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libspamc.c
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libspamc.c
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/* <@LICENSE>
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* </@LICENSE>
*/
/*
Compile with extra warnings -- gcc only, not suitable for use as default:
gcc -Wextra -Wdeclaration-after-statement -Wall -g -O2 spamc/spamc.c \
spamc/getopt.c spamc/libspamc.c spamc/utils.c -o spamc/spamc -ldl -lz
*/
#include "config.h"
#include "libspamc.h"
#include "utils.h"
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define strcasecmp stricmp
#define sleep Sleep
#include <io.h>
#else
#include <syslog.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#define closesocket(x) close(x)
#endif
#ifdef HAVE_SYSEXITS_H
#include <sysexits.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#endif
/* RedHat 5.2 doesn't define Shutdown 2nd Parameter Constants */
/* KAM 12-4-01 */
/* SJF 2003/04/25 - now test for macros directly */
#ifndef SHUT_RD
# define SHUT_RD 0 /* no more receptions */
#endif
#ifndef SHUT_WR
# define SHUT_WR 1 /* no more transmissions */
#endif
#ifndef SHUT_RDWR
# define SHUT_RDWR 2 /* no more receptions or transmissions */
#endif
#ifndef HAVE_H_ERRNO
#define h_errno errno
#endif
#ifdef _WIN32
#define spamc_get_errno() WSAGetLastError()
#else
#define spamc_get_errno() errno
#endif
#ifndef HAVE_OPTARG
extern char *optarg;
#endif
#ifndef HAVE_INADDR_NONE
#define INADDR_NONE ((in_addr_t) 0xffffffff)
#endif
/* jm: turned off for now, it should not be necessary. */
#undef USE_TCP_NODELAY
#ifndef HAVE_EX__MAX
/* jm: very conservative figure, should be well out of range on almost all NIXes */
#define EX__MAX 200
#endif
#undef DO_CONNECT_DEBUG_SYSLOGS
/*
#define DO_CONNECT_DEBUG_SYSLOGS 1
#define CONNECT_DEBUG_LEVEL LOG_DEBUG
*/
/* bug 4477 comment 14 */
#ifdef NI_MAXHOST
#define SPAMC_MAXHOST NI_MAXHOST
#else
#define SPAMC_MAXHOST 256
#endif
#ifdef NI_MAXSERV
#define SPAMC_MAXSERV NI_MAXSERV
#else
#define SPAMC_MAXSERV 256
#endif
/* static const int ESC_PASSTHROUGHRAW = EX__MAX + 666; No longer seems to be used */
/* set EXPANSION_ALLOWANCE to something more than might be
added to a message in X-headers and the report template */
static const int EXPANSION_ALLOWANCE = 16384;
/* set NUM_CHECK_BYTES to number of bytes that have to match at beginning and end
of the data streams before and after processing by spamd
Aug 7 2002 jm: no longer seems to be used
static const int NUM_CHECK_BYTES = 32;
*/
/* Set the protocol version that this spamc speaks */
static const char *PROTOCOL_VERSION = "SPAMC/1.4";
/* "private" part of struct message.
* we use this instead of the struct message directly, so that we
* can add new members without affecting the ABI.
*/
struct libspamc_private_message
{
int flags; /* copied from "flags" arg to message_read() */
int alloced_size; /* allocated space for the "out" buffer */
};
int libspamc_timeout = 0;
/*
* translate_connect_errno()
*
* Given a UNIX error number obtained (probably) from "connect(2)",
* translate this to a failure code. This module is shared by both
* transport modules - UNIX and TCP.
*
* This should ONLY be called when there is an error.
*/
static int _translate_connect_errno(int err)
{
switch (err) {
case EBADF:
case EFAULT:
case ENOTSOCK:
case EISCONN:
case EADDRINUSE:
case EINPROGRESS:
case EALREADY:
case EAFNOSUPPORT:
return EX_SOFTWARE;
case ECONNREFUSED:
case ETIMEDOUT:
case ENETUNREACH:
return EX_UNAVAILABLE;
case EACCES:
return EX_NOPERM;
default:
return EX_SOFTWARE;
}
}
/*
* opensocket()
*
* Given a socket type (PF_INET or PF_UNIX), try to create this socket
* and store the FD in the pointed-to place. If it's successful, do any
* other setup required to make the socket ready to use, such as setting
* TCP_NODELAY mode, and in any case we return EX_OK if all is well.
*
* Upon failure we return one of the other EX_??? error codes.
*/
#ifdef SPAMC_HAS_ADDRINFO
static int _opensocket(int flags, struct addrinfo *res, int *psock)
{
#else
static int _opensocket(int flags, int type, int *psock)
{
int proto = 0;
#endif
const char *typename;
int origerr;
#ifdef _WIN32
int socktout;
#endif
assert(psock != 0);
/*----------------------------------------------------------------
* Create a few induction variables that are implied by the socket
* type given by the user. The typename is strictly used for debug
* reporting.
*/
#ifdef SPAMC_HAS_ADDRINFO
switch(res->ai_family) {
case PF_UNIX:
typename = "PF_UNIX";
break;
case PF_INET:
typename = "PF_INET";
break;
case PF_INET6:
typename = "PF_INET6";
break;
default:
typename = "Unknown";
break;
}
#else
if (type == PF_UNIX) {
typename = "PF_UNIX";
}
else {
typename = "PF_INET";
proto = IPPROTO_TCP;
}
#endif
#ifdef DO_CONNECT_DEBUG_SYSLOGS
libspamc_log(flags, CONNECT_DEBUG_LEVEL, "dbg: create socket(%s)", typename);
#endif
#ifdef SPAMC_HAS_ADDRINFO
if ((*psock = socket(res->ai_family, res->ai_socktype, res->ai_protocol))
#else
if ((*psock = socket(type, SOCK_STREAM, proto))
#endif
#ifndef _WIN32
< 0
#else
== INVALID_SOCKET
#endif
) {
/*--------------------------------------------------------
* At this point we had a failure creating the socket, and
* this is pretty much fatal. Translate the error reason
* into something the user can understand.
*/
origerr = spamc_get_errno();
#ifndef _WIN32
libspamc_log(flags, LOG_ERR, "socket(%s) to spamd failed: %s", typename, strerror(origerr));
#else
libspamc_log(flags, LOG_ERR, "socket(%s) to spamd failed: %d", typename, origerr);
#endif
switch (origerr) {
case EPROTONOSUPPORT:
case EINVAL:
return EX_SOFTWARE;
case EACCES:
return EX_NOPERM;
case ENFILE:
case EMFILE:
case ENOBUFS:
case ENOMEM:
return EX_OSERR;
default:
return EX_SOFTWARE;
}
}
#ifdef _WIN32
/* bug 4344: makes timeout functional on Win32 */
socktout = libspamc_timeout * 1000;
if (type == PF_INET
&& setsockopt(*psock, SOL_SOCKET, SO_RCVTIMEO, (char *)&socktout, sizeof(socktout)) != 0)
{
origerr = spamc_get_errno();
switch (origerr)
{
case EBADF:
case ENOTSOCK:
case ENOPROTOOPT:
case EFAULT:
libspamc_log(flags, LOG_ERR, "setsockopt(SO_RCVTIMEO) failed: %d", origerr);
closesocket(*psock);
return EX_SOFTWARE;
default:
break; /* ignored */
}
}
#endif
/*----------------------------------------------------------------
* Do a bit of setup on the TCP socket if required. Notes above
* suggest this is probably not set
*/
#ifdef USE_TCP_NODELAY
{
int one = 1;
if (type == PF_INET
&& setsockopt(*psock, 0, TCP_NODELAY, &one, sizeof one) != 0) {
origerr = spamc_get_errno();
switch (origerr) {
case EBADF:
case ENOTSOCK:
case ENOPROTOOPT:
case EFAULT:
libspamc_log(flags, LOG_ERR,
#ifndef _WIN32
"setsockopt(TCP_NODELAY) failed: %s", strerror(origerr));
#else
"setsockopt(TCP_NODELAY) failed: %d", origerr);
#endif
closesocket(*psock);
return EX_SOFTWARE;
default:
break; /* ignored */
}
}
}
#endif /* USE_TCP_NODELAY */
return EX_OK; /* all is well */
}
/*
* try_to_connect_unix()
*
* Given a transport handle that implies using a UNIX domain
* socket, try to make a connection to it and store the resulting
* file descriptor in *sockptr. Return is EX_OK if we did it,
* and some other error code otherwise.
*/
static int _try_to_connect_unix(struct transport *tp, int *sockptr)
{
#ifndef _WIN32
int mysock, status, origerr;
struct sockaddr_un addrbuf;
#ifdef SPAMC_HAS_ADDRINFO
struct addrinfo hints, *res;
#else
int res = PF_UNIX;
#endif
int ret;
assert(tp != 0);
assert(sockptr != 0);
assert(tp->socketpath != 0);
#ifdef SPAMC_HAS_ADDRINFO
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNIX;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
res = &hints;
#endif
/*----------------------------------------------------------------
* If the socket itself can't be created, this is a fatal error.
*/
if ((ret = _opensocket(tp->flags, res, &mysock)) != EX_OK)
return ret;
/* set up the UNIX domain socket */
memset(&addrbuf, 0, sizeof addrbuf);
addrbuf.sun_family = AF_UNIX;
strncpy(addrbuf.sun_path, tp->socketpath, sizeof addrbuf.sun_path - 1);
addrbuf.sun_path[sizeof addrbuf.sun_path - 1] = '\0';
#ifdef DO_CONNECT_DEBUG_SYSLOGS
libspamc_log(tp->flags, CONNECT_DEBUG_LEVEL, "dbg: connect(AF_UNIX) to spamd at %s",
addrbuf.sun_path);
#endif
status = timeout_connect(mysock, (struct sockaddr *) &addrbuf, sizeof(addrbuf));
origerr = errno;
if (status >= 0) {
#ifdef DO_CONNECT_DEBUG_SYSLOGS
libspamc_log(tp->flags, CONNECT_DEBUG_LEVEL, "dbg: connect(AF_UNIX) ok");
#endif
*sockptr = mysock;
return EX_OK;
}
libspamc_log(tp->flags, LOG_ERR, "connect(AF_UNIX) to spamd %s failed: %s",
addrbuf.sun_path, strerror(origerr));
closesocket(mysock);
return _translate_connect_errno(origerr);
#else
(void) tp; /* not used. suppress compiler warning */
(void) sockptr; /* not used. suppress compiler warning */
return EX_OSERR;
#endif
}
/*
* try_to_connect_tcp()
*
* Given a transport that implies a TCP connection, either to
* localhost or a list of IP addresses, attempt to connect. The
* list of IP addresses has already been randomized (if requested)
* and limited to just one if fallback has been enabled.
*/
static int _try_to_connect_tcp(const struct transport *tp, int *sockptr)
{
int numloops;
int origerr = 0;
int ret;
#ifdef SPAMC_HAS_ADDRINFO
struct addrinfo *res = NULL;
#else
int res = PF_INET;
#endif
char host[SPAMC_MAXHOST-1]; /* hostname, for logging */
char port[SPAMC_MAXSERV-1]; /* port, for logging */
int connect_retries, retry_sleep;
assert(tp != 0);
assert(sockptr != 0);
assert(tp->nhosts > 0);
/* default values */
retry_sleep = tp->retry_sleep;
connect_retries = tp->connect_retries;
if (connect_retries == 0) {
connect_retries = 3;
}
if (retry_sleep < 0) {
retry_sleep = 1;
}
for (numloops = 0; numloops < connect_retries; numloops++) {
const int hostix = numloops % tp->nhosts;
int status, mysock;
/*--------------------------------------------------------
* We always start by creating the socket, as we get only
* one attempt to connect() on each one. If this fails,
* we're done.
*/
#ifdef SPAMC_HAS_ADDRINFO
res = tp->hosts[hostix];
while(res) {
char *family = NULL;
switch(res->ai_family) {
case AF_INET:
family = "AF_INET";
break;
case AF_INET6:
family = "AF_INET6";
break;
default:
family = "Unknown";
break;
}
if ((ret = _opensocket(tp->flags, res, &mysock)) != EX_OK) {
res = res->ai_next;
continue;
}
getnameinfo(res->ai_addr, res->ai_addrlen,
host, sizeof(host),
port, sizeof(port),
NI_NUMERICHOST|NI_NUMERICSERV);
#ifdef DO_CONNECT_DEBUG_SYSLOGS
libspamc_log(tp->flags, CONNECT_DEBUG_LEVEL,
"dbg: connect(%s) to spamd (host %s, port %s) (try #%d of %d)",
family, host, port, numloops + 1, connect_retries);
#endif
/* this is special-cased so that we have an address we can
* safely use as an "always fail" test case */
if (!strcmp(host, "255.255.255.255")) {
libspamc_log(tp->flags, LOG_ERR,
"connect to spamd on %s failed, broadcast addr",
host);
status = -1;
}
else {
status = timeout_connect(mysock, res->ai_addr, res->ai_addrlen);
}
#else
struct sockaddr_in addrbuf;
const char *ipaddr;
const char* family="AF_INET";
if ((ret = _opensocket(tp->flags, PF_INET, &mysock)) != EX_OK)
return ret;
memset(&addrbuf, 0, sizeof(addrbuf));
addrbuf.sin_family = AF_INET;
addrbuf.sin_port = htons(tp->port);
addrbuf.sin_addr = tp->hosts[hostix];
ipaddr = inet_ntoa(addrbuf.sin_addr);
/* make a copy in host, for logging (bug 5577) */
strncpy (host, ipaddr, sizeof(host) - 1);
#ifdef DO_CONNECT_DEBUG_SYSLOGS
libspamc_log(tp->flags, LOG_DEBUG,
"dbg: connect(AF_INET) to spamd at %s (try #%d of %d)",
ipaddr, numloops + 1, connect_retries);
#endif
/* this is special-cased so that we have an address we can
* safely use as an "always fail" test case */
if (!strcmp(ipaddr, "255.255.255.255")) {
libspamc_log(tp->flags, LOG_ERR,
"connect to spamd on %s failed, broadcast addr",
ipaddr);
status = -1;
}
else {
status = timeout_connect(mysock, (struct sockaddr *) &addrbuf,
sizeof(addrbuf));
}
#endif
if (status != 0) {
origerr = spamc_get_errno();
closesocket(mysock);
#ifndef _WIN32
libspamc_log(tp->flags, LOG_ERR,
"connect to spamd on %s failed, retrying (#%d of %d): %s",
host, numloops+1, connect_retries, strerror(origerr));
#else
libspamc_log(tp->flags, LOG_ERR,
"connect to spamd on %s failed, retrying (#%d of %d): %d",
host, numloops+1, connect_retries, origerr);
#endif
} else {
#ifdef DO_CONNECT_DEBUG_SYSLOGS
libspamc_log(tp->flags, CONNECT_DEBUG_LEVEL,
"dbg: connect(%s) to spamd done",family);
#endif
*sockptr = mysock;
return EX_OK;
}
#ifdef SPAMC_HAS_ADDRINFO
res = res->ai_next;
}
#endif
sleep(retry_sleep);
} /* for(numloops...) */
#ifdef SPAMC_HAS_ADDRINFO
for(numloops=0;numloops<tp->nhosts;numloops++) {
freeaddrinfo(tp->hosts[numloops]);
}
#endif
libspamc_log(tp->flags, LOG_ERR,
"connection attempt to spamd aborted after %d retries",
connect_retries);
return _translate_connect_errno(origerr);
}
/* Aug 14, 2002 bj: Reworked things. Now we have message_read, message_write,
* message_dump, lookup_host, message_filter, and message_process, and a bunch
* of helper functions.
*/
static void _clear_message(struct message *m)
{
m->type = MESSAGE_NONE;
m->raw = NULL;
m->raw_len = 0;
m->pre = NULL;
m->pre_len = 0;
m->msg = NULL;
m->msg_len = 0;
m->post = NULL;
m->post_len = 0;
m->is_spam = EX_TOOBIG;
m->score = 0.0;
m->threshold = 0.0;
m->outbuf = NULL;
m->out = NULL;
m->out_len = 0;
m->content_length = -1;
}
static void _free_zlib_buffer(unsigned char **zlib_buf, int *zlib_bufsiz)
{
if(*zlib_buf) {
free(*zlib_buf);
*zlib_buf=NULL;
}
*zlib_bufsiz=0;
}
static void _use_msg_for_out(struct message *m)
{
if (m->outbuf)
free(m->outbuf);
m->outbuf = NULL;
m->out = m->msg;
m->out_len = m->msg_len;
}
static int _message_read_raw(int fd, struct message *m)
{
_clear_message(m);
if ((m->raw = malloc(m->max_len + 1)) == NULL)
return EX_OSERR;
m->raw_len = full_read(fd, 1, m->raw, m->max_len + 1, m->max_len + 1);
if (m->raw_len <= 0) {
free(m->raw);
m->raw = NULL;
m->raw_len = 0;
return EX_IOERR;
}
m->type = MESSAGE_ERROR;
if (m->raw_len > (int) m->max_len)
{
libspamc_log(m->priv->flags, LOG_ERR,
"skipped message, greater than max message size (%d bytes)",
m->max_len);
return EX_TOOBIG;
}
m->type = MESSAGE_RAW;
m->msg = m->raw;
m->msg_len = m->raw_len;
m->out = m->msg;
m->out_len = m->msg_len;
return EX_OK;
}
static int _message_read_bsmtp(int fd, struct message *m)
{
unsigned int i, j, p_len;
char prev;
char* p;
_clear_message(m);
if ((m->raw = malloc(m->max_len + 1)) == NULL)
return EX_OSERR;
/* Find the DATA line */
m->raw_len = full_read(fd, 1, m->raw, m->max_len + 1, m->max_len + 1);
if (m->raw_len <= 0) {
free(m->raw);
m->raw = NULL;
m->raw_len = 0;
return EX_IOERR;
}
m->type = MESSAGE_ERROR;
if (m->raw_len > (int) m->max_len)
return EX_TOOBIG;
p = m->pre = m->raw;
/* Search for \nDATA\n which marks start of actual message */
while ((p_len = (m->raw_len - (p - m->raw))) > 8) { /* leave room for at least \nDATA\n.\n */
char* q = memchr(p, '\n', p_len - 8); /* find next \n then see if start of \nDATA\n */
if (q == NULL) break;
q++;
if (((q[0]|0x20) == 'd') && /* case-insensitive ASCII comparison */
((q[1]|0x20) == 'a') &&
((q[2]|0x20) == 't') &&
((q[3]|0x20) == 'a')) {
q+=4;
if (q[0] == '\r') ++q;
if (*(q++) == '\n') { /* leave q at start of message if we found it */
m->msg = q;
m->pre_len = q - m->raw;
m->msg_len = m->raw_len - m->pre_len;
break;
}
}
p = q; /* the above code ensures no other '\n' comes before q */
}
if (m->msg == NULL)
return EX_DATAERR;
/* ensure this is >= 0 */
if (m->msg_len < 0) {
return EX_SOFTWARE;
}
/* Find the end-of-DATA line */
prev = '\n';
for (i = j = 0; i < (unsigned int) m->msg_len; i++) {
if (prev == '\n' && m->msg[i] == '.') {
/* Dot at the beginning of a line */
if (((int) (i+1) == m->msg_len)
|| ((int) (i+1) < m->msg_len && m->msg[i + 1] == '\n')
|| ((int) (i+2) < m->msg_len && m->msg[i + 1] == '\r' && m->msg[i + 2] == '\n')) {
/* Lone dot! That's all, folks */
m->post = m->msg + i;
m->post_len = m->msg_len - i;
m->msg_len = j;
break;
}
else if ((int) (i+1) < m->msg_len && m->msg[i + 1] == '.') {
/* Escaping dot, eliminate. */
prev = '.';
continue;
} /* Else an ordinary dot, drop down to ordinary char handler */
}
prev = m->msg[i];
m->msg[j++] = m->msg[i];
}
/* if bad format with no end "\n.\n", error out */
if (m->post == NULL)
return EX_DATAERR;
m->type = MESSAGE_BSMTP;
m->out = m->msg;
m->out_len = m->msg_len;
return EX_OK;
}
int message_read(int fd, int flags, struct message *m)
{
assert(m != NULL);
libspamc_timeout = 0;
/* create the "private" part of the struct message */
m->priv = malloc(sizeof(struct libspamc_private_message));
if (m->priv == NULL) {
libspamc_log(flags, LOG_ERR, "message_read: malloc failed");
return EX_OSERR;
}
m->priv->flags = flags;
m->priv->alloced_size = 0;
if (flags & SPAMC_PING) {
_clear_message(m);
return EX_OK;
}
switch (flags & SPAMC_MODE_MASK) {
case SPAMC_RAW_MODE:
return _message_read_raw(fd, m);
case SPAMC_BSMTP_MODE:
return _message_read_bsmtp(fd, m);
default:
libspamc_log(flags, LOG_ERR, "message_read: Unknown mode %d",
flags & SPAMC_MODE_MASK);
return EX_USAGE;
}
}
long message_write(int fd, struct message *m)
{
long total = 0;
off_t i, j;
off_t jlimit;
char buffer[1024];
assert(m != NULL);
if (m->priv->flags & (SPAMC_CHECK_ONLY|SPAMC_PING)) {
if (m->is_spam == EX_ISSPAM || m->is_spam == EX_NOTSPAM) {
return full_write(fd, 1, m->out, m->out_len);
}
else {
libspamc_log(m->priv->flags, LOG_ERR, "oops! SPAMC_CHECK_ONLY is_spam: %d",
m->is_spam);
return -1;
}
}
/* else we're not in CHECK_ONLY mode */
switch (m->type) {
case MESSAGE_NONE:
libspamc_log(m->priv->flags, LOG_ERR, "Cannot write this message, it's MESSAGE_NONE!");
return -1;
case MESSAGE_ERROR:
return full_write(fd, 1, m->raw, m->raw_len);
case MESSAGE_RAW:
return full_write(fd, 1, m->out, m->out_len);
case MESSAGE_BSMTP:
total = full_write(fd, 1, m->pre, m->pre_len);
for (i = 0; i < m->out_len;) {
jlimit = (off_t) (sizeof(buffer) / sizeof(*buffer) - 4);
for (j = 0; i < (off_t) m->out_len && j < jlimit;) {
if (i + 1 < m->out_len && m->out[i] == '\n'
&& m->out[i + 1] == '.') {
if (j > jlimit - 4) {
break; /* avoid overflow */
}
buffer[j++] = m->out[i++];
buffer[j++] = m->out[i++];
buffer[j++] = '.';
}
else {
buffer[j++] = m->out[i++];
}
}
total += full_write(fd, 1, buffer, j);
}
return total + full_write(fd, 1, m->post, m->post_len);
default:
libspamc_log(m->priv->flags, LOG_ERR, "Unknown message type %d", m->type);
return -1;
}
}
void message_dump(int in_fd, int out_fd, struct message *m)
{
char buf[8196];
int bytes;
if (m != NULL && m->type != MESSAGE_NONE) {
message_write(out_fd, m);
}
while ((bytes = full_read(in_fd, 1, buf, 8192, 8192)) > 0) {
if (bytes != full_write(out_fd, 1, buf, bytes)) {
libspamc_log(m->priv->flags, LOG_ERR, "oops! message_dump of %d returned different",
bytes);
}
}
}
static int
_spamc_read_full_line(struct message *m, int flags, SSL * ssl, int sock,
char *buf, size_t *lenp, size_t bufsiz)
{
int failureval;
int bytesread = 0;
size_t len;
UNUSED_VARIABLE(m);
*lenp = 0;
/* Now, read from spamd */
for (len = 0; len < bufsiz - 1; len++) {
if (flags & SPAMC_USE_SSL) {
bytesread = ssl_timeout_read(ssl, buf + len, 1);
}
else {
bytesread = fd_timeout_read(sock, 0, buf + len, 1);
}
if (bytesread <= 0) {
failureval = EX_IOERR;
goto failure;
}
if (buf[len] == '\n') {
buf[len] = '\0';
if (len > 0 && buf[len - 1] == '\r') {
len--;
buf[len] = '\0';
}
*lenp = len;
return EX_OK;
}
}
libspamc_log(flags, LOG_ERR, "spamd responded with line of %d bytes, dying", len);
failureval = EX_TOOBIG;
failure:
return failureval;
}
/*
* May 7 2003 jm: using %f is bad where LC_NUMERIC is "," in the locale.
* work around using our own locale-independent float-parser code.
*/
static float _locale_safe_string_to_float(char *buf, int siz)
{
int is_neg;
char *cp, *dot;
int divider;
float ret, postdot;
buf[siz - 1] = '\0'; /* ensure termination */
/* ok, let's illustrate using "100.033" as an example... */
is_neg = 0;
if (*buf == '-') {
is_neg = 1;
}
ret = (float) (strtol(buf, &dot, 10));
if (dot == NULL) {
return 0.0;
}
if (dot != NULL && *dot != '.') {
return ret;
}
/* ex: ret == 100.0 */
cp = (dot + 1);
postdot = (float) (strtol(cp, NULL, 10));
/* note: don't compare floats == 0.0, it's unsafe. use a range */
if (postdot >= -0.00001 && postdot <= 0.00001) {
return ret;
}
/* ex: postdot == 33.0, cp="033" */
/* now count the number of decimal places and figure out what power of 10 to use */
divider = 1;
while (*cp != '\0') {
divider *= 10;
cp++;
}
/* ex:
* cp="033", divider=1
* cp="33", divider=10
* cp="3", divider=100
* cp="", divider=1000
*/
if (is_neg) {
ret -= (postdot / ((float) divider));
}
else {
ret += (postdot / ((float) divider));
}
/* ex: ret == 100.033, tada! ... hopefully */
return ret;
}
static int
_handle_spamd_header(struct message *m, int flags, char *buf, int len,
unsigned int *didtellflags)
{
char is_spam[6];
char s_str[21], t_str[21];
char didset_ret[15];
char didremove_ret[15];
UNUSED_VARIABLE(len);
/* Feb 12 2003 jm: actually, I think sccanf is working fine here ;)
* let's stick with it for this parser.
* May 7 2003 jm: using %f is bad where LC_NUMERIC is "," in the locale.
* work around using our own locale-independent float-parser code.
*/
if (sscanf(buf, "Spam: %5s ; %20s / %20s", is_spam, s_str, t_str) == 3) {
m->score = _locale_safe_string_to_float(s_str, 20);
m->threshold = _locale_safe_string_to_float(t_str, 20);
/* set bounds on these to ensure no buffer overflow in the sprintf */
if (m->score > 1e10)
m->score = 1e10;
else if (m->score < -1e10)
m->score = -1e10;
if (m->threshold > 1e10)
m->threshold = 1e10;
else if (m->threshold < -1e10)