required", "%s", "");
} else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
send_http_error(conn, 417, "Expectation Failed", "%s", "");
} else {
if (expect != NULL) {
(void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
}
body = conn->buf + conn->request_len + conn->consumed_content;
buffered_len = &conn->buf[conn->data_len] - body;
assert(buffered_len >= 0);
assert(conn->consumed_content == 0);
if (buffered_len > 0) {
if ((int64_t) buffered_len > conn->content_len) {
buffered_len = (int) conn->content_len;
}
push(fp, sock, ssl, body, (int64_t) buffered_len);
conn->consumed_content += buffered_len;
}
nread = 0;
while (conn->consumed_content < conn->content_len) {
to_read = sizeof(buf);
if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
to_read = (int) (conn->content_len - conn->consumed_content);
}
nread = pull(NULL, conn, buf, to_read);
if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
break;
}
conn->consumed_content += nread;
}
if (conn->consumed_content == conn->content_len) {
success = nread >= 0;
}
// Each error code path in this function must send an error
if (!success) {
send_http_error(conn, 577, http_500_error, "%s", "");
}
}
return success;
}
#if !defined(NO_CGI)
// This structure helps to create an environment for the spawned CGI program.
// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
// last element must be NULL.
// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
// strings must reside in a contiguous buffer. The end of the buffer is
// marked by two '\0' characters.
// We satisfy both worlds: we create an envp array (which is vars), all
// entries are actually pointers inside buf.
struct cgi_env_block {
struct mg_connection *conn;
char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
int len; // Space taken
char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
int nvars; // Number of variables
};
static char *addenv(struct cgi_env_block *block,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(2, 3);
// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
// pointer into the vars array.
static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
int n, space;
char *added;
va_list ap;
// Calculate how much space is left in the buffer
space = sizeof(block->buf) - block->len - 2;
assert(space >= 0);
// Make a pointer to the free space int the buffer
added = block->buf + block->len;
// Copy VARIABLE=VALUE\0 string into the free space
va_start(ap, fmt);
n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
va_end(ap);
// Make sure we do not overflow buffer and the envp array
if (n > 0 && n + 1 < space &&
block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
// Append a pointer to the added string into the envp array
block->vars[block->nvars++] = added;
// Bump up used length counter. Include \0 terminator
block->len += n + 1;
} else {
cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
}
return added;
}
static void prepare_cgi_environment(struct mg_connection *conn,
const char *prog,
struct cgi_env_block *blk) {
const char *s, *slash;
struct vec var_vec;
char *p, src_addr[20];
int i;
blk->len = blk->nvars = 0;
blk->conn = conn;
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
// Prepare the environment block
addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
// TODO(lsm): fix this for IPv6 case
addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
addenv(blk, "REMOTE_ADDR=%s", src_addr);
addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
// SCRIPT_NAME
assert(conn->request_info.uri[0] == '/');
slash = strrchr(conn->request_info.uri, '/');
if ((s = strrchr(prog, '/')) == NULL)
s = prog;
addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
conn->request_info.uri, s);
addenv(blk, "SCRIPT_FILENAME=%s", prog);
addenv(blk, "PATH_TRANSLATED=%s", prog);
addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
if ((s = mg_get_header(conn, "Content-Type")) != NULL)
addenv(blk, "CONTENT_TYPE=%s", s);
if (conn->request_info.query_string != NULL)
addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
if ((s = mg_get_header(conn, "Content-Length")) != NULL)
addenv(blk, "CONTENT_LENGTH=%s", s);
if ((s = getenv("PATH")) != NULL)
addenv(blk, "PATH=%s", s);
if (conn->path_info != NULL) {
addenv(blk, "PATH_INFO=%s", conn->path_info);
}
#if defined(_WIN32)
if ((s = getenv("COMSPEC")) != NULL) {
addenv(blk, "COMSPEC=%s", s);
}
if ((s = getenv("SYSTEMROOT")) != NULL) {
addenv(blk, "SYSTEMROOT=%s", s);
}
if ((s = getenv("SystemDrive")) != NULL) {
addenv(blk, "SystemDrive=%s", s);
}
#else
if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
addenv(blk, "LD_LIBRARY_PATH=%s", s);
#endif // _WIN32
if ((s = getenv("PERLLIB")) != NULL)
addenv(blk, "PERLLIB=%s", s);
if (conn->request_info.remote_user != NULL) {
addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
addenv(blk, "%s", "AUTH_TYPE=Digest");
}
// Add all headers as HTTP_* variables
for (i = 0; i < conn->request_info.num_headers; i++) {
p = addenv(blk, "HTTP_%s=%s",
conn->request_info.http_headers[i].name,
conn->request_info.http_headers[i].value);
// Convert variable name into uppercase, and change - to _
for (; *p != '=' && *p != '\0'; p++) {
if (*p == '-')
*p = '_';
*p = (char) toupper(* (unsigned char *) p);
}
}
// Add user-specified variables
s = conn->ctx->config[CGI_ENVIRONMENT];
while ((s = next_option(s, &var_vec, NULL)) != NULL) {
addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
}
blk->vars[blk->nvars++] = NULL;
blk->buf[blk->len++] = '\0';
assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
assert(blk->len > 0);
assert(blk->len < (int) sizeof(blk->buf));
}
static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
const char *status, *status_text;
char buf[16384], *pbuf, dir[PATH_MAX], *p;
struct mg_request_info ri;
struct cgi_env_block blk;
FILE *in, *out;
struct file fout = STRUCT_FILE_INITIALIZER;
pid_t pid;
prepare_cgi_environment(conn, prog, &blk);
// CGI must be executed in its own directory. 'dir' must point to the
// directory containing executable program, 'p' must point to the
// executable program name relative to 'dir'.
(void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
if ((p = strrchr(dir, '/')) != NULL) {
*p++ = '\0';
} else {
dir[0] = '.', dir[1] = '\0';
p = (char *) prog;
}
pid = (pid_t) -1;
fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
in = out = NULL;
if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
send_http_error(conn, 500, http_500_error,
"Cannot create CGI pipe: %s", strerror(ERRNO));
goto done;
} else if ((pid = spawn_process(conn, p, blk.buf, blk.vars,
fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) {
send_http_error(conn, 500, http_500_error,
"Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
goto done;
}
// spawn_process() must close those!
// If we don't mark them as closed, close() attempt before
// return from this function throws an exception on Windows.
// Windows does not like when closed descriptor is closed again.
fd_stdin[0] = fd_stdout[1] = -1;
if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
(out = fdopen(fd_stdout[0], "rb")) == NULL) {
send_http_error(conn, 500, http_500_error,
"fopen: %s", strerror(ERRNO));
goto done;
}
setbuf(in, NULL);
setbuf(out, NULL);
fout.fp = out;
// Send POST data to the CGI process if needed
if (!strcmp(conn->request_info.request_method, "POST") &&
!forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
goto done;
}
// Close so child gets an EOF.
fclose(in);
in = NULL;
fd_stdin[1] = -1;
// Now read CGI reply into a buffer. We need to set correct
// status code, thus we need to see all HTTP headers first.
// Do not send anything back to client, until we buffer in all
// HTTP headers.
data_len = 0;
headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
if (headers_len <= 0) {
send_http_error(conn, 500, http_500_error,
"CGI program sent malformed or too big (>%u bytes) "
"HTTP headers: [%.*s]",
(unsigned) sizeof(buf), data_len, buf);
goto done;
}
pbuf = buf;
buf[headers_len - 1] = '\0';
parse_http_headers(&pbuf, &ri);
// Make up and send the status line
status_text = "OK";
if ((status = get_header(&ri, "Status")) != NULL) {
conn->status_code = atoi(status);
status_text = status;
while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
status_text++;
}
} else if (get_header(&ri, "Location") != NULL) {
conn->status_code = 302;
} else {
conn->status_code = 200;
}
if (get_header(&ri, "Connection") != NULL &&
!mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
conn->must_close = 1;
}
(void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
status_text);
// Send headers
for (i = 0; i < ri.num_headers; i++) {
mg_printf(conn, "%s: %s\r\n",
ri.http_headers[i].name, ri.http_headers[i].value);
}
mg_write(conn, "\r\n", 2);
// Send chunk of data that may have been read after the headers
conn->num_bytes_sent += mg_write(conn, buf + headers_len,
(size_t)(data_len - headers_len));
// Read the rest of CGI output and send to the client
send_file_data(conn, &fout, 0, INT64_MAX);
done:
if (pid != (pid_t) -1) {
kill(pid, SIGKILL);
}
if (fd_stdin[0] != -1) {
close(fd_stdin[0]);
}
if (fd_stdout[1] != -1) {
close(fd_stdout[1]);
}
if (in != NULL) {
fclose(in);
} else if (fd_stdin[1] != -1) {
close(fd_stdin[1]);
}
if (out != NULL) {
fclose(out);
} else if (fd_stdout[0] != -1) {
close(fd_stdout[0]);
}
}
#endif // !NO_CGI
// For a given PUT path, create all intermediate subdirectories
// for given path. Return 0 if the path itself is a directory,
// or -1 on error, 1 if OK.
static int put_dir(struct mg_connection *conn, const char *path) {
char buf[PATH_MAX];
const char *s, *p;
struct file file;
int len, res = 1;
for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
len = p - path;
if (len >= (int) sizeof(buf)) {
res = -1;
break;
}
memcpy(buf, path, len);
buf[len] = '\0';
// Try to create intermediate directory
DEBUG_TRACE(("mkdir(%s)", buf));
if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
res = -1;
break;
}
// Is path itself a directory?
if (p[1] == '\0') {
res = 0;
}
}
return res;
}
static void put_file(struct mg_connection *conn, const char *path) {
struct file file;
const char *range;
int64_t r1, r2;
int rc;
conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
if ((rc = put_dir(conn, path)) == 0) {
mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
} else if (rc == -1) {
send_http_error(conn, 500, http_500_error,
"put_dir(%s): %s", path, strerror(ERRNO));
} else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
mg_fclose(&file);
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
} else {
fclose_on_exec(&file);
range = mg_get_header(conn, "Content-Range");
r1 = r2 = 0;
if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
conn->status_code = 206;
fseeko(file.fp, r1, SEEK_SET);
}
if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
}
mg_fclose(&file);
}
}
static void send_ssi_file(struct mg_connection *, const char *,
struct file *, int);
static void do_ssi_include(struct mg_connection *conn, const char *ssi,
char *tag, int include_level) {
char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
struct file file;
// sscanf() is safe here, since send_ssi_file() also uses buffer
// of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver root
(void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
} else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver working directory
// or it is absolute system path
(void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
} else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
// File name is relative to the currect document
(void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
if ((p = strrchr(path, '/')) != NULL) {
p[1] = '\0';
}
(void) mg_snprintf(conn, path + strlen(path),
sizeof(path) - strlen(path), "%s", file_name);
} else {
cry(conn, "Bad SSI #include: [%s]", tag);
return;
}
if (!mg_fopen(conn, path, "rb", &file)) {
cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
tag, path, strerror(ERRNO));
} else {
fclose_on_exec(&file);
if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
send_ssi_file(conn, path, &file, include_level + 1);
} else {
send_file_data(conn, &file, 0, INT64_MAX);
}
mg_fclose(&file);
}
}
#if !defined(NO_POPEN)
static void do_ssi_exec(struct mg_connection *conn, char *tag) {
char cmd[MG_BUF_LEN];
struct file file = STRUCT_FILE_INITIALIZER;
if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
cry(conn, "Bad SSI #exec: [%s]", tag);
} else if ((file.fp = popen(cmd, "r")) == NULL) {
cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
} else {
send_file_data(conn, &file, 0, INT64_MAX);
pclose(file.fp);
}
}
#endif // !NO_POPEN
static int mg_fgetc(struct file *filep, int offset) {
if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
return ((unsigned char *) filep->membuf)[offset];
} else if (filep->fp != NULL) {
return fgetc(filep->fp);
} else {
return EOF;
}
}
static void send_ssi_file(struct mg_connection *conn, const char *path,
struct file *filep, int include_level) {
char buf[MG_BUF_LEN];
int ch, offset, len, in_ssi_tag;
if (include_level > 10) {
cry(conn, "SSI #include level is too deep (%s)", path);
return;
}
in_ssi_tag = len = offset = 0;
while ((ch = mg_fgetc(filep, offset)) != EOF) {
if (in_ssi_tag && ch == '>') {
in_ssi_tag = 0;
buf[len++] = (char) ch;
buf[len] = '\0';
assert(len <= (int) sizeof(buf));
if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
// Not an SSI tag, pass it
(void) mg_write(conn, buf, (size_t) len);
} else {
if (!memcmp(buf + 5, "include", 7)) {
do_ssi_include(conn, path, buf + 12, include_level);
#if !defined(NO_POPEN)
} else if (!memcmp(buf + 5, "exec", 4)) {
do_ssi_exec(conn, buf + 9);
#endif // !NO_POPEN
} else {
cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
}
}
len = 0;
} else if (in_ssi_tag) {
if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
// Not an SSI tag
in_ssi_tag = 0;
} else if (len == (int) sizeof(buf) - 2) {
cry(conn, "%s: SSI tag is too large", path);
len = 0;
}
buf[len++] = ch & 0xff;
} else if (ch == '<') {
in_ssi_tag = 1;
if (len > 0) {
mg_write(conn, buf, (size_t) len);
}
len = 0;
buf[len++] = ch & 0xff;
} else {
buf[len++] = ch & 0xff;
if (len == (int) sizeof(buf)) {
mg_write(conn, buf, (size_t) len);
len = 0;
}
}
}
// Send the rest of buffered data
if (len > 0) {
mg_write(conn, buf, (size_t) len);
}
}
static void handle_ssi_file_request(struct mg_connection *conn,
const char *path) {
struct file file;
if (!mg_fopen(conn, path, "rb", &file)) {
send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
strerror(ERRNO));
} else {
conn->must_close = 1;
fclose_on_exec(&file);
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\nConnection: %s\r\n\r\n",
suggest_connection_header(conn));
send_ssi_file(conn, path, &file, 0);
mg_fclose(&file);
}
}
static void send_options(struct mg_connection *conn) {
conn->status_code = 200;
mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
"Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
"DAV: 1\r\n\r\n");
}
// Writes PROPFIND properties for a collection element
static void print_props(struct mg_connection *conn, const char* uri,
struct file *filep) {
char mtime[64];
gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
conn->num_bytes_sent += mg_printf(conn,
"<d:response>"
"<d:href>%s</d:href>"
"<d:propstat>"
"<d:prop>"
"<d:resourcetype>%s</d:resourcetype>"
"<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
"<d:getlastmodified>%s</d:getlastmodified>"
"</d:prop>"
"<d:status>HTTP/1.1 200 OK</d:status>"
"</d:propstat>"
"</d:response>\n",
uri,
filep->is_directory ? "<d:collection/>" : "",
filep->size,
mtime);
}
static void print_dav_dir_entry(struct de *de, void *data) {
char href[PATH_MAX];
struct mg_connection *conn = (struct mg_connection *) data;
mg_snprintf(conn, href, sizeof(href), "%s%s",
conn->request_info.uri, de->file_name);
print_props(conn, href, &de->file);
}
static void handle_propfind(struct mg_connection *conn, const char *path,
struct file *filep) {
const char *depth = mg_get_header(conn, "Depth");
conn->must_close = 1;
conn->status_code = 207;
mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
"Connection: close\r\n"
"Content-Type: text/xml; charset=utf-8\r\n\r\n");
conn->num_bytes_sent += mg_printf(conn,
"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<d:multistatus xmlns:d='DAV:'>\n");
// Print properties for the requested resource itself
print_props(conn, conn->request_info.uri, filep);
// If it is a directory, print directory entries too if Depth is not 0
if (filep->is_directory &&
!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
(depth == NULL || strcmp(depth, "0") != 0)) {
scan_directory(conn, path, conn, &print_dav_dir_entry);
}
conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
}
#if defined(USE_WEBSOCKET)
// START OF SHA-1 code
// Copyright(c) By Steve Reid <steve@edmweb.com>
#define SHA1HANDSOFF
#if defined(__sun)
#include "solarisfixes.h"
#endif
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
#if BYTE_ORDER == LITTLE_ENDIAN
#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
|(rol(block->l[i],8)&0x00FF00FF))
#elif BYTE_ORDER == BIG_ENDIAN
#define blk0(i) block->l[i]
#else
#error "Endianness not defined!"
#endif
#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
^block->l[(i+2)&15]^block->l[i&15],1))
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
typedef struct {
uint32_t state[5];
uint32_t count[2];
unsigned char buffer[64];
} SHA1_CTX;
static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
uint32_t a, b, c, d, e;
typedef union { unsigned char c[64]; uint32_t l[16]; } CHAR64LONG16;
CHAR64LONG16 block[1];
memcpy(block, buffer, 64);
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
a = b = c = d = e = 0;
memset(block, '\0', sizeof(block));
}
static void SHA1Init(SHA1_CTX* context) {
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
context->state[4] = 0xC3D2E1F0;
context->count[0] = context->count[1] = 0;
}
static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
uint32_t len) {
uint32_t i, j;
j = context->count[0];
if ((context->count[0] += len << 3) < j)
context->count[1]++;
context->count[1] += (len>>29);
j = (j >> 3) & 63;
if ((j + len) > 63) {
memcpy(&context->buffer[j], data, (i = 64-j));
SHA1Transform(context->state, context->buffer);
for ( ; i + 63 < len; i += 64) {
SHA1Transform(context->state, &data[i]);
}
j = 0;
}
else i = 0;
memcpy(&context->buffer[j], &data[i], len - i);
}
static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
unsigned i;
unsigned char finalcount[8], c;
for (i = 0; i < 8; i++) {
finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
>> ((3-(i & 3)) * 8) ) & 255);
}
c = 0200;
SHA1Update(context, &c, 1);
while ((context->count[0] & 504) != 448) {
c = 0000;
SHA1Update(context, &c, 1);
}
SHA1Update(context, finalcount, 8);
for (i = 0; i < 20; i++) {
digest[i] = (unsigned char)
((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
}
memset(context, '\0', sizeof(*context));
memset(&finalcount, '\0', sizeof(finalcount));
}
// END OF SHA1 CODE
static void base64_encode(const unsigned char *src, int src_len, char *dst) {
static const char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int i, j, a, b, c;
for (i = j = 0; i < src_len; i += 3) {
a = src[i];
b = i + 1 >= src_len ? 0 : src[i + 1];
c = i + 2 >= src_len ? 0 : src[i + 2];
dst[j++] = b64[a >> 2];
dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
if (i + 1 < src_len) {
dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
}
if (i + 2 < src_len) {
dst[j++] = b64[c & 63];
}
}
while (j % 4 != 0) {
dst[j++] = '=';
}
dst[j++] = '\0';
}
static void send_websocket_handshake(struct mg_connection *conn) {
static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
SHA1_CTX sha_ctx;
mg_snprintf(conn, buf, sizeof(buf), "%s%s",
mg_get_header(conn, "Sec-WebSocket-Key"), magic);
SHA1Init(&sha_ctx);
SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
SHA1Final((unsigned char *) sha, &sha_ctx);
base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
mg_printf(conn, "%s%s%s",
"HTTP/1.1 101 Switching Protocols\r\n"
"Upgrade: websocket\r\n"
"Connection: Upgrade\r\n"
"Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
}
static void read_websocket(struct mg_connection *conn) {
unsigned char *mask, *buf = (unsigned char *) conn->buf + conn->request_len;
int n, len, mask_len, body_len, discard_len;
for (;;) {
if ((body_len = conn->data_len - conn->request_len) >= 2) {
len = buf[1] & 127;
mask_len = buf[1] & 128 ? 4 : 0;
if (len < 126) {
conn->content_len = 2 + mask_len + len;
mask = buf + 2;
} else if (len == 126 && body_len >= 4) {
conn->content_len = 2 + mask_len + ((((int) buf[2]) << 8) + buf[3]);
mask = buf + 4;
} else if (body_len >= 10) {
conn->content_len = 2 + mask_len +
(((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) |
htonl(* (uint32_t *) &buf[6]);
mask = buf + 10;
}
}
if (conn->content_len > 0) {
if (call_user(conn, MG_WEBSOCKET_MESSAGE) != NULL) {
break; // Callback signalled to exit
}
discard_len = conn->content_len > body_len ?
body_len : (int) conn->content_len;
memmove(buf, buf + discard_len, conn->data_len - discard_len);
conn->data_len -= discard_len;
conn->content_len = conn->consumed_content = 0;
} else {
if (wait_until_socket_is_readable(conn) == 0) {
break;
}
n = pull(NULL, conn, conn->buf + conn->data_len,
conn->buf_size - conn->data_len);
if (n <= 0) {
break;
}
conn->data_len += n;
}
}
}
static void handle_websocket_request(struct mg_connection *conn) {
if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {
send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
} else if (call_user(conn, MG_WEBSOCKET_CONNECT) != NULL) {
// Callback has returned non-NULL, do not proceed with handshake
} else {
send_websocket_handshake(conn);
call_user(conn, MG_WEBSOCKET_READY);
read_websocket(conn);
call_user(conn, MG_WEBSOCKET_CLOSE);
}
}
static int is_websocket_request(const struct mg_connection *conn) {
const char *host, *upgrade, *connection, *version, *key;
host = mg_get_header(conn, "Host");
upgrade = mg_get_header(conn, "Upgrade");
connection = mg_get_header(conn, "Connection");
key = mg_get_header(conn, "Sec-WebSocket-Key");
version = mg_get_header(conn, "Sec-WebSocket-Version");
return host != NULL && upgrade != NULL && connection != NULL &&
key != NULL && version != NULL &&
strstr(upgrade, "websocket") != NULL &&
strstr(connection, "Upgrade") != NULL;
}
#endif // !USE_WEBSOCKET
static int isbyte(int n) {
return n >= 0 && n <= 255;
}
static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
int n, a, b, c, d, slash = 32, len = 0;
if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
slash >= 0 && slash < 33) {
len = n;
*net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
*mask = slash ? 0xffffffffU << (32 - slash) : 0;
}
return len;
}
static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
int throttle = 0;
struct vec vec, val;
uint32_t net, mask;
char mult;
double v;
while ((spec = next_option(spec, &vec, &val)) != NULL) {
mult = ',';
if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
(lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
continue;
}
v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
if (vec.len == 1 && vec.ptr[0] == '*') {
throttle = (int) v;
} else if (parse_net(vec.ptr, &net, &mask) > 0) {
if ((remote_ip & mask) == net) {
throttle = (int) v;
}
} else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
throttle = (int) v;
}
}
return throttle;
}
static uint32_t get_remote_ip(const struct mg_connection *conn) {
return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
}
#ifdef USE_LUA
#ifdef _WIN32
static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,
int offset) {
HANDLE fh = (HANDLE) _get_osfhandle(fd);
HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);
void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);
CloseHandle(fh);
CloseHandle(mh);
return p;
}
#define munmap(x, y) UnmapViewOfFile(x)
#define MAP_FAILED NULL
#define MAP_PRIVATE 0
#define PROT_READ 0
#else
#include <sys/mman.h>
#endif
static void lsp(struct mg_connection *conn, const char *p, int64_t len,
lua_State *L) {
int i, j, pos = 0;
for (i = 0; i < len; i++) {
if (p[i] == '<' && p[i + 1] == '?') {
for (j = i + 1; j < len ; j++) {
if (p[j] == '?' && p[j + 1] == '>') {
mg_write(conn, p + pos, i - pos);
if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), "") == LUA_OK) {
lua_pcall(L, 0, LUA_MULTRET, 0);
}
pos = j + 2;
i = pos - 1;
break;
}
}
}
}
if (i > pos) {
mg_write(conn, p + pos, i - pos);
}
}
static int lsp_mg_print(lua_State *L) {
int i, num_args;
const char *str;
size_t size;
struct mg_connection *conn =