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 #include "arg.h"
  12 #include "config.h"
  13
  14 char *argv0;
  15 static char *host = DEFAULT_HOST;
  16 static char *port = DEFAULT_PORT;
  17 static char *password;
  18 static char nick[32];
  19 static char bufin[4096];
  20 static char bufout[4096];
  21 static char channel[256];
  22 static time_t trespond;
  23 static FILE *srv;
  24
  25 #include "util.c"
  26
  27 static void
  28 pout(char *channel, char *fmt, ...) {
  29         static char timestr[80];
  30         time_t t;
  31         va_list ap;
  32
  33         va_start(ap, fmt);
  34         vsnprintf(bufout, sizeof bufout, fmt, ap);
  35         va_end(ap);
  36         t = time(NULL);
  37         strftime(timestr, sizeof timestr, TIMESTAMP_FORMAT, localtime(&t));
  38         fprintf(stdout, "%-12s: %s %s\n", channel, timestr, bufout);
  39 }
  40
  41 static void
  42 sout(char *fmt, ...) {
  43         va_list ap;
  44
  45         va_start(ap, fmt);
  46         vsnprintf(bufout, sizeof bufout, fmt, ap);
  47         va_end(ap);
  48         fprintf(srv, "%s\r\n", bufout);
  49 }
  50
  51 static void
  52 privmsg(char *channel, char *msg) {
  53         if(channel[0] == '\0') {
  54                 pout("", "No channel to send to");
  55                 return;
  56         }
  57         pout(channel, "<%s> %s", nick, msg);
  58         sout("PRIVMSG %s :%s", channel, msg);
  59 }
  60
  61 static void
  62 parsein(char *s) {
  63         char c, *p;
  64
  65         if(s[0] == '\0')
  66                 return;
  67         skip(s, '\n');
  68         if(s[0] != COMMAND_PREFIX_CHARACTER) {
  69                 privmsg(channel, s);
  70                 return;
  71         }
  72         c = *++s;
  73         if(c != '\0' && isspace(s[1])) {
  74                 p = s + 2;
  75                 switch(c) {
  76                 case 'j':
  77                         sout("JOIN %s", p);
  78                         if(channel[0] == '\0')
  79                                 strlcpy(channel, p, sizeof channel);
  80                         return;
  81                 case 'l':
  82                         s = eat(p, isspace, 1);
  83                         p = eat(s, isspace, 0);
  84                         if(!*s)
  85                                 s = channel;
  86                         if(*p)
  87                                 *p++ = '\0';
  88                         if(!*p)
  89                                 p = DEFAULT_PARTING_MESSAGE;
  90                         sout("PART %s :%s", s, p);
  91                         return;
  92                 case 'm':
  93                         s = eat(p, isspace, 1);
  94                         p = eat(s, isspace, 0);
  95                         if(*p)
  96                                 *p++ = '\0';
  97                         privmsg(s, p);
  98                         return;
  99                 case 's':
 100                         strlcpy(channel, p, sizeof channel);
 101                         return;
 102                 }
 103         }
 104         sout("%s", s);
 105 }
 106
 107 static void
 108 parsesrv(char *cmd) {
 109         char *usr, *par, *txt;
 110
 111         usr = host;
 112         if(!cmd || !*cmd)
 113                 return;
 114         if(cmd[0] == ':') {
 115                 usr = cmd + 1;
 116                 cmd = skip(usr, ' ');
 117                 if(cmd[0] == '\0')
 118                         return;
 119                 skip(usr, '!');
 120         }
 121         skip(cmd, '\r');
 122         par = skip(cmd, ' ');
 123         txt = skip(par, ':');
 124         trim(par);
 125         if(!strcmp("PONG", cmd))
 126                 return;
 127         if(!strcmp("PRIVMSG", cmd))
 128                 pout(par, "<%s> %s", usr, txt);
 129         else if(!strcmp("PING", cmd))
 130                 sout("PONG %s", txt);
 131         else {
 132                 pout(usr, ">< %s (%s): %s", cmd, par, txt);
 133                 if(!strcmp("NICK", cmd) && !strcmp(usr, nick))
 134                         strlcpy(nick, txt, sizeof nick);
 135         }
 136 }
 137
 138
 139 static void
 140 usage(void) {
 141         eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n", argv0);
 142 }
 143
 144 int
 145 main(int argc, char *argv[]) {
 146         struct timeval tv;
 147         const char *user = getenv("USER");
 148         int n;
 149         fd_set rd;
 150
 151         strlcpy(nick, user ? user : "unknown", sizeof nick);
 152         ARGBEGIN {
 153         case 'h':
 154                 host = EARGF(usage());
 155                 break;
 156         case 'p':
 157                 port = EARGF(usage());
 158                 break;
 159         case 'n':
 160                 strlcpy(nick, EARGF(usage()), sizeof nick);
 161                 break;
 162         case 'k':
 163                 password = EARGF(usage());
 164                 break;
 165         case 'v':
 166                 eprint("sic-"VERSION", © 2005-2014 Kris Maglione, Anselm R. Garbe, Nico Golde\n");
 167                 break;
 168         default:
 169                 usage();
 170         } ARGEND;
 171
 172         /* init */
 173         srv = fdopen(dial(host, port), "r+");
 174         if (!srv)
 175                 eprint("fdopen:");
 176         /* login */
 177         if(password)
 178                 sout("PASS %s", password);
 179         sout("NICK %s", nick);
 180         sout("USER %s localhost %s :%s", nick, host, nick);
 181         fflush(srv);
 182         setbuf(stdout, NULL);
 183         setbuf(srv, NULL);
 184         setbuf(stdin, NULL);
 185         for(;;) { /* main loop */
 186                 FD_ZERO(&rd);
 187                 FD_SET(0, &rd);
 188                 FD_SET(fileno(srv), &rd);
 189                 tv.tv_sec = 120;
 190                 tv.tv_usec = 0;
 191                 n = select(fileno(srv) + 1, &rd, 0, 0, &tv);
 192                 if(n < 0) {
 193                         if(errno == EINTR)
 194                                 continue;
 195                         eprint("sic: error on select():");
 196                 }
 197                 else if(n == 0) {
 198                         if(time(NULL) - trespond >= 300)
 199                                 eprint("sic shutting down: parse timeout\n");
 200                         sout("PING %s", host);
 201                         continue;
 202                 }
 203                 if(FD_ISSET(fileno(srv), &rd)) {
 204                         if(fgets(bufin, sizeof bufin, srv) == NULL)
 205                                 eprint("sic: remote host closed connection\n");
 206                         parsesrv(bufin);
 207                         trespond = time(NULL);
 208                 }
 209                 if(FD_ISSET(0, &rd)) {
 210                         if(fgets(bufin, sizeof bufin, stdin) == NULL)
 211                                 eprint("sic: broken pipe\n");
 212                         parsein(bufin);
 213                 }
 214         }
 215         return 0;
 216 }