sic.c

   1  /* See LICENSE file for license details. */
   2 #include <sys/select.h>
   3
   4 #include <ctype.h>
   5 #include <errno.h>
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <time.h>
  11 #include <unistd.h>
  12
  13 #include "arg.h"
  14 #include "config.h"
  15
  16 char *argv0;
  17 static char *host = DEFAULT_HOST;
  18 static char *port = DEFAULT_PORT;
  19 static char *password;
  20 static char nick[32];
  21 static char bufin[4096];
  22 static char bufout[4096];
  23 static char channel[256];
  24 static time_t trespond;
  25 static FILE *srv;
  26
  27 #undef strlcpy
  28 #include "strlcpy.c"
  29 #include "util.c"
  30
  31 static void
  32 pout(char *channel, char *fmt, ...) {
  33         static char timestr[80];
  34         time_t t;
  35         va_list ap;
  36
  37         va_start(ap, fmt);
  38         vsnprintf(bufout, sizeof bufout, fmt, ap);
  39         va_end(ap);
  40         t = time(NULL);
  41         strftime(timestr, sizeof timestr, TIMESTAMP_FORMAT, localtime(&t));
  42         fprintf(stdout, "%-12s: %s %s\n", channel, timestr, bufout);
  43 }
  44
  45 static void
  46 sout(char *fmt, ...) {
  47         va_list ap;
  48
  49         va_start(ap, fmt);
  50         vsnprintf(bufout, sizeof bufout, fmt, ap);
  51         va_end(ap);
  52         fprintf(srv, "%s\r\n", bufout);
  53 }
  54
  55 static void
  56 privmsg(char *channel, char *msg) {
  57         if(channel[0] == '\0') {
  58                 pout("", "No channel to send to");
  59                 return;
  60         }
  61         pout(channel, "<%s> %s", nick, msg);
  62         sout("PRIVMSG %s :%s", channel, msg);
  63 }
  64
  65 static void
  66 parsein(char *s) {
  67         char c, *p;
  68
  69         if(s[0] == '\0')
  70                 return;
  71         skip(s, '\n');
  72         if(s[0] != COMMAND_PREFIX_CHARACTER) {
  73                 privmsg(channel, s);
  74                 return;
  75         }
  76         c = *++s;
  77         if(c != '\0' && isspace((unsigned char)s[1])) {
  78                 p = s + 2;
  79                 switch(c) {
  80                 case 'j':
  81                         sout("JOIN %s", p);
  82                         if(channel[0] == '\0')
  83                                 strlcpy(channel, p, sizeof channel);
  84                         return;
  85                 case 'l':
  86                         s = eat(p, isspace, 1);
  87                         p = eat(s, isspace, 0);
  88                         if(!*s)
  89                                 s = channel;
  90                         if(*p)
  91                                 *p++ = '\0';
  92                         if(!*p)
  93                                 p = DEFAULT_PARTING_MESSAGE;
  94                         sout("PART %s :%s", s, p);
  95                         return;
  96                 case 'm':
  97                         s = eat(p, isspace, 1);
  98                         p = eat(s, isspace, 0);
  99                         if(*p)
 100                                 *p++ = '\0';
 101                         privmsg(s, p);
 102                         return;
 103                 case 's':
 104                         strlcpy(channel, p, sizeof channel);
 105                         return;
 106                 }
 107         }
 108         sout("%s", s);
 109 }
 110
 111 static void
 112 parsesrv(char *cmd) {
 113         char *usr, *par, *txt;
 114
 115         usr = host;
 116         if(!cmd || !*cmd)
 117                 return;
 118         if(cmd[0] == ':') {
 119                 usr = cmd + 1;
 120                 cmd = skip(usr, ' ');
 121                 if(cmd[0] == '\0')
 122                         return;
 123                 skip(usr, '!');
 124         }
 125         skip(cmd, '\r');
 126         par = skip(cmd, ' ');
 127         txt = skip(par, ':');
 128         trim(par);
 129         if(!strcmp("PONG", cmd))
 130                 return;
 131         if(!strcmp("PRIVMSG", cmd))
 132                 pout(par, "<%s> %s", usr, txt);
 133         else if(!strcmp("PING", cmd))
 134                 sout("PONG %s", txt);
 135         else {
 136                 pout(usr, ">< %s (%s): %s", cmd, par, txt);
 137                 if(!strcmp("NICK", cmd) && !strcmp(usr, nick))
 138                         strlcpy(nick, txt, sizeof nick);
 139         }
 140 }
 141
 142
 143 static void
 144 usage(void) {
 145         eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n", argv0);
 146 }
 147
 148 int
 149 main(int argc, char *argv[]) {
 150         struct timeval tv;
 151         const char *user = getenv("USER");
 152         int n;
 153         fd_set rd;
 154
 155         strlcpy(nick, user ? user : "unknown", sizeof nick);
 156         ARGBEGIN {
 157         case 'h':
 158                 host = EARGF(usage());
 159                 break;
 160         case 'p':
 161                 port = EARGF(usage());
 162                 break;
 163         case 'n':
 164                 strlcpy(nick, EARGF(usage()), sizeof nick);
 165                 break;
 166         case 'k':
 167                 password = EARGF(usage());
 168                 break;
 169         case 'v':
 170                 eprint("sic-"VERSION", © 2005-2014 Kris Maglione, Anselm R. Garbe, Nico Golde\n");
 171                 break;
 172         default:
 173                 usage();
 174         } ARGEND;
 175
 176         /* init */
 177         srv = fdopen(dial(host, port), "r+");
 178         if (!srv)
 179                 eprint("fdopen:");
 180         /* login */
 181         if(password)
 182                 sout("PASS %s", password);
 183         sout("NICK %s", nick);
 184         sout("USER %s localhost %s :%s", nick, host, nick);
 185         fflush(srv);
 186         setbuf(stdout, NULL);
 187         setbuf(srv, NULL);
 188         setbuf(stdin, NULL);
 189 #ifdef __OpenBSD__
 190         if (pledge("stdio", NULL) == -1)
 191                 eprint("error: pledge:");
 192 #endif
 193         for(;;) { /* main loop */
 194                 FD_ZERO(&rd);
 195                 FD_SET(0, &rd);
 196                 FD_SET(fileno(srv), &rd);
 197                 tv.tv_sec = 120;
 198                 tv.tv_usec = 0;
 199                 n = select(fileno(srv) + 1, &rd, 0, 0, &tv);
 200                 if(n < 0) {
 201                         if(errno == EINTR)
 202                                 continue;
 203                         eprint("sic: error on select():");
 204                 }
 205                 else if(n == 0) {
 206                         if(time(NULL) - trespond >= 300)
 207                                 eprint("sic shutting down: parse timeout\n");
 208                         sout("PING %s", host);
 209                         continue;
 210                 }
 211                 if(FD_ISSET(fileno(srv), &rd)) {
 212                         if(fgets(bufin, sizeof bufin, srv) == NULL)
 213                                 eprint("sic: remote host closed connection\n");
 214                         parsesrv(bufin);
 215                         trespond = time(NULL);
 216                 }
 217                 if(FD_ISSET(0, &rd)) {
 218                         if(fgets(bufin, sizeof bufin, stdin) == NULL)
 219                                 eprint("sic: broken pipe\n");
 220                         parsein(bufin);
 221                 }
 222         }
 223         return 0;
 224 }