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noip2.c
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noip2.c
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/////////////////////////////////////////////////////////////////////////////
/*
no-ip.com dynamic IP update client for Linux
Copyright 2000-2006 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
written June 2000
by johna@onevista.com
copyright transferred from
One Vista Associates
to
Free Software Foundation, Inc.
October 6, 2000 (johna)
+ November 4, 2000
+ updated noip.c and Makefile to build on solaris also
+ collapsed expanded code into strerror()
+ suggested by rob_nielson@mailandnews.com
+ December 2, 2000
+ updated noip.c to build on BSD also
+ changed #include <linux/if.h> to #include <net/if.h>
+ suggested by ramanan@users.sourceforge.net
+ April 27, 2001 (Stephane Neveu stephane@skylord.org)
+ changed the "SAVEDIPFILE" from /tmp/no-ip_save to
/var/run/no-ip_save
+ added configuration default lookup into /usr/local/etc
if /usr/local/lib doesn't have a configuration file
+ fix output of contextual ourname[hostnum] in the function
handle_dynup_error() instead of the "first" name
+ August 27, 2001 (johna)
+ added GROUP concept
+ removed multiple host/domain name hack (use groups)
+ changed SAVEDIPFILE back to /tmp
(must be root to write in /var/run)
+ November 22, 2002 (johna)
+ changed vsprintf to vsnprintf to avoid buffer overflow
+ Version 2.0 December 2002 (johna -- major rewrite)
+ using shared memory
+ new config file format with autoconfig (-C)
+ multiple instances supported (-M)
+ status available for all instances (-S)
+ can terminate an instance (-K)
+ can toggle debugging for an instance (-D)
+ March 2003 (johna)
+ bumped MAX_NET_DEVS to 24
+ drop root privs after acquiring conf (by Michal Ambroz)
+ added -I interface_name flag (by Clifford Kite)
+ April 2003 (johna)
+ avoid listing IPV6 devices (robc at gmx.de)
+ May 2003 (johna)
+ replaced sleep(x) with select(1,0,0,0,timeout)
+ added getifaddrs() for recent BSD systems (Peter Stromberg)
+ added new SIOCGIFCONF for older BSD systems (Peter Stromberg)
+ November 2003 (johna)
+ added <CR> into all http requests along with <LF>
+ added SIGCHLD handler to reap zombies
+ January 2004 (johna)
+ added location logic and revamped XML parsing
+ added User-Agent field to settings.php request
+ changed to version 2.1
+ January 2004 (johna) version 2.1.1
+ added -u, -p and -x options for LR101 project
+ April 2004 (johna version 2.1.2
+ removed -Y in make install rule
+ August 2005 (johna) version 2.1.3
+ added shm dump code for debugging broken libraries
+ added -z flag to invoke shm dump code
+ February 2006 (johna) version 2.1.4
+ added code to handle new pedantic version of gcc
+ made signed/unsigned char assignments explicit
+ February 21, 2007 - djonas version 2.1.5
+ updated noip2.c: added SkipHeaders() instead of the magic 6 line pass
+ Changed to ip1.dynupdate.no-ip.com for ip retrieval
+ August 2007 (johna) version 2.1.6
+ added fclose() for stdin, stdout & stderr to child
+ made Force_Update work on 30 day intervals
+ August 2007 (johna) version 2.1.7
+ fixed bug introduced in 2.1.6 where errors from multiple
+ instances were not diplayed due to stderr being closed
+ added version number into shared mem and -S display
+ December 2007 (johna) version 2.1.8 (not generally released)
+ reworked forced update code to use 'wget' and the
+ hostactivate.php script at www.no-ip.com
+ I discovered that no-ip.com still sent warning email
+ about unused hosts when their address had not changed even
+ though they had been updated two days ago by this program!
+ November 2008 (johna) still version 2.1.8
+ added check of returned IP address in get_our_visble_IP_addr
+ hardened GetNextLine to prevent possible buffer overflow
+ ... exploit claimed by J. Random Cracker but never demonstrated
+ it relied on DNS subversion and buffer overflow
+ November 2008 (johna) version 2.1.9
+ hardened force_update() to prevent possible buffer overflow
+ hardened autoconf() the same way
+ patch suggested by xenomuta@phreaker.net
*/
/////////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <assert.h>
#include <termios.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <pwd.h>
#include <time.h>
#ifdef bsd_with_getifaddrs
#include <ifaddrs.h>
#include <net/if_types.h>
#endif
#ifdef bsd
#include <sys/sockio.h>
#include <net/if_types.h>
#endif
#ifdef linux
#ifndef SIOCGIFADDR
#include <linux/sockios.h>
#endif
#endif
#ifdef sun
#include <sys/sockio.h>
#endif
#define DEBUG
#define ENCRYPT 1
#define FORCE_UPDATE 0
#define MAX(x,y) (((x)>(y))?(x):(y))
#define READ_TIMEOUT 90
#define WRITE_TIMEOUT 60
#define CONNECT_TIMEOUT 60
#define FORCE_INTERVAL (1440 * 30) // 30 days in minutes
#define IPLEN 16
#define LINELEN 256
#define BIGBUFLEN 16384
#define NOIP_NAME "dynupdate.no-ip.com"
#define UPD_NAME "www.no-ip.com"
#define UPD_SCRIPT "hostactive.php"
#define NOIP_IP_SCRIPT "ip1.dynupdate.no-ip.com"
#define CLIENT_IP_PORT 8245
#define VERSION "2.1.9"
#define USER_AGENT "User-Agent: Linux-DUC/"VERSION
#define SETTING_SCRIPT "settings.php?"
#define USTRNG "username="
#define PWDSTRNG "&pass="
#if ENCRYPT
#define REQUEST "requestL="
#else
#define REQUEST ""
#endif
#define UPDATE_SCRIPT "ducupdate.php"
#ifdef DEBUG
#define OPTCHARS "CYU:Fc:dD:hp:u:x:SMi:K:I:z"
#else
#define OPTCHARS "CYU:Fc:hp:u:x:SMi:K:I:z"
#endif
#define ARGC 1
#define ARGF (1<<1)
#define ARGY (1<<2)
#define ARGU (1<<3)
#define ARGI (1<<4)
#define ARGu (1<<5)
#define ARGp (1<<6)
#define ARGx (1<<7)
#define ARGD (1<<8)
#define ARGS (1<<9)
#define ARGM (1<<10)
#define ARGK (1<<11)
#define ARGi (1<<12)
#define NODNSGROUP "@@NO_GROUP@@"
#define HOST 1
#define GROUP 2
#define DOMAIN 3
#ifndef PREFIX
#define PREFIX "/usr/local"
#endif
#define CONFIG_FILEPATH PREFIX"/etc"
#define CONFIG_FILENAME PREFIX"/etc/no-ip2.conf"
#define CONFSTRLEN 1024
#define MAX_DEVLEN 16
#define MAX_INSTANCE 4
#define MAX_NET_DEVS 48
#define B64MOD 4
#define CONFIG_MAGIC 0x414a324c
#define NOIP_KEY 0x50494f4e
#define SHMEM_SIZE (MAX_INSTANCE * sizeof(struct INSTANCE))
#define DEFAULT_NAT_INTERVAL 30
#define WGET_PGM "/usr/bin/wget"
#define SPACE ' '
#define EQUALS '='
#define COMMENT '#'
#define COMMA ','
#define ALREADYSET 0
#define SUCCESS 1
#define BADHOST 2
#define BADPASSWD 3
#define BADUSER 4
#define TOSVIOLATE 6
#define PRIVATEIP 7
#define HOSTDISABLED 8
#define HOSTISREDIRECT 9
#define BADGRP 10
#define SUCCESSGRP 11
#define ALREADYSETGRP 12
#define RELEASEDISABLED 99
#define UNKNOWNERR -1
#define FATALERR -1
#define NOHOSTLOOKUP -2
#define SOCKETFAIL -3
#define CONNTIMEOUT -4
#define CONNFAIL -5
#define READTIMEOUT -6
#define READFAIL -7
#define WRITETIMEOUT -8
#define WRITEFAIL -9
#define NOCONFIG -10
#define BADCONFIG1 -11
#define BADCONFIG2 -12
#define BADCONFIG3 -13
#define BADCONFIG4 -14
#define BADCONFIG5 -15
#define BADCONFIG6 -16
#define BADACTIVATE -20
#define CMSG01 "Can't locate configuration file %s. (Try -c). Ending!\n"
#define CMSG02 "'%s' is a badly constructed configuration file. Ending!\n"
#define CMSG03 "'%s' is not a valid configuration file. Ending!\n"
#define CMSG04 "Request elements unreadable in '%s'. Ending!\n"
#define CMSG05 "Checksum error in '%s'. Ending!\n"
#define CMSG06 "No hosts are available for this user."
#define CMSG07 "Go to www.no-ip.com and create some!\n"
#define CMSG08 "Configuration file can NOT be created.\n"
#define CMSG09 "You have entered an incorrect username"
#define CMSG10 "\t-or-"
#define CMSG11 "an incorrect password for this username."
#define CMSG12 "Only one host [%s] is registered to this account."
#define CMSG13 "It will be used."
#define CMSG14 "Only one group [%s] is registered to this account."
#define CMSG16 "Too many hosts and/or groups!"
#define CMSG17 "Please consolidate via www.no-ip.com"
#define CMSG18 "Can't find network device names! Ending\n"
#define CMSG19 "No network devices found! Ending."
#define CMSG20 "Multiple network devices have been detected.\n"
#define CMSG21 "Please select the Internet interface from this list.\n"
#define CMSG22 "By typing the number associated with it."
#define CMSG23 "Too many network devices. Limit is %d"
#define CMSG24 "\nAuto configuration for Linux client of no-ip.com.\n"
#define CMSG25 "Can't create config file (%s)"
#define CMSG25a "Re-run noip, adding '-c configfilename' as a parameter."
#define CMSG26 "Can't rename config file (%s)"
#define CMSG27 "Network must be operational to create configfile. Ending!"
#define CMSG28 "\nNew configuration file '%s' created.\n"
#define CMSG29 "Nothing selected. Configuration file '%s' NOT created.\n"
#define CMSG30 "Please enter the login/email string for no-ip.com "
#define CMSG31 "Please enter the password for user '%s' "
#define CMSG32 " are registered to this account.\n"
#define CMSG33 "Do you wish to have them all updated?[N] (y/N) "
#define CMSG34 "Do you wish to have group [%s] updated?[N] (y/N) "
#define CMSG35 "Do you wish to have host [%s] updated?[N] (y/N) "
#define CMSG36 "Empty request list in '%s'. Ending!"
#define CMSG37 "No hosts or groups are registered to this account.\n"
#define CMSG38 "Please enter an update interval:[%d] "
#define CMSG39 "\nConfiguration file '%s' is in use by process %d.\nEnding!\n"
#define CMSG40 "Do you wish to run something at successful update?[N] (y/N) "
#define CMSG40a "Please enter the script/program name "
#define CMSG41 "Exec path unreadable in '%s'. Ending!\n"
#define CMSG42 "Can't get our visible IP address from %s"
#define CMSG43 "Invalid domain name '%s'"
#define CMSG44 "Invalid host name '%s'"
#define CMSG99 "\nThis client has expired. Please go to http://www.no-ip.com/downloads.php"
#define CMSG99a "to get our most recent version.\n"
#define CMSG100 \
"Error! -C option can only be used with -F -Y -U -I -c -u -p -x options."
#define CMSG101 " Both -u and -p options must be used together."
int debug = 0;
int timed_out = 0;
int background = 1; // new default
int port_to_use = CLIENT_IP_PORT;
int socket_fd = -1;
int config_fd = -1;
int nat = 0;
int interval = 0;
int log2syslog = 0;
int connect_fail = 0;
int offset = 0;
int needs_conf = 0;
int firewallbox = 0;
int forceyes = 0;
int update_cycle = 0;
int show_config = 0;
int shmid = 0;
int multiple_instances = 0;
int debug_toggle = 0;
int kill_proc = 0;
int reqnum = 0;
int prompt_for_executable = 1;
int shm_dump_active = 0;
int Force_Update = FORCE_INTERVAL;
int dummy = 0;
void *shmaddr = NULL;
char *program = NULL;
char *ourname = NULL;
char tmp_filename[LINELEN] = "/tmp/NO-IPXXXXXX";
char *config_filename = NULL;
char *request = NULL;
char *pid_path = NULL;
char *execpath = NULL;
char *supplied_username = NULL;
char *supplied_password = NULL;
char *supplied_executable = NULL;
char IPaddress[IPLEN];
char login[LINELEN];
char password[LINELEN];
char device[LINELEN];
char iface[MAX_DEVLEN];
char dmn[LINELEN];
char answer[LINELEN];
char saved_args[LINELEN];
char buffer[BIGBUFLEN];
struct termios argin, argout;
struct sigaction sig;
struct CONFIG {
char lastIP[IPLEN];
ushort interval; // don't move this (see display_current_config)
ushort chksum;
uint magic;
ushort rlength;
ushort elength;
char count;
char encrypt;
char nat;
char filler;
char device[MAX_DEVLEN];
char requests[0];
char execpath[0];
} *new_config = NULL;
#define CHKSUM_SKIP (sizeof(ushort) + sizeof(ushort) + IPLEN)
int ignore(char *p);
int domains(char *p);
int hosts(char *p);
int xmlerr(char *p);
struct SETTINGS {
int len;
char *keyword;
int (*func)(char *);
} settings[] = {
{ 7, "<domain", domains },
{ 5, "<host", hosts },
{ 1, "<", ignore }, // other objects
{ 0, "", xmlerr } // error msgs
};
struct GROUPS {
char *grp;
int use;
int count;
int ncount;
struct GROUPS *glink;
struct NAMES *nlink;
} *groups = NULL;
struct NAMES {
int use;
char *fqdn;
struct NAMES *link;
} *ns = NULL;
struct INSTANCE {
int pid;
char debug;
char version;
short interval;
char Last_IP_Addr[IPLEN];
char cfilename[LINELEN];
char args[LINELEN - (2 *IPLEN)];
} *my_instance = NULL;
struct SHARED {
struct INSTANCE instance[MAX_INSTANCE];
char banned_version[16];
} *shared = NULL;
unsigned char DecodeTable[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, 0, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
};
unsigned char EncodeTable[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
///////////////////////////////////////////////////////////////////////////
void process_options(int argc, char *argv[]);
void update_handler(int signum);
void alarm_handler(int signum);
void sigchld_handler(int signum);
void exit_handler(int signum);
void wake_handler(int signum);
char put_version(char *ver);
char *get_version(unsigned char x);
void save_IP();
void dump_shm(struct shmid_ds *d);
int get_shm_info();
int validate_IP_addr(char *src, char *dest);
void get_our_visible_IPaddr(char *dest);
void getip(char *dest, char *device);
int run_as_background();
int Sleep(int seconds);
int Read(int sock, char *buf, size_t count);
int Write(int fd, char *buf, size_t count);
int Connect(int port);
int converse_with_web_server();
char *despace(char *p);
char url_decode(char *p);
void get_one_config(char *name);
void display_current_config();
void display_one_config(char *req, int interval,
int nat, char *device, char *expath);
int parse_config();
ushort chksum(char *buf, unsigned int size);
void dump_buffer(int x);
int dynamic_update();
int validate_name(int flag, char *name);
int force_update();
int handle_dynup_error(int error_code);
int handle_config_error(int err_code);
void *Malloc(int size);
int get_xml_field(char *name, char *line, char *dest);
void add_to_list(char *gnm, struct NAMES *ns);
int yesno(char *fmt, ...);
int add_to_request(int kind, char *p);
int get_update_selection(int tgrp, int thst);
int GetNextLine(char *dest);
void SkipHeaders();
void url_encode(char *in, char *out);
void get_credentials(char *l, char *p);
void get_device_name(char *d);
void autoconf();
int bencode(const char *s, char *dst);
int bdecode(char *in, char *out);
void Msg(char *fmt, ...);
///////////////////////////////////////////////////////////////////////////
void Usage()
{
fprintf(stderr, "\nUSAGE: %s ", program);
fprintf(stderr, "[ -C [ -F][ -Y][ -U #min]\n\t");
fprintf(stderr, "[ -u username][ -p password][ -x progname]]\n\t");
fprintf(stderr, "[ -c file]");
#ifdef DEBUG
fprintf(stderr, "[ -d][ -D pid]");
#endif
fprintf(stderr, "[ -i addr][ -S][ -M][ -h]");
fprintf(stderr, "\n\nVersion Linux-%s\n", VERSION);
fprintf(stderr, "Options: -C create configuration data\n");
fprintf(stderr, " -F force NAT off\n");
fprintf(stderr, " -Y select all hosts/groups\n");
fprintf(stderr, " -U minutes set update interval\n");
fprintf(stderr, " -u username use supplied username\n");
fprintf(stderr, " -p password use supplied password\n");
fprintf(stderr, " -x executable use supplied executable\n");
fprintf(stderr, " -c config_file use alternate data path\n");
#ifdef DEBUG
fprintf(stderr, " -d increase debug verbosity\n");
fprintf(stderr, " -D processID toggle debug flag for PID\n");
#endif
fprintf(stderr, " -i IPaddress use supplied address\n");
fprintf(stderr, " -I interface use supplied interface\n");
fprintf(stderr, " -S show configuration data\n");
fprintf(stderr, " -M permit multiple instances\n");
fprintf(stderr, " -K processID terminate instance PID\n");
fprintf(stderr, " -z activate shm dump code\n");
fprintf(stderr, " -h help (this text)\n");
}
///////////////////////////////////////////////////////////////////////////
int main(int argc, char *argv[])
{
char *p;
struct passwd *nobody;
port_to_use = CLIENT_IP_PORT;
timed_out = 0;
sig.sa_flags = 0;
sigemptyset(&sig.sa_mask);
sig.sa_handler = SIG_IGN;
sigaction(SIGHUP,&sig,NULL);
sigaction(SIGPIPE,&sig,NULL);
sigaction(SIGUSR1,&sig,NULL);
sigaction(SIGUSR2,&sig,NULL);
sig.sa_handler = alarm_handler;
sigaction(SIGALRM,&sig,NULL);
p = strrchr(argv[0], '/');
if (p)
program = ++p;
else
program = argv[0];
openlog(program, LOG_PID, LOG_DAEMON);
if ((p = realpath(program, buffer)) == NULL) {
p = program;
}
sprintf(saved_args, "%s", p);
*iface = 0; // no supplied interface yet
process_options(argc, argv);
if (config_filename == NULL)
config_filename = CONFIG_FILENAME;
if (needs_conf) {
autoconf();
exit(0);
}
if (handle_config_error(parse_config()) != SUCCESS)
return -1;
/* drop root privileges after reading config */
if (geteuid() == 0) {
if ((nobody = getpwnam("nobody")) != NULL) { // if "nobody" exists
setgid(nobody->pw_gid);
setegid(nobody->pw_gid);
setuid(nobody->pw_uid);
seteuid(nobody->pw_uid);
}
}
if (*IPaddress != 0) {
if (background) {
Msg("IP address detected on command line.");
Msg("Running in single use mode.");
background = 0;
multiple_instances++; // OK to have another running
}
}
if (background) {
sig.sa_handler = (void *)wake_handler;
sigaction(SIGUSR1,&sig,NULL);
sig.sa_handler = update_handler;
sigaction(SIGUSR2,&sig,NULL);
sig.sa_handler = exit_handler;
sigaction(SIGINT,&sig,NULL);
sigaction(SIGTERM,&sig,NULL);
sigaction(SIGQUIT,&sig,NULL);
sig.sa_handler = (void *)sigchld_handler;
sigaction(SIGCHLD, &sig, NULL);
if (run_as_background() == FATALERR) { // get shmem failure
return FATALERR;
}
} else {
if (get_shm_info() == FATALERR)
return FATALERR;
if (*IPaddress == 0) {
if (nat)
//get_our_visible_IPaddr(IPaddress);
getip(IPaddress, device);
else
getip(IPaddress, device);
}
if (*IPaddress == 0) {
Msg("Not connected to Net!");
my_instance->pid = 0; // untag instance
shmdt(shmaddr); // done with our shared memory
return FATALERR;
}
if (dynamic_update() != SUCCESS) {
my_instance->pid = 0; // untag instance
shmdt(shmaddr); // done with our shared memory
return FATALERR;
}
strncpy(my_instance->Last_IP_Addr, IPaddress, IPLEN);
}
save_IP();
free(new_config);
free(request);
return 0;
}
///////////////////////////////////////////////////////////////////////////
void process_options(int argc, char *argv[])
{
extern int optind, opterr;
extern char *optarg;
int c, have_args = 0;
while ((c = getopt(argc, argv, OPTCHARS)) != EOF) {
switch (c) {
case 'C':
needs_conf++;
log2syslog = -1;
have_args |= ARGC;
break;
case 'F':
firewallbox++;
have_args |= ARGF;
break;
case 'Y':
forceyes++;
have_args |= ARGY;
break;
case 'U':
update_cycle = atoi(optarg);
have_args |= ARGU;
break;
case 'c':
config_filename = optarg;
strcat(saved_args, " -c ");
strcat(saved_args, optarg);
break;
#ifdef DEBUG
case 'd':
debug++;
log2syslog = -1;
shm_dump_active++;
strcat(saved_args, " -d");
break;
case 'D':
debug_toggle = atoi(optarg);
have_args |= ARGD;
break;
#endif
case 'u':
supplied_username = optarg;
have_args |= ARGu;
break;
case 'p':
supplied_password = optarg;
have_args |= ARGp;
break;
case 'x':
supplied_executable = optarg;
have_args |= ARGx;
break;
case 'h':
Usage();
exit(0);
case 'S':
show_config++;
log2syslog = -1;
have_args |= ARGS;
break;
case 'M':
multiple_instances++;
have_args |= ARGM;
break;
case 'K':
kill_proc = atoi(optarg);
have_args |= ARGK;
break;
case 'i':
strcpy(IPaddress, optarg);
strcat(saved_args, " -i ");
strcat(saved_args, optarg);
have_args |= ARGi;
break;
case 'I':
strcpy(iface, optarg);
strcat(saved_args, " -I ");
strcat(saved_args, optarg);
have_args |= ARGI;
break;
case 'z':
shm_dump_active++;
break;
default:
Usage();
exit(0);
}
}
if (needs_conf && (have_args > ((ARGx * 2) - 1))){
Msg(CMSG100);
exit(1);
}
if (have_args & ARGu) {
if (!(have_args & ARGp)) {
Msg(CMSG101);
exit(1);
}
}
if (have_args & ARGp) {
if (!(have_args & ARGu)) {
Msg(CMSG101);
exit(1);
}
prompt_for_executable = 0; // don't prompt in auto mode
}
if (debug_toggle && (have_args != ARGD)){
Msg("Error! -D option can't be used with any other options.");
exit(1);
}
if (kill_proc && (have_args != ARGK)){
Msg("Error! -K option can't be used with any other options.");
exit(1);
}
if (show_config && (have_args != ARGS)){
Msg("Error! -S option can't be used with any other options.");
exit(1);
}
if (argc - optind) {
Usage();
exit(1);
}
return;
}
///////////////////////////////////////////////////////////////////////////
void update_handler(int signum) // entered on SIGUSR2
{
Force_Update = -1;
}
///////////////////////////////////////////////////////////////////////////
void alarm_handler(int signum) // entered on SIGALRM
{
timed_out = 1;
}
///////////////////////////////////////////////////////////////////////////
void sigchld_handler(int signum) //entered on death of child (SIGCHLD)
{
int status;
waitpid(-1, &status, WNOHANG | WUNTRACED);
}
///////////////////////////////////////////////////////////////////////////
void exit_handler(int signum) //entered on SIGINT, SIGTERM & SIGQUIT
{
background = 0;
// don't reset handler -- exit on second signal
}
///////////////////////////////////////////////////////////////////////////
void wake_handler(int signum) //entered on SIGUSR1
{ // used to wake sleeping process only
dummy++;
}
///////////////////////////////////////////////////////////////////////////
char put_version(char *ver)
{
char *p, x;
p = ver + 2; // step over 2.
x = (*p -'0') * 10; // get major num
p += 2;
x += (*p -'0'); // get minor num
return x;
}
///////////////////////////////////////////////////////////////////////////
char *get_version(unsigned char z)
{
int x, y;
static char vers[10];
if (z > 15) {
x = z / 10;
y = z % 10;
sprintf(vers, "2.%d.%d", x, y);
} else {
strcpy(vers, "unknown");
}
return vers;
}
///////////////////////////////////////////////////////////////////////////
void save_IP()
{
// config_file is opened as root, read-only permission has no effect
if (access(config_filename, W_OK) ==0) {
lseek(config_fd, 0, SEEK_SET); // re-position at start of file
write(config_fd, my_instance->Last_IP_Addr,
strlen(my_instance->Last_IP_Addr) + 1);
#ifdef DEBUG
if (my_instance->debug)
Msg("Saving Last_IP_Addr %s", my_instance->Last_IP_Addr);
} else {
if (my_instance->debug)
Msg("Read-only file '%s' prevents saving Last_IP_Addr %s",
config_filename, my_instance->Last_IP_Addr);
#endif
}
close(config_fd);
my_instance->pid = 0; // untag instance
shmdt(shmaddr); // done with our shared memory
exit(0);
}
///////////////////////////////////////////////////////////////////////////
void getip(char *p, char *device)
{
int fd;
struct sockaddr_in *sin;
struct ifreq ifr;
struct in_addr z;
*p = 0; // remove old address
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
Msg("Can't talk to kernel! (%d)\n", errno);
return;
}
strcpy(ifr.ifr_name, device);
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
Msg("Can't get status for %s. (%d)\n", device, errno);
close(fd);
return;
}
if ((ifr.ifr_flags & IFF_UP) == 0) {
// No longer print message when interface down (johna 6-28-00)
// Msg("Interface %s not active.\n", device);
close(fd);
return;
}
if (ioctl(fd, SIOCGIFADDR, &ifr) != 0) {
Msg("Can't get IP address for %s. (%d)\n", device, errno);
close(fd);
return;
}
close(fd);
sin = (struct sockaddr_in *)&ifr.ifr_addr;
z = sin->sin_addr;
//printf("THE IP ISSSSSS!!!!!!!!!!!!!: %lu\n", z.s_addr);
strcpy(p, inet_ntoa(z));
//printf("THE IP ISSSSSS!!!!!!!!!!!!!: %s\n", p);
#ifdef DEBUG
if (my_instance ? my_instance->debug : debug)
fprintf(stderr,"! Our IP address is %s\n", p);
#endif
}
/////////////////////////////////////////////////////////////////////////
int config_file_inuse()
{
int i, retval, xid;
void *xaddr;
struct INSTANCE *is;
struct SHARED *shr;
if ((xid = shmget(NOIP_KEY, SHMEM_SIZE, 0)) == -1)
return 0;
if ((xaddr = shmat(xid, 0, 0)) == (void *)-1)
return 0;
retval = 0;
shr = (struct SHARED *)xaddr;
for (i=0; i<MAX_INSTANCE; i++) {
is = &shr->instance[i];
if (is->pid != 0) {
if (strcmp(is->cfilename, config_filename) == 0) {
if (kill(is->pid, 0) == 0) { // does process exist?
retval = is->pid; // file in use
break;
}
}
}
}
shmdt(xaddr);
return retval;
}
/////////////////////////////////////////////////////////////////////////
void dump_shm(struct shmid_ds *d)
{
if (shm_dump_active) {
fprintf(stderr, "\nShared memory info:\n");
fprintf(stderr, "\tsize of struct shmid_ds is %d\n", (int)sizeof(struct shmid_ds));
fprintf(stderr, "\tmode %o\n", d->shm_perm.mode & 0x1ff);
fprintf(stderr, "\tuid %d, gid %d\n",
d->shm_perm.uid, d->shm_perm.gid);
fprintf(stderr, "\tcreated by uid %d, gid %d\n",
d->shm_perm.cuid, d->shm_perm.cgid);
fprintf(stderr, "\tsegment size = %d\n", (int)d->shm_segsz);
fprintf(stderr, "\tlast attach time = %s", ctime(&d->shm_atime));
fprintf(stderr, "\tlast detach time = %s", ctime(&d->shm_dtime));
fprintf(stderr, "\tcreation time = %s", ctime(&d->shm_ctime));
fprintf(stderr, "\tnumber of attached procs = %d\n", (int)d->shm_nattch);
fprintf(stderr, "\tcreation process id = %d\n", d->shm_cpid);
fprintf(stderr, "\tlast user process id = %d\n", d->shm_lpid);
}
}
/////////////////////////////////////////////////////////////////////////
int get_shm_info()
{
int i, flag;
struct shmid_ds ds;
struct INSTANCE *is;
flag = IPC_CREAT | 0666;
if ((shmid = shmget(NOIP_KEY, SHMEM_SIZE, flag)) == -1) {
Msg("Can't get shared memory. (%s) Ending!", strerror(errno));
return FATALERR;
}
if (shmctl(shmid, IPC_STAT, &ds) != 0) {
Msg("Can't stat shared memory. (%s) Ending!", strerror(errno));
return FATALERR;
}
if ((ds.shm_nattch > 0) && (!multiple_instances)) {
Msg("One %s process is already active,", program);
Msg("and the multiple instance flag (-M) is not set.");
dump_shm(&ds);
return FATALERR;
}
if (ds.shm_nattch >= MAX_INSTANCE) {
Msg("Too many %s processes active. Ending!", program);
dump_shm(&ds);
return FATALERR;
}
if ((shmaddr = shmat(shmid, 0, 0)) == (void *)-1) {
Msg("Can't attach shared memory. (%s) Ending!", strerror(errno));
dump_shm(&ds);
return FATALERR;
}
shared = (struct SHARED *)shmaddr;
if (strcmp(shared->banned_version, VERSION) == 0) {
Msg(CMSG99);
Msg(CMSG99a);
shmdt(shmaddr);
shared = NULL;
return FATALERR;
}
for (i=0; i<MAX_INSTANCE; i++) {
is = &shared->instance[i];
if (is->pid != 0) {
if (strcmp(is->cfilename, config_filename) == 0) {
if (kill(is->pid, 0) == -1) { // does process exist?
if (errno == ESRCH) { // no
Msg("Recovering dead process %d shmem slot", is->pid);
my_instance = is; // take over slot
break;
}
}
if (!background && *IPaddress) { // update running daemon
strncpy(is->Last_IP_Addr, IPaddress, IPLEN);
continue;