sic.c

   1  /* See LICENSE file for license details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <stdarg.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <time.h>
   9 #include <unistd.h>
  10
  11 static char *host = "irc.oftc.net";
  12 static char *port = "6667";
  13 static char *password;
  14 static char nick[32];
  15 static char bufin[4096];
  16 static char bufout[4096];
  17 static char channel[256];
  18 static time_t trespond;
  19 static FILE *srv;
  20
  21 #include "util.c"
  22
  23 static void
  24 pout(char *channel, char *fmt, ...) {
  25         static char timestr[18];
  26         time_t t;
  27         va_list ap;
  28
  29         va_start(ap, fmt);
  30         vsnprintf(bufout, sizeof bufout, fmt, ap);
  31         va_end(ap);
  32         t = time(NULL);
  33         strftime(timestr, sizeof timestr, "%D %R", localtime(&t));
  34         fprintf(stdout, "%-12s: %s %s\n", channel, timestr, bufout);
  35 }
  36
  37 static void
  38 sout(char *fmt, ...) {
  39         va_list ap;
  40
  41         va_start(ap, fmt);
  42         vsnprintf(bufout, sizeof bufout, fmt, ap);
  43         va_end(ap);
  44         fprintf(srv, "%s\r\n", bufout);
  45 }
  46
  47 static void
  48 privmsg(char *channel, char *msg) {
  49         if(channel[0] == '\0') {
  50                 pout("", "No channel to send to");
  51                 return;
  52         }
  53         pout(channel, "<%s> %s", nick, msg);
  54         sout("PRIVMSG %s :%s", channel, msg);
  55 }
  56
  57 static void
  58 parsein(char *s) {
  59         char c, *p;
  60
  61         if(s[0] == '\0')
  62                 return;
  63         skip(s, '\n');
  64         if(s[0] != ':') {
  65                 privmsg(channel, s);
  66                 return;
  67         }
  68         c = *++s;
  69         if(c != '\0' && isspace(s[1])) {
  70                 p = s + 2;
  71                 switch(c) {
  72                 case 'j':
  73                         sout("JOIN %s", p);
  74                         if(channel[0] == '\0')
  75                                 strlcpy(channel, p, sizeof channel);
  76                         return;
  77                 case 'l':
  78                         s = eat(p, isspace, 1);
  79                         p = eat(s, isspace, 0);
  80                         if(!*s)
  81                                 s = channel;
  82                         if(*p)
  83                                 *p++ = '\0';
  84                         if(!*p)
  85                                 p = "sic - 250 LOC are too much!";
  86                         sout("PART %s :%s", s, p);
  87                         return;
  88                 case 'm':
  89                         s = eat(p, isspace, 1);
  90                         p = eat(s, isspace, 0);
  91                         if(*p)
  92                                 *p++ = '\0';
  93                         privmsg(s, p);
  94                         return;
  95                 case 's':
  96                         strlcpy(channel, p, sizeof channel);
  97                         return;
  98                 }
  99         }
 100         sout("%s", s);
 101 }
 102
 103 static void
 104 parsesrv(char *cmd) {
 105         char *usr, *par, *txt;
 106
 107         usr = host;
 108         if(!cmd || !*cmd)
 109                 return;
 110         if(cmd[0] == ':') {
 111                 usr = cmd + 1;
 112                 cmd = skip(usr, ' ');
 113                 if(cmd[0] == '\0')
 114                         return;
 115                 skip(usr, '!');
 116         }
 117         skip(cmd, '\r');
 118         par = skip(cmd, ' ');
 119         txt = skip(par, ':');
 120         trim(par);
 121         if(!strcmp("PONG", cmd))
 122                 return;
 123         if(!strcmp("PRIVMSG", cmd))
 124                 pout(par, "<%s> %s", usr, txt);
 125         else if(!strcmp("PING", cmd))
 126                 sout("PONG %s", txt);
 127         else {
 128                 pout(usr, ">< %s (%s): %s", cmd, par, txt);
 129                 if(!strcmp("NICK", cmd) && !strcmp(usr, nick))
 130                         strlcpy(nick, txt, sizeof nick);
 131         }
 132 }
 133
 134 int
 135 main(int argc, char *argv[]) {
 136         int i, c;
 137         struct timeval tv;
 138         const char *user = getenv("USER");
 139         fd_set rd;
 140
 141         strlcpy(nick, user ? user : "unknown", sizeof nick);
 142         for(i = 1; i < argc; i++) {
 143                 c = argv[i][1];
 144                 if(argv[i][0] != '-' || argv[i][2])
 145                         c = -1;
 146                 switch(c) {
 147                 case 'h':
 148                         if(++i < argc) host = argv[i];
 149                         break;
 150                 case 'p':
 151                         if(++i < argc) port = argv[i];
 152                         break;
 153                 case 'n':
 154                         if(++i < argc) strlcpy(nick, argv[i], sizeof nick);
 155                         break;
 156                 case 'k':
 157                         if(++i < argc) password = argv[i];
 158                         break;
 159                 case 'v':
 160                         eprint("sic-"VERSION", © 2005-2009 Kris Maglione, Anselm R. Garbe, Nico Golde\n");
 161                 default:
 162                         eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n");
 163                 }
 164         }
 165         /* init */
 166         i = dial(host, port);
 167         srv = fdopen(i, "r+");
 168         /* login */
 169         if(password)
 170                 sout("PASS %s", password);
 171         sout("NICK %s", nick);
 172         sout("USER %s localhost %s :%s", nick, host, nick);
 173         fflush(srv);
 174         setbuf(stdout, NULL);
 175         setbuf(srv, NULL);
 176         for(;;) { /* main loop */
 177                 FD_ZERO(&rd);
 178                 FD_SET(0, &rd);
 179                 FD_SET(fileno(srv), &rd);
 180                 tv.tv_sec = 120;
 181                 tv.tv_usec = 0;
 182                 i = select(fileno(srv) + 1, &rd, 0, 0, &tv);
 183                 if(i < 0) {
 184                         if(errno == EINTR)
 185                                 continue;
 186                         eprint("sic: error on select():");
 187                 }
 188                 else if(i == 0) {
 189                         if(time(NULL) - trespond >= 300)
 190                                 eprint("sic shutting down: parse timeout\n");
 191                         sout("PING %s", host);
 192                         continue;
 193                 }
 194                 if(FD_ISSET(fileno(srv), &rd)) {
 195                         if(fgets(bufin, sizeof bufin, srv) == NULL)
 196                                 eprint("sic: remote host closed connection\n");
 197                         parsesrv(bufin);
 198                         trespond = time(NULL);
 199                 }
 200                 if(FD_ISSET(0, &rd)) {
 201                         if(fgets(bufin, sizeof bufin, stdin) == NULL)
 202                                 eprint("sic: broken pipe\n");
 203                         parsein(bufin);
 204                 }
 205         }
 206         return 0;
 207 }