sic.c

   1 /*
   2  * (C)opyright MMV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * (C)opyright MMV-MMVI Nico Golde <nico at ngolde dot de>
   4  * See LICENSE file for license details.
   5  */
   6
   7 #include <errno.h>
   8 #include <netdb.h>
   9 #include <netinet/in.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <time.h>
  14 #include <sys/socket.h>
  15 #include <sys/time.h>
  16
  17 #define PINGTIMEOUT 300
  18 #define MAXMSG 4096
  19
  20 enum { Tnick, Tuser, Tcmd, Tchan, Targ, Ttext, Tlast };
  21
  22 static char *server = "irc.oftc.net";
  23 static int port = 6667;
  24 static char *nick = NULL;
  25 static char *fullname = NULL;
  26 static char *password = NULL;
  27
  28 static char bufin[MAXMSG], bufout[MAXMSG];
  29 static char channel[256];
  30 static int srv;
  31 static time_t trespond;
  32
  33 static int
  34 getline(int fd, unsigned int len, char *buf)
  35 {
  36         unsigned int i = 0;
  37         char c;
  38         do {
  39                 if(read(fd, &c, sizeof(char)) != sizeof(char))
  40                         return -1;
  41                 buf[i++] = c;
  42         }
  43         while(c != '\n' && i < len);
  44         buf[i - 1] = 0;
  45         return 0;
  46 }
  47
  48 static void
  49 pout(char *channel, char *msg)
  50 {
  51         static char timestr[18];
  52         time_t t = time(0);
  53
  54         strftime(timestr, sizeof(timestr), "%a %R", localtime(&t));
  55         fprintf(stdout, "%-8.8s: %s %s\n", channel, timestr, msg);
  56 }
  57
  58 static void
  59 privmsg(char *channel, char *msg)
  60 {
  61         snprintf(bufout, sizeof(bufout), "<%s> %s", nick, msg);
  62         pout(channel, bufout);
  63         snprintf(bufout, sizeof(bufout), "PRIVMSG %s :%s\r\n", channel, msg);
  64         write(srv, bufout, strlen(bufout));
  65 }
  66
  67 static void
  68 parsein(char *msg)
  69 {
  70         char *p;
  71
  72         if(msg[0] == 0)
  73                 return;
  74         if(msg[0] != '/') {
  75                 privmsg(channel, msg);
  76                 return;
  77         }
  78         if((p = strchr(&msg[3], ' ')))
  79                 *(p++) = 0;
  80         switch (msg[1]) {
  81         default:
  82                 snprintf(bufout, sizeof(bufout), "%s\r\n", &msg[1]);
  83                 break;
  84         case 'j':
  85                 if(msg[3] == '#')
  86                         snprintf(bufout, sizeof(bufout), "JOIN %s\r\n", &msg[3]);
  87                 else if(p) {
  88                         privmsg(&msg[3], p + 1);
  89                         return;
  90                 }
  91                 break;
  92         case 'l':
  93                 if(p)
  94                         snprintf(bufout, sizeof(bufout), "PART %s :%s\r\n", &msg[3], p);
  95                 else
  96                         snprintf(bufout, sizeof(bufout), "PART %s :sic\r\n", &msg[3]);
  97                 break;
  98         case 'm':
  99                 privmsg(&msg[3], p);
 100                 return;
 101         case 's':
 102                 strncpy(channel, &msg[3], sizeof(channel));
 103                 return;
 104         case 't':
 105                 snprintf(bufout, sizeof(bufout), "TOPIC %s :%s\r\n", &msg[3], p);
 106                 break;
 107         }
 108         write(srv, bufout, strlen(bufout));
 109 }
 110
 111 static unsigned int
 112 tokenize(char **result, unsigned int reslen, char *str, char delim)
 113 {
 114         char *p, *n;
 115         unsigned int i = 0;
 116
 117         if(!str)
 118                 return 0;
 119         for(n = str; *n == delim; n++);
 120         p = n;
 121         for(i = 0; *n != 0;) {
 122                 if(i == reslen)
 123                         return i;
 124                 if(*n == delim) {
 125                         *n = 0;
 126                         if(strlen(p))
 127                                 result[i++] = p;
 128                         p = ++n;
 129                 } else
 130                         n++;
 131         }
 132         if((i < reslen) && (p < n) && strlen(p))
 133                 result[i++] = p;
 134         return i;       /* number of tokens */
 135 }
 136
 137 static void
 138 parsesrv(char *msg)
 139 {
 140         char *argv[Tlast], *cmd, *p;
 141         int i;
 142         if(!msg || !(*msg))
 143                 return;
 144
 145         for(i = 0; i < Tlast; i++)
 146                 argv[i] = NULL;
 147
 148         /*
 149            <bufout>  ::= [':' <prefix> <SPACE> ] <command> <params> <crlf>
 150            <prefix>   ::= <servername> | <nick> [ '!' <user> ] [ '@' <server> ]
 151            <command>  ::= <letter> { <letter> } | <number> <number> <number>
 152            <SPACE>    ::= ' ' { ' ' }
 153            <params>   ::= <SPACE> [ ':' <trailing> | <middle> <params> ]
 154            <middle>   ::= <Any *non-empty* sequence of octets not including SPACE
 155            or NUL or CR or LF, the first of which may not be ':'>
 156            <trailing> ::= <Any, possibly *empty*, sequence of octets not including NUL or CR or LF>
 157            <crlf>     ::= CR LF
 158          */
 159         if(msg[0] == ':') { /* check prefix */
 160                 p = strchr(msg, ' ');
 161                 *p = 0;
 162                 for(++p; *p == ' '; p++);
 163                 cmd = p;
 164                 argv[Tnick] = &msg[1];
 165                 if((p = strchr(msg, '!'))) {
 166                         *p = 0;
 167                         argv[Tuser] = ++p;
 168                 }
 169         } else
 170                 cmd = msg;
 171
 172         /* remove CRLFs */
 173         for(p = cmd; p && *p != 0; p++)
 174                 if(*p == '\r' || *p == '\n')
 175                         *p = 0;
 176
 177         if((p = strchr(cmd, ':'))) {
 178                 *p = 0;
 179                 argv[Ttext] = ++p;
 180         }
 181         tokenize(&argv[Tcmd], Tlast - Tcmd, cmd, ' ');
 182
 183         if(!strncmp("PONG", argv[Tcmd], 5)) {
 184                 return;
 185         } else if(!strncmp("PING", argv[Tcmd], 5)) {
 186                 snprintf(bufout, sizeof(bufout), "PONG %s\r\n", argv[Ttext]);
 187                 write(srv, bufout, strlen(bufout));
 188                 return;
 189         } else if(!argv[Tnick] || !argv[Tuser]) {       /* server command */
 190                 snprintf(bufout, sizeof(bufout), "%s", argv[Ttext] ? argv[Ttext] : "");
 191                 pout(server, bufout);
 192                 return;
 193         } else if(!strncmp("ERROR", argv[Tcmd], 6))
 194                 snprintf(bufout, sizeof(bufout), "-!- error %s",
 195                                 argv[Ttext] ? argv[Ttext] : "unknown");
 196         else if(!strncmp("JOIN", argv[Tcmd], 5)) {
 197                 if(argv[Ttext]!=NULL){
 198                         p = strchr(argv[Ttext], ' ');
 199                 if(p)
 200                         *p = 0;
 201                 }
 202                 argv[Tchan] = argv[Ttext];
 203                 snprintf(bufout, sizeof(bufout), "-!- %s(%s) has joined %s",
 204                                 argv[Tnick], argv[Tuser], argv[Ttext]);
 205         } else if(!strncmp("PART", argv[Tcmd], 5)) {
 206                 snprintf(bufout, sizeof(bufout), "-!- %s(%s) has left %s",
 207                                 argv[Tnick], argv[Tuser], argv[Tchan]);
 208         } else if(!strncmp("MODE", argv[Tcmd], 5))
 209                 snprintf(bufout, sizeof(bufout), "-!- %s changed mode/%s -> %s %s",
 210                                 argv[Tnick], argv[Tcmd + 1],
 211                                 argv[Tcmd + 2], argv[Tcmd + 3]);
 212         else if(!strncmp("QUIT", argv[Tcmd], 5))
 213                 snprintf(bufout, sizeof(bufout), "-!- %s(%s) has quit \"%s\"",
 214                                 argv[Tnick], argv[Tuser],
 215                                 argv[Ttext] ? argv[Ttext] : "");
 216         else if(!strncmp("NICK", argv[Tcmd], 5))
 217                 snprintf(bufout, sizeof(bufout), "-!- %s changed nick to %s",
 218                                 argv[Tnick], argv[Ttext]);
 219         else if(!strncmp("TOPIC", argv[Tcmd], 6))
 220                 snprintf(bufout, sizeof(bufout), "-!- %s changed topic to \"%s\"",
 221                                 argv[Tnick], argv[Ttext] ? argv[Ttext] : "");
 222         else if(!strncmp("KICK", argv[Tcmd], 5))
 223                 snprintf(bufout, sizeof(bufout), "-!- %s kicked %s (\"%s\")",
 224                                 argv[Tnick], argv[Targ],
 225                                 argv[Ttext] ? argv[Ttext] : "");
 226         else if(!strncmp("NOTICE", argv[Tcmd], 7))
 227                 snprintf(bufout, sizeof(bufout), "-!- \"%s\")",
 228                                 argv[Ttext] ? argv[Ttext] : "");
 229         else if(!strncmp("PRIVMSG", argv[Tcmd], 8))
 230                 snprintf(bufout, sizeof(bufout), "<%s> %s",
 231                                 argv[Tnick], argv[Ttext] ? argv[Ttext] : "");
 232         if(!argv[Tchan] || !strncmp(argv[Tchan], nick, strlen(nick)))
 233                 pout(argv[Tnick], bufout);
 234         else
 235                 pout(argv[Tchan], bufout);
 236 }
 237
 238 int
 239 main(int argc, char *argv[])
 240 {
 241         int i;
 242         struct timeval tv;
 243         struct hostent *hp;
 244         struct sockaddr_in addr = { 0 };
 245         char ping[256];
 246         fd_set rd;
 247
 248         nick = fullname = getenv("USER");
 249         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 250                 switch (argv[i][1]) {
 251                 default:
 252                         fputs("usage: sic [-s server] [-p port] [-n nick]"
 253                                         " [-k keyword] [-f fullname] [-v]\n", stderr);
 254                         exit(EXIT_FAILURE);
 255                         break;
 256                 case 's':
 257                         server = argv[++i];
 258                         break;
 259                 case 'p':
 260                         port = atoi(argv[++i]);
 261                         break;
 262                 case 'n':
 263                         nick = argv[++i];
 264                         break;
 265                 case 'k':
 266                         password = argv[++i];
 267                         break;
 268                 case 'f':
 269                         fullname = argv[++i];
 270                         break;
 271                 case 'v':
 272                         fputs("sic-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
 273                         exit(EXIT_SUCCESS);
 274                         break;
 275                 }
 276         }
 277
 278         /* init */
 279         if((srv = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 280                 fprintf(stderr, "sic: cannot connect server '%s'\n", server);
 281                 exit(EXIT_FAILURE);
 282         }
 283         hp = gethostbyname(server);
 284         addr.sin_family = AF_INET;
 285         addr.sin_port = htons(port);
 286         bcopy(hp->h_addr, &addr.sin_addr, hp->h_length);
 287         if(connect(srv, (struct sockaddr *) &addr, sizeof(struct sockaddr_in))) {
 288                 close(srv);
 289                 fprintf(stderr, "sic: cannot connect server '%s'\n", server);
 290                 exit(EXIT_FAILURE);
 291         }
 292
 293         /* login */
 294         if(password)
 295                 snprintf(bufout, sizeof(bufout),
 296                                 "PASS %s\r\nNICK %s\r\nUSER %s localhost %s :%s\r\n",
 297                                 password, nick, nick, server, fullname);
 298         else
 299                 snprintf(bufout, sizeof(bufout), "NICK %s\r\nUSER %s localhost %s :%s\r\n",
 300                                  nick, nick, server, fullname);
 301         write(srv, bufout, strlen(bufout));
 302
 303         snprintf(ping, sizeof(ping), "PING %s\r\n", server);
 304         channel[0] = 0;
 305         setbuf(stdout, NULL); /* unbuffered stdout */
 306         for(;;) {
 307                 FD_ZERO(&rd);
 308                 FD_SET(0, &rd);
 309                 FD_SET(srv, &rd);
 310                 tv.tv_sec = 120;
 311                 tv.tv_usec = 0;
 312                 i = select(srv + 1, &rd, 0, 0, &tv);
 313                 if(i < 0) {
 314                         if(errno == EINTR)
 315                                 continue;
 316                         perror("sic: error on select()");
 317                         exit(EXIT_FAILURE);
 318                 } else if(i == 0) {
 319                         if(time(NULL) - trespond >= PINGTIMEOUT) {
 320                                 pout(server, "-!- sic shutting down: parseing timeout");
 321                                 exit(EXIT_FAILURE);
 322                         }
 323                         write(srv, ping, strlen(ping));
 324                         continue;
 325                 }
 326                 if(FD_ISSET(srv, &rd)) {
 327                         if(getline(srv, sizeof(bufin), bufin) == -1) {
 328                                 perror("sic: remote server closed connection");
 329                                 exit(EXIT_FAILURE);
 330                         }
 331                         parsesrv(bufin);
 332                         trespond = time(NULL);
 333                 }
 334                 if(FD_ISSET(0, &rd)) {
 335                         if(getline(0, sizeof(bufin), bufin) == -1) {
 336                                 perror("sic: broken pipe");
 337                                 exit(EXIT_FAILURE);
 338                         }
 339                         parsein(bufin);
 340                 }
 341         }
 342
 343         return 0;
 344 }