329 lines
8.6 KiB
C
329 lines
8.6 KiB
C
/* (C)opyright MMV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
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* (C)opyright MMV-MMVI Nico Golde <nico at ngolde dot de>
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* See LICENSE file for license details.
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*/
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#include <errno.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#define PINGTIMEOUT 300
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#define MAXMSG 4096
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enum { Tnick, Tuser, Tcmd, Tchan, Targ, Ttext, Tlast };
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static char *server = "irc.oftc.net";
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static unsigned short port = 6667;
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static char *nick = NULL;
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static char *fullname = NULL;
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static char *password = NULL;
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static char bufin[MAXMSG], bufout[MAXMSG];
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static char channel[256];
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static int srv;
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static time_t trespond;
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static int
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getline(int fd, unsigned int len, char *buf) {
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unsigned int i = 0;
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char c;
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do {
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if(read(fd, &c, sizeof(char)) != sizeof(char))
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return -1;
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buf[i++] = c;
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}
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while(c != '\n' && i < len);
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buf[i - 1] = 0;
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return 0;
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}
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static void
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pout(char *channel, char *msg) {
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static char timestr[18];
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time_t t = time(0);
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strftime(timestr, sizeof timestr, "%F %R", localtime(&t));
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fprintf(stdout, "%-8.8s: %s %s\n", channel, timestr, msg);
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}
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static void
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privmsg(char *channel, char *msg) {
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snprintf(bufout, sizeof bufout, "<%s> %s", nick, msg);
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pout(channel, bufout);
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snprintf(bufout, sizeof bufout, "PRIVMSG %s :%s\r\n", channel, msg);
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write(srv, bufout, strlen(bufout));
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}
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static void
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parsein(char *msg) {
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char *p;
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if(msg[0] == 0)
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return;
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if(msg[0] != '/') {
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privmsg(channel, msg);
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return;
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}
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if(!strncmp(msg + 1, "j ", 2) && (msg[3] == '#'))
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snprintf(bufout, sizeof bufout, "JOIN %s\r\n", &msg[3]);
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else if(!strncmp(msg + 1, "l ", 2))
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snprintf(bufout, sizeof bufout, "PART %s :sic\r\n", &msg[3]);
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else if(!strncmp(msg + 1, "m ", 2)) {
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if((p = strchr(&msg[3], ' ')))
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*(p++) = 0;
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privmsg(&msg[3], p);
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return;
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}
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else if(!strncmp(msg + 1, "s ", 2)) {
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strncpy(channel, &msg[3], sizeof channel);
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return;
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}
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else if(!strncmp(msg + 1, "t ", 2)) {
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if((p = strchr(&msg[3], ' ')))
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*(p++) = 0;
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snprintf(bufout, sizeof bufout, "TOPIC %s :%s\r\n", &msg[3], p);
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}
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else
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snprintf(bufout, sizeof bufout, "%s\r\n", &msg[1]);
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write(srv, bufout, strlen(bufout));
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}
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static unsigned int
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tokenize(char **result, unsigned int reslen, char *str, char delim) {
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char *p, *n;
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unsigned int i = 0;
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if(!str)
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return 0;
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for(n = str; *n == delim; n++);
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p = n;
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for(i = 0; *n != 0;) {
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if(i == reslen)
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return i;
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if(*n == delim) {
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*n = 0;
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if(strlen(p))
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result[i++] = p;
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p = ++n;
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} else
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n++;
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}
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if((i < reslen) && (p < n) && strlen(p))
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result[i++] = p;
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return i; /* number of tokens */
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}
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static void
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parsesrv(char *msg) {
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char *argv[Tlast], *cmd, *p;
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int i;
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if(!msg || !(*msg))
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return;
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for(i = 0; i < Tlast; i++)
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argv[i] = NULL;
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/* <bufout> ::= [':' <prefix> <SPACE> ] <command> <params> <crlf>
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* <prefix> ::= <servername> | <nick> [ '!' <user> ] [ '@' <server> ]
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* <command> ::= <letter> { <letter> } | <number> <number> <number>
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* <SPACE> ::= ' ' { ' ' }
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* <params> ::= <SPACE> [ ':' <trailing> | <middle> <params> ]
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* <middle> ::= <Any *non-empty* sequence of octets not including SPACE
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* or NUL or CR or LF, the first of which may not be ':'>
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* <trailing> ::= <Any, possibly *empty*, sequence of octets not including NUL or CR or LF>
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* <crlf> ::= CR LF
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*/
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if(msg[0] == ':') { /* check prefix */
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if (!(p = strchr(msg, ' ')))
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return;
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*p = 0;
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for(++p; *p == ' '; p++);
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cmd = p;
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argv[Tnick] = &msg[1];
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if((p = strchr(msg, '!'))) {
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*p = 0;
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argv[Tuser] = ++p;
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}
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} else
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cmd = msg;
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/* remove CRLFs */
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for(p = cmd; p && *p != 0; p++)
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if(*p == '\r' || *p == '\n')
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*p = 0;
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if((p = strchr(cmd, ':'))) {
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*p = 0;
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argv[Ttext] = ++p;
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}
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tokenize(&argv[Tcmd], Tlast - Tcmd, cmd, ' ');
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if(!argv[Tcmd] || !strncmp("PONG", argv[Tcmd], 5))
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return;
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else if(!strncmp("PING", argv[Tcmd], 5)) {
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snprintf(bufout, sizeof bufout, "PONG %s\r\n", argv[Ttext]);
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write(srv, bufout, strlen(bufout));
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return;
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}
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else if(!argv[Tnick] || !argv[Tuser]) { /* server command */
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snprintf(bufout, sizeof bufout, "%s", argv[Ttext] ? argv[Ttext] : "");
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pout(server, bufout);
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return;
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}
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else if(!strncmp("ERROR", argv[Tcmd], 6))
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snprintf(bufout, sizeof bufout, "-!- error %s",
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argv[Ttext] ? argv[Ttext] : "unknown");
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else if(!strncmp("JOIN", argv[Tcmd], 5)) {
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if(argv[Ttext]!=NULL){
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p = strchr(argv[Ttext], ' ');
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if(p)
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*p = 0;
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}
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argv[Tchan] = argv[Ttext];
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snprintf(bufout, sizeof bufout, "-!- %s(%s) has joined %s",
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argv[Tnick], argv[Tuser], argv[Ttext]);
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}
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else if(!strncmp("PART", argv[Tcmd], 5)) {
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snprintf(bufout, sizeof bufout, "-!- %s(%s) has left %s",
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argv[Tnick], argv[Tuser], argv[Tchan]);
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}
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else if(!strncmp("MODE", argv[Tcmd], 5))
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snprintf(bufout, sizeof bufout, "-!- %s changed mode/%s -> %s %s",
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argv[Tnick], argv[Tcmd + 1],
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argv[Tcmd + 2], argv[Tcmd + 3]);
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else if(!strncmp("QUIT", argv[Tcmd], 5))
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snprintf(bufout, sizeof bufout, "-!- %s(%s) has quit \"%s\"",
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argv[Tnick], argv[Tuser],
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argv[Ttext] ? argv[Ttext] : "");
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else if(!strncmp("NICK", argv[Tcmd], 5))
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snprintf(bufout, sizeof bufout, "-!- %s changed nick to %s",
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argv[Tnick], argv[Ttext]);
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else if(!strncmp("TOPIC", argv[Tcmd], 6))
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snprintf(bufout, sizeof bufout, "-!- %s changed topic to \"%s\"",
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argv[Tnick], argv[Ttext] ? argv[Ttext] : "");
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else if(!strncmp("KICK", argv[Tcmd], 5))
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snprintf(bufout, sizeof bufout, "-!- %s kicked %s (\"%s\")",
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argv[Tnick], argv[Targ],
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argv[Ttext] ? argv[Ttext] : "");
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else if(!strncmp("NOTICE", argv[Tcmd], 7))
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snprintf(bufout, sizeof bufout, "-!- \"%s\")",
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argv[Ttext] ? argv[Ttext] : "");
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else if(!strncmp("PRIVMSG", argv[Tcmd], 8))
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snprintf(bufout, sizeof bufout, "<%s> %s",
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argv[Tnick], argv[Ttext] ? argv[Ttext] : "");
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if(!argv[Tchan] || !strncmp(argv[Tchan], nick, strlen(nick)))
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pout(argv[Tnick], bufout);
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else
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pout(argv[Tchan], bufout);
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}
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int
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main(int argc, char *argv[]) {
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int i;
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struct timeval tv;
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struct hostent *hp;
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static struct sockaddr_in addr; /* initially filled with 0's */
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char ping[256];
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fd_set rd;
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nick = fullname = getenv("USER");
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for(i = 1; i < argc; i++)
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if(!strncmp(argv[i], "-s", 3)) {
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if(++i < argc) server = argv[i];
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}
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else if(!strncmp(argv[i], "-p", 3)) {
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if(++i < argc) port = (unsigned short)atoi(argv[i]);
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}
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else if(!strncmp(argv[i], "-n", 3)) {
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if(++i < argc) nick = argv[i];
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}
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else if(!strncmp(argv[i], "-k", 3)) {
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if(++i < argc) password = argv[i];
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}
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else if(!strncmp(argv[i], "-f", 3)) {
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if(++i < argc) fullname = argv[i];
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}
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else if(!strncmp(argv[i], "-v", 3)) {
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fputs("sic-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
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exit(EXIT_SUCCESS);
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}
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else {
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fputs("usage: sic [-s server] [-p port] [-n nick]"
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" [-k keyword] [-f fullname] [-v]\n", stderr);
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exit(EXIT_FAILURE);
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}
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/* init */
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if((srv = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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fprintf(stderr, "sic: cannot connect server '%s'\n", server);
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exit(EXIT_FAILURE);
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}
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if (NULL == (hp = gethostbyname(server))) {
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fprintf(stderr, "sic: cannot resolve hostname '%s'\n", server);
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exit(EXIT_FAILURE);
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}
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);
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if(connect(srv, (struct sockaddr *) &addr, sizeof(struct sockaddr_in))) {
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close(srv);
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fprintf(stderr, "sic: cannot connect server '%s'\n", server);
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exit(EXIT_FAILURE);
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}
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/* login */
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if(password)
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snprintf(bufout, sizeof bufout,
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"PASS %s\r\nNICK %s\r\nUSER %s localhost %s :%s\r\n",
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password, nick, nick, server, fullname);
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else
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snprintf(bufout, sizeof bufout, "NICK %s\r\nUSER %s localhost %s :%s\r\n",
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nick, nick, server, fullname);
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write(srv, bufout, strlen(bufout));
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snprintf(ping, sizeof ping, "PING %s\r\n", server);
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channel[0] = 0;
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setbuf(stdout, NULL); /* unbuffered stdout */
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for(;;) { /* main loop */
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FD_ZERO(&rd);
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FD_SET(0, &rd);
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FD_SET(srv, &rd);
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tv.tv_sec = 120;
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tv.tv_usec = 0;
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i = select(srv + 1, &rd, 0, 0, &tv);
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if(i < 0) {
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if(errno == EINTR)
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continue;
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perror("sic: error on select()");
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exit(EXIT_FAILURE);
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} else if(i == 0) {
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if(time(NULL) - trespond >= PINGTIMEOUT) {
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pout(server, "-!- sic shutting down: parse timeout");
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exit(EXIT_FAILURE);
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}
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write(srv, ping, strlen(ping));
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continue;
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}
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if(FD_ISSET(srv, &rd)) {
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if(getline(srv, sizeof bufin, bufin) == -1) {
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perror("sic: remote server closed connection");
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exit(EXIT_FAILURE);
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}
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parsesrv(bufin);
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trespond = time(NULL);
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}
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if(FD_ISSET(0, &rd)) {
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if(getline(0, sizeof bufin, bufin) == -1) {
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perror("sic: broken pipe");
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exit(EXIT_FAILURE);
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}
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parsein(bufin);
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}
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}
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return 0;
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}
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