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