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 #undef strlcpy
  26 #include "strlcpy.c"
  27 #include "util.c"
  28
  29 static void
  30 pout(char *channel, char *fmt, ...) {
  31         static char timestr[80];
  32         time_t t;
  33         va_list ap;
  34
  35         va_start(ap, fmt);
  36         vsnprintf(bufout, sizeof bufout, fmt, ap);
  37         va_end(ap);
  38         t = time(NULL);
  39         strftime(timestr, sizeof timestr, TIMESTAMP_FORMAT, localtime(&t));
  40         fprintf(stdout, "%-12s: %s %s\n", channel, timestr, bufout);
  41 }
  42
  43 static void
  44 sout(char *fmt, ...) {
  45         va_list ap;
  46
  47         va_start(ap, fmt);
  48         vsnprintf(bufout, sizeof bufout, fmt, ap);
  49         va_end(ap);
  50         fprintf(srv, "%s\r\n", bufout);
  51 }
  52
  53 static void
  54 privmsg(char *channel, char *msg) {
  55         if(channel[0] == '\0') {
  56                 pout("", "No channel to send to");
  57                 return;
  58         }
  59         pout(channel, "<%s> %s", nick, msg);
  60         sout("PRIVMSG %s :%s", channel, msg);
  61 }
  62
  63 static void
  64 parsein(char *s) {
  65         char c, *p;
  66
  67         if(s[0] == '\0')
  68                 return;
  69         skip(s, '\n');
  70         if(s[0] != COMMAND_PREFIX_CHARACTER) {
  71                 privmsg(channel, s);
  72                 return;
  73         }
  74         c = *++s;
  75         if(c != '\0' && isspace(s[1])) {
  76                 p = s + 2;
  77                 switch(c) {
  78                 case 'j':
  79                         sout("JOIN %s", p);
  80                         if(channel[0] == '\0')
  81                                 strlcpy(channel, p, sizeof channel);
  82                         return;
  83                 case 'l':
  84                         s = eat(p, isspace, 1);
  85                         p = eat(s, isspace, 0);
  86                         if(!*s)
  87                                 s = channel;
  88                         if(*p)
  89                                 *p++ = '\0';
  90                         if(!*p)
  91                                 p = DEFAULT_PARTING_MESSAGE;
  92                         sout("PART %s :%s", s, p);
  93                         return;
  94                 case 'm':
  95                         s = eat(p, isspace, 1);
  96                         p = eat(s, isspace, 0);
  97                         if(*p)
  98                                 *p++ = '\0';
  99                         privmsg(s, p);
 100                         return;
 101                 case 's':
 102                         strlcpy(channel, p, sizeof channel);
 103                         return;
 104                 }
 105         }
 106         sout("%s", s);
 107 }
 108
 109 static void
 110 parsesrv(char *cmd) {
 111         char *usr, *par, *txt;
 112
 113         usr = host;
 114         if(!cmd || !*cmd)
 115                 return;
 116         if(cmd[0] == ':') {
 117                 usr = cmd + 1;
 118                 cmd = skip(usr, ' ');
 119                 if(cmd[0] == '\0')
 120                         return;
 121                 skip(usr, '!');
 122         }
 123         skip(cmd, '\r');
 124         par = skip(cmd, ' ');
 125         txt = skip(par, ':');
 126         trim(par);
 127         if(!strcmp("PONG", cmd))
 128                 return;
 129         if(!strcmp("PRIVMSG", cmd))
 130                 pout(par, "<%s> %s", usr, txt);
 131         else if(!strcmp("PING", cmd))
 132                 sout("PONG %s", txt);
 133         else {
 134                 pout(usr, ">< %s (%s): %s", cmd, par, txt);
 135                 if(!strcmp("NICK", cmd) && !strcmp(usr, nick))
 136                         strlcpy(nick, txt, sizeof nick);
 137         }
 138 }
 139
 140
 141 static void
 142 usage(void) {
 143         eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n", argv0);
 144 }
 145
 146 int
 147 main(int argc, char *argv[]) {
 148         struct timeval tv;
 149         const char *user = getenv("USER");
 150         int n;
 151         fd_set rd;
 152
 153         strlcpy(nick, user ? user : "unknown", sizeof nick);
 154         ARGBEGIN {
 155         case 'h':
 156                 host = EARGF(usage());
 157                 break;
 158         case 'p':
 159                 port = EARGF(usage());
 160                 break;
 161         case 'n':
 162                 strlcpy(nick, EARGF(usage()), sizeof nick);
 163                 break;
 164         case 'k':
 165                 password = EARGF(usage());
 166                 break;
 167         case 'v':
 168                 eprint("sic-"VERSION", © 2005-2014 Kris Maglione, Anselm R. Garbe, Nico Golde\n");
 169                 break;
 170         default:
 171                 usage();
 172         } ARGEND;
 173
 174         /* init */
 175         srv = fdopen(dial(host, port), "r+");
 176         if (!srv)
 177                 eprint("fdopen:");
 178         /* login */
 179         if(password)
 180                 sout("PASS %s", password);
 181         sout("NICK %s", nick);
 182         sout("USER %s localhost %s :%s", nick, host, nick);
 183         fflush(srv);
 184         setbuf(stdout, NULL);
 185         setbuf(srv, NULL);
 186         setbuf(stdin, NULL);
 187 #ifdef __OpenBSD__
 188         if (pledge("stdio", NULL) == -1)
 189                 eprint("error: pledge:");
 190 #endif
 191         for(;;) { /* main loop */
 192                 FD_ZERO(&rd);
 193                 FD_SET(0, &rd);
 194                 FD_SET(fileno(srv), &rd);
 195                 tv.tv_sec = 120;
 196                 tv.tv_usec = 0;
 197                 n = select(fileno(srv) + 1, &rd, 0, 0, &tv);
 198                 if(n < 0) {
 199                         if(errno == EINTR)
 200                                 continue;
 201                         eprint("sic: error on select():");
 202                 }
 203                 else if(n == 0) {
 204                         if(time(NULL) - trespond >= 300)
 205                                 eprint("sic shutting down: parse timeout\n");
 206                         sout("PING %s", host);
 207                         continue;
 208                 }
 209                 if(FD_ISSET(fileno(srv), &rd)) {
 210                         if(fgets(bufin, sizeof bufin, srv) == NULL)
 211                                 eprint("sic: remote host closed connection\n");
 212                         parsesrv(bufin);
 213                         trespond = time(NULL);
 214                 }
 215                 if(FD_ISSET(0, &rd)) {
 216                         if(fgets(bufin, sizeof bufin, stdin) == NULL)
 217                                 eprint("sic: broken pipe\n");
 218                         parsein(bufin);
 219                 }
 220         }
 221         return 0;
 222 }