1 | /********************************************************************\ |
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2 | * BitlBee -- An IRC to other IM-networks gateway * |
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3 | * * |
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4 | * Copyright 2002-2012 Wilmer van der Gaast and others * |
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5 | \********************************************************************/ |
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6 | |
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7 | /* Main file (Unix specific part) */ |
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8 | |
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9 | /* |
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10 | This program is free software; you can redistribute it and/or modify |
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11 | it under the terms of the GNU General Public License as published by |
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12 | the Free Software Foundation; either version 2 of the License, or |
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13 | (at your option) any later version. |
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14 | |
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15 | This program is distributed in the hope that it will be useful, |
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16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 | GNU General Public License for more details. |
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19 | |
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20 | You should have received a copy of the GNU General Public License with |
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21 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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22 | if not, write to the Free Software Foundation, Inc., 51 Franklin St., |
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23 | Fifth Floor, Boston, MA 02110-1301 USA |
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24 | */ |
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25 | |
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26 | #include "bitlbee.h" |
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27 | |
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28 | #include "arc.h" |
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29 | #include "base64.h" |
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30 | #include "commands.h" |
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31 | #include "protocols/nogaim.h" |
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32 | #include "help.h" |
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33 | #include "ipc.h" |
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34 | #include "md5.h" |
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35 | #include "misc.h" |
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36 | #include <signal.h> |
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37 | #include <unistd.h> |
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38 | #include <sys/time.h> |
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39 | #include <sys/wait.h> |
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40 | #include <pwd.h> |
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41 | #include <locale.h> |
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42 | #include <grp.h> |
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43 | |
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44 | #if defined(OTR_BI) || defined(OTR_PI) |
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45 | #include "otr.h" |
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46 | #endif |
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47 | |
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48 | #ifdef HAVE_BACKTRACE |
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49 | #include <execinfo.h> |
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50 | #endif |
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51 | |
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52 | global_t global; /* Against global namespace pollution */ |
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53 | |
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54 | static struct { |
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55 | int fd[2]; |
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56 | int tag; |
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57 | } shutdown_pipe = {{-1 , -1}, 0}; |
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58 | |
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59 | static void sighandler_shutdown(int signal); |
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60 | static void sighandler_crash(int signal); |
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61 | |
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62 | static int crypt_main(int argc, char *argv[]); |
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63 | |
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64 | int main(int argc, char *argv[]) |
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65 | { |
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66 | int i = 0; |
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67 | char *old_cwd = NULL; |
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68 | struct sigaction sig, old; |
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69 | #ifdef HAVE_BACKTRACE |
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70 | void *unused[1]; |
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71 | #endif |
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72 | |
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73 | /* Required to make iconv to ASCII//TRANSLIT work. This makes BitlBee |
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74 | system-locale-sensitive. :-( */ |
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75 | setlocale(LC_CTYPE, ""); |
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76 | |
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77 | if (argc > 1 && strcmp(argv[1], "-x") == 0) { |
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78 | return crypt_main(argc, argv); |
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79 | } |
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80 | |
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81 | log_init(); |
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82 | /* Catch early errors */ |
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83 | log_link(LOGLVL_ERROR, LOGOUTPUT_CONSOLE); |
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84 | log_link(LOGLVL_WARNING, LOGOUTPUT_CONSOLE); |
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85 | |
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86 | global.conf_file = g_strdup(CONF_FILE_DEF); |
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87 | global.conf = conf_load(argc, argv); |
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88 | if (global.conf == NULL) { |
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89 | return(1); |
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90 | } |
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91 | |
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92 | if (global.conf->runmode == RUNMODE_INETD) { |
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93 | log_link(LOGLVL_ERROR, LOGOUTPUT_IRC); |
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94 | log_link(LOGLVL_WARNING, LOGOUTPUT_IRC); |
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95 | } else { |
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96 | log_link(LOGLVL_ERROR, LOGOUTPUT_CONSOLE); |
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97 | log_link(LOGLVL_WARNING, LOGOUTPUT_CONSOLE); |
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98 | } |
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99 | |
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100 | b_main_init(); |
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101 | |
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102 | /* libpurple doesn't like fork()s after initializing itself, so if |
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103 | we use it, do this init a little later (in case we're running in |
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104 | ForkDaemon mode). */ |
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105 | #ifndef WITH_PURPLE |
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106 | nogaim_init(); |
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107 | #endif |
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108 | |
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109 | #ifdef OTR_BI |
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110 | otr_init(); |
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111 | #endif |
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112 | |
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113 | global.helpfile = g_strdup(HELP_FILE); |
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114 | if (help_init(&global.help, global.helpfile) == NULL) { |
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115 | log_message(LOGLVL_WARNING, "Error opening helpfile %s.", HELP_FILE); |
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116 | } |
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117 | |
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118 | global.storage = storage_init(global.conf->primary_storage, global.conf->migrate_storage); |
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119 | if (global.storage == NULL) { |
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120 | log_message(LOGLVL_ERROR, "Unable to load storage backend '%s'", global.conf->primary_storage); |
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121 | return(1); |
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122 | } |
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123 | |
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124 | global.auth = auth_init(global.conf->auth_backend); |
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125 | if (global.conf->auth_backend && global.auth == NULL) { |
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126 | log_message(LOGLVL_ERROR, "Unable to load authentication backend '%s'", global.conf->auth_backend); |
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127 | return(1); |
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128 | } |
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129 | |
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130 | if (global.conf->runmode == RUNMODE_INETD) { |
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131 | i = bitlbee_inetd_init(); |
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132 | log_message(LOGLVL_INFO, "%s %s starting in inetd mode.", PACKAGE, BITLBEE_VERSION); |
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133 | |
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134 | } else if (global.conf->runmode == RUNMODE_DAEMON) { |
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135 | i = bitlbee_daemon_init(); |
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136 | log_message(LOGLVL_INFO, "%s %s starting in daemon mode.", PACKAGE, BITLBEE_VERSION); |
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137 | } else if (global.conf->runmode == RUNMODE_FORKDAEMON) { |
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138 | /* In case the operator requests a restart, we need this. */ |
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139 | old_cwd = g_malloc(256); |
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140 | if (getcwd(old_cwd, 255) == NULL) { |
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141 | log_message(LOGLVL_WARNING, "Could not save current directory: %s", strerror(errno)); |
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142 | g_free(old_cwd); |
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143 | old_cwd = NULL; |
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144 | } |
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145 | |
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146 | i = bitlbee_daemon_init(); |
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147 | log_message(LOGLVL_INFO, "%s %s starting in forking daemon mode.", PACKAGE, BITLBEE_VERSION); |
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148 | } |
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149 | if (i != 0) { |
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150 | return(i); |
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151 | } |
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152 | |
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153 | if ((global.conf->user && *global.conf->user) && |
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154 | (global.conf->runmode == RUNMODE_DAEMON || |
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155 | global.conf->runmode == RUNMODE_FORKDAEMON) && |
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156 | (!getuid() || !geteuid())) { |
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157 | struct passwd *pw = NULL; |
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158 | pw = getpwnam(global.conf->user); |
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159 | if (!pw) { |
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160 | log_message(LOGLVL_ERROR, "Failed to look up user %s.", global.conf->user); |
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161 | return(EXIT_FAILURE); |
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162 | |
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163 | } else if (initgroups(global.conf->user, pw->pw_gid) != 0) { |
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164 | log_message(LOGLVL_ERROR, "initgroups: %s.", strerror(errno)); |
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165 | return(EXIT_FAILURE); |
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166 | |
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167 | } else if (setgid(pw->pw_gid) != 0) { |
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168 | log_message(LOGLVL_ERROR, "setgid(%d): %s.", pw->pw_gid, strerror(errno)); |
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169 | return(EXIT_FAILURE); |
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170 | |
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171 | } else if (setuid(pw->pw_uid) != 0) { |
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172 | log_message(LOGLVL_ERROR, "setuid(%d): %s.", pw->pw_uid, strerror(errno)); |
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173 | return(EXIT_FAILURE); |
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174 | } |
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175 | } |
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176 | |
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177 | /* Catch some signals to tell the user what's happening before quitting */ |
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178 | memset(&sig, 0, sizeof(sig)); |
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179 | sig.sa_handler = SIG_IGN; |
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180 | sigaction(SIGCHLD, &sig, &old); |
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181 | sigaction(SIGPIPE, &sig, &old); |
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182 | sig.sa_flags = SA_RESETHAND; |
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183 | sig.sa_handler = sighandler_crash; |
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184 | sigaction(SIGSEGV, &sig, &old); |
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185 | |
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186 | sighandler_shutdown_setup(); |
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187 | |
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188 | sig.sa_handler = sighandler_shutdown; |
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189 | sigaction(SIGINT, &sig, &old); |
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190 | sigaction(SIGTERM, &sig, &old); |
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191 | |
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192 | #ifdef HAVE_BACKTRACE |
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193 | /* As per the backtrace(3) man page, call this outside of the signal |
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194 | * handler once to ensure any dynamic libraries are loaded in an |
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195 | * async-signal-safe environment to prevent deadlocks */ |
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196 | backtrace(unused, 1); |
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197 | #endif |
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198 | |
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199 | if (!getuid() || !geteuid()) { |
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200 | log_message(LOGLVL_WARNING, "BitlBee is running with root privileges. Why?"); |
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201 | } |
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202 | |
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203 | b_main_run(); |
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204 | |
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205 | /* Mainly good for restarting, to make sure we close the help.txt fd. */ |
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206 | help_free(&global.help); |
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207 | |
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208 | if (global.restart) { |
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209 | char *fn = ipc_master_save_state(); |
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210 | char *env; |
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211 | |
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212 | env = g_strdup_printf("_BITLBEE_RESTART_STATE=%s", fn); |
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213 | putenv(env); |
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214 | g_free(fn); |
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215 | /* Looks like env should *not* be freed here as putenv |
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216 | doesn't make a copy. Odd. */ |
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217 | |
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218 | i = chdir(old_cwd); |
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219 | close(global.listen_socket); |
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220 | |
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221 | if (execv(argv[0], argv) == -1) { |
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222 | /* Apparently the execve() failed, so let's just |
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223 | jump back into our own/current main(). */ |
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224 | /* Need more cleanup code to make this work. */ |
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225 | return 1; /* main( argc, argv ); */ |
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226 | } |
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227 | } |
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228 | |
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229 | return(0); |
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230 | } |
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231 | |
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232 | static int crypt_main(int argc, char *argv[]) |
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233 | { |
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234 | int pass_len; |
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235 | unsigned char *pass_cr, *pass_cl; |
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236 | |
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237 | if (argc < 4 || (strcmp(argv[2], "hash") != 0 && |
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238 | strcmp(argv[2], "unhash") != 0 && argc < 5)) { |
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239 | printf("Supported:\n" |
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240 | " %s -x enc <key> <cleartext password>\n" |
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241 | " %s -x dec <key> <encrypted password>\n" |
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242 | " %s -x hash <cleartext password>\n" |
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243 | " %s -x unhash <hashed password>\n" |
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244 | " %s -x chkhash <hashed password> <cleartext password>\n", |
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245 | argv[0], argv[0], argv[0], argv[0], argv[0]); |
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246 | } else if (strcmp(argv[2], "enc") == 0) { |
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247 | char *encoded; |
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248 | |
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249 | pass_len = arc_encode(argv[4], strlen(argv[4]), &pass_cr, argv[3], 12); |
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250 | |
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251 | encoded = base64_encode(pass_cr, pass_len); |
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252 | printf("%s\n", encoded); |
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253 | g_free(encoded); |
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254 | g_free(pass_cr); |
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255 | } else if (strcmp(argv[2], "dec") == 0) { |
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256 | pass_len = base64_decode(argv[4], &pass_cr); |
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257 | arc_decode(pass_cr, pass_len, (char **) &pass_cl, argv[3]); |
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258 | printf("%s\n", pass_cl); |
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259 | |
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260 | g_free(pass_cr); |
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261 | g_free(pass_cl); |
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262 | } else if (strcmp(argv[2], "hash") == 0) { |
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263 | guint8 pass_md5[21]; |
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264 | GChecksum *md5_state; |
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265 | gsize digest_len = MD5_HASH_SIZE; |
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266 | char *encoded; |
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267 | |
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268 | random_bytes(pass_md5 + 16, 5); |
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269 | md5_state = g_checksum_new(G_CHECKSUM_MD5); |
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270 | g_checksum_update(md5_state, (guint8 *) argv[3], strlen(argv[3])); |
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271 | g_checksum_update(md5_state, pass_md5 + 16, 5); /* Add the salt. */ |
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272 | g_checksum_get_digest(md5_state, pass_md5, &digest_len); |
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273 | g_checksum_free(md5_state); |
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274 | |
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275 | encoded = base64_encode(pass_md5, 21); |
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276 | printf("%s\n", encoded); |
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277 | g_free(encoded); |
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278 | } else if (strcmp(argv[2], "unhash") == 0) { |
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279 | printf("Hash %s submitted to a massive Beowulf cluster of\n" |
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280 | "overclocked 486s. Expect your answer next year somewhere around this time. :-)\n", argv[3]); |
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281 | } else if (strcmp(argv[2], "chkhash") == 0) { |
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282 | char *hash = strncmp(argv[3], "md5:", 4) == 0 ? argv[3] + 4 : argv[3]; |
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283 | int st = md5_verify_password(argv[4], hash); |
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284 | |
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285 | printf("Hash %s given password.\n", st == 0 ? "matches" : "does not match"); |
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286 | |
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287 | return st; |
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288 | } |
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289 | |
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290 | return 0; |
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291 | } |
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292 | |
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293 | /* Set up a pipe for SIGTERM/SIGINT so the actual signal handler doesn't do anything unsafe */ |
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294 | void sighandler_shutdown_setup() |
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295 | { |
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296 | if (shutdown_pipe.fd[0] != -1) { |
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297 | /* called again from a forked process, clean up to avoid propagating the signal */ |
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298 | b_event_remove(shutdown_pipe.tag); |
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299 | close(shutdown_pipe.fd[0]); |
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300 | close(shutdown_pipe.fd[1]); |
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301 | } |
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302 | |
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303 | if (pipe(shutdown_pipe.fd) == 0) { |
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304 | shutdown_pipe.tag = b_input_add(shutdown_pipe.fd[0], B_EV_IO_READ, bitlbee_shutdown, NULL); |
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305 | } |
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306 | } |
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307 | |
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308 | /* Signal handler for SIGTERM and SIGINT */ |
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309 | static void sighandler_shutdown(int signal) |
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310 | { |
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311 | int unused G_GNUC_UNUSED; |
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312 | /* Write a single null byte to the pipe, just to send a message to the main loop. |
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313 | * This gets handled by bitlbee_shutdown (the b_input_add callback for this pipe) */ |
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314 | unused = write(shutdown_pipe.fd[1], "", 1); |
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315 | } |
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316 | |
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317 | #ifdef HAVE_BACKTRACE |
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318 | /* Writes a backtrace to (usually) /var/lib/bitlbee/crash.log |
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319 | * No malloc allowed means not a lot can be written to that file */ |
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320 | static void sighandler_crash_backtrace() |
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321 | { |
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322 | int fd, mapsfd; |
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323 | int size; |
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324 | void *trace[128]; |
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325 | const char message[] = "## " PACKAGE " crashed\n" |
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326 | "## Version: " BITLBEE_VERSION "\n" |
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327 | "## Configure args: " BITLBEE_CONFIGURE_ARGS "\n" |
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328 | "##\n" |
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329 | "## Backtrace:\n\n"; |
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330 | const char message2[] = "\n" |
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331 | "## Hint: To get details on addresses use\n" |
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332 | "## addr2line -e <binary> <address>\n" |
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333 | "## or\n" |
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334 | "## gdb <binary> -ex 'l *<address>' -ex q\n" |
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335 | "## where <binary> is a filename from above and <address> is the part between (...)\n" |
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336 | "##\n\n"; |
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337 | const char message3[] = "\n## End of memory maps. See above for the backtrace\n\n"; |
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338 | |
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339 | fd = open(CRASHFILE, O_WRONLY | O_APPEND | O_CREAT, 0600); |
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340 | |
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341 | if (fd == -1 || write(fd, message, sizeof(message) - 1) == -1) { |
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342 | return; |
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343 | } |
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344 | |
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345 | size = backtrace(trace, 128); |
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346 | backtrace_symbols_fd(trace, size, fd); |
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347 | |
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348 | (void) write(fd, message2, sizeof(message2) - 1); |
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349 | |
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350 | /* a bit too linux-specific, so fail gracefully */ |
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351 | mapsfd = open("/proc/self/maps", O_RDONLY, 0); |
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352 | |
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353 | if (mapsfd != -1) { |
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354 | char buf[4096] = {0}; |
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355 | ssize_t bytes; |
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356 | |
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357 | while ((bytes = read(mapsfd, buf, sizeof(buf))) > 0) { |
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358 | (void) write(fd, buf, bytes); |
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359 | } |
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360 | (void) close(mapsfd); |
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361 | (void) write(fd, message3, sizeof(message3) - 1); |
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362 | } |
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363 | |
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364 | (void) close(fd); |
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365 | } |
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366 | #endif |
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367 | |
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368 | /* Signal handler for SIGSEGV |
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369 | * A desperate attempt to tell the user that everything is wrong in the world. |
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370 | * Avoids using irc_abort() because it has several unsafe calls to malloc */ |
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371 | static void sighandler_crash(int signal) |
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372 | { |
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373 | GSList *l; |
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374 | const char message[] = "ERROR :BitlBee crashed! (SIGSEGV received)\r\n" |
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375 | #ifdef HAVE_BACKTRACE |
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376 | "ERROR :Writing backtrace to " CRASHFILE "\r\n" |
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377 | #endif |
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378 | "ERROR :This is a bug either in BitlBee or a plugin, ask us on IRC if unsure\r\n"; |
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379 | |
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380 | for (l = irc_connection_list; l; l = l->next) { |
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381 | irc_t *irc = l->data; |
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382 | sock_make_blocking(irc->fd); |
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383 | if (irc->sendbuffer) { |
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384 | (void) write(irc->fd, irc->sendbuffer->str, irc->sendbuffer->len); |
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385 | } |
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386 | (void) write(irc->fd, message, sizeof(message) - 1); |
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387 | } |
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388 | |
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389 | #ifdef HAVE_BACKTRACE |
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390 | sighandler_crash_backtrace(); |
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391 | #endif |
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392 | |
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393 | raise(signal); |
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394 | } |
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395 | |
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396 | double gettime() |
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397 | { |
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398 | struct timeval time[1]; |
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399 | |
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400 | gettimeofday(time, 0); |
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401 | return((double) time->tv_sec + (double) time->tv_usec / 1000000); |
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402 | } |
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