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 "config.h"
  12
  13 static char *host = DEFAULT_HOST;
  14 static char *port = DEFAULT_PORT;
  15 static char *password;
  16 static char nick[32];
  17 static char bufin[4096];
  18 static char bufout[4096];
  19 static char channel[256];
  20 static time_t trespond;
  21 static FILE *srv;
  22
  23 #include "util.c"
  24
  25 static void
  26 pout(char *channel, char *fmt, ...) {
  27         static char timestr[80];
  28         time_t t;
  29         va_list ap;
  30
  31         va_start(ap, fmt);
  32         vsnprintf(bufout, sizeof bufout, fmt, ap);
  33         va_end(ap);
  34         t = time(NULL);
  35         strftime(timestr, sizeof timestr, TIMESTAMP_FORMAT, localtime(&t));
  36         fprintf(stdout, "%-12s: %s %s\n", channel, timestr, bufout);
  37 }
  38
  39 static void
  40 sout(char *fmt, ...) {
  41         va_list ap;
  42
  43         va_start(ap, fmt);
  44         vsnprintf(bufout, sizeof bufout, fmt, ap);
  45         va_end(ap);
  46         fprintf(srv, "%s\r\n", bufout);
  47 }
  48
  49 static void
  50 privmsg(char *channel, char *msg) {
  51         if(channel[0] == '\0') {
  52                 pout("", "No channel to send to");
  53                 return;
  54         }
  55         pout(channel, "<%s> %s", nick, msg);
  56         sout("PRIVMSG %s :%s", channel, msg);
  57 }
  58
  59 static void
  60 parsein(char *s) {
  61         char c, *p;
  62
  63         if(s[0] == '\0')
  64                 return;
  65         skip(s, '\n');
  66         if(s[0] != ':') {
  67                 privmsg(channel, s);
  68                 return;
  69         }
  70         c = *++s;
  71         if(c != '\0' && isspace(s[1])) {
  72                 p = s + 2;
  73                 switch(c) {
  74                 case 'j':
  75                         sout("JOIN %s", p);
  76                         if(channel[0] == '\0')
  77                                 strlcpy(channel, p, sizeof channel);
  78                         return;
  79                 case 'l':
  80                         s = eat(p, isspace, 1);
  81                         p = eat(s, isspace, 0);
  82                         if(!*s)
  83                                 s = channel;
  84                         if(*p)
  85                                 *p++ = '\0';
  86                         if(!*p)
  87                                 p = "sic - 250 LOC are too much!";
  88                         sout("PART %s :%s", s, p);
  89                         return;
  90                 case 'm':
  91                         s = eat(p, isspace, 1);
  92                         p = eat(s, isspace, 0);
  93                         if(*p)
  94                                 *p++ = '\0';
  95                         privmsg(s, p);
  96                         return;
  97                 case 's':
  98                         strlcpy(channel, p, sizeof channel);
  99                         return;
 100                 }
 101         }
 102         sout("%s", s);
 103 }
 104
 105 static void
 106 parsesrv(char *cmd) {
 107         char *usr, *par, *txt;
 108
 109         usr = host;
 110         if(!cmd || !*cmd)
 111                 return;
 112         if(cmd[0] == ':') {
 113                 usr = cmd + 1;
 114                 cmd = skip(usr, ' ');
 115                 if(cmd[0] == '\0')
 116                         return;
 117                 skip(usr, '!');
 118         }
 119         skip(cmd, '\r');
 120         par = skip(cmd, ' ');
 121         txt = skip(par, ':');
 122         trim(par);
 123         if(!strcmp("PONG", cmd))
 124                 return;
 125         if(!strcmp("PRIVMSG", cmd))
 126                 pout(par, "<%s> %s", usr, txt);
 127         else if(!strcmp("PING", cmd))
 128                 sout("PONG %s", txt);
 129         else {
 130                 pout(usr, ">< %s (%s): %s", cmd, par, txt);
 131                 if(!strcmp("NICK", cmd) && !strcmp(usr, nick))
 132                         strlcpy(nick, txt, sizeof nick);
 133         }
 134 }
 135
 136 int
 137 main(int argc, char *argv[]) {
 138         int i, c;
 139         struct timeval tv;
 140         const char *user = getenv("USER");
 141         fd_set rd;
 142
 143         strlcpy(nick, user ? user : "unknown", sizeof nick);
 144         for(i = 1; i < argc; i++) {
 145                 c = argv[i][1];
 146                 if(argv[i][0] != '-' || argv[i][2])
 147                         c = -1;
 148                 switch(c) {
 149                 case 'h':
 150                         if(++i < argc) host = argv[i];
 151                         break;
 152                 case 'p':
 153                         if(++i < argc) port = argv[i];
 154                         break;
 155                 case 'n':
 156                         if(++i < argc) strlcpy(nick, argv[i], sizeof nick);
 157                         break;
 158                 case 'k':
 159                         if(++i < argc) password = argv[i];
 160                         break;
 161                 case 'v':
 162                         eprint("sic-"VERSION", © 2005-2012 Kris Maglione, Anselm R. Garbe, Nico Golde\n");
 163                 default:
 164                         eprint("usage: sic [-h host] [-p port] [-n nick] [-k keyword] [-v]\n");
 165                 }
 166         }
 167         /* init */
 168         i = dial(host, port);
 169         srv = fdopen(i, "r+");
 170         /* login */
 171         if(password)
 172                 sout("PASS %s", password);
 173         sout("NICK %s", nick);
 174         sout("USER %s localhost %s :%s", nick, host, nick);
 175         fflush(srv);
 176         setbuf(stdout, NULL);
 177         setbuf(srv, NULL);
 178         for(;;) { /* main loop */
 179                 FD_ZERO(&rd);
 180                 FD_SET(0, &rd);
 181                 FD_SET(fileno(srv), &rd);
 182                 tv.tv_sec = 120;
 183                 tv.tv_usec = 0;
 184                 i = select(fileno(srv) + 1, &rd, 0, 0, &tv);
 185                 if(i < 0) {
 186                         if(errno == EINTR)
 187                                 continue;
 188                         eprint("sic: error on select():");
 189                 }
 190                 else if(i == 0) {
 191                         if(time(NULL) - trespond >= 300)
 192                                 eprint("sic shutting down: parse timeout\n");
 193                         sout("PING %s", host);
 194                         continue;
 195                 }
 196                 if(FD_ISSET(fileno(srv), &rd)) {
 197                         if(fgets(bufin, sizeof bufin, srv) == NULL)
 198                                 eprint("sic: remote host closed connection\n");
 199                         parsesrv(bufin);
 200                         trespond = time(NULL);
 201                 }
 202                 if(FD_ISSET(0, &rd)) {
 203                         if(fgets(bufin, sizeof bufin, stdin) == NULL)
 204                                 eprint("sic: broken pipe\n");
 205                         parsein(bufin);
 206                 }
 207         }
 208         return 0;
 209 }