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	sic.c - sic - simple irc client
	git clone git://git.suckless.org/sic
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	---
	sic.c (4393B)
	---
	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] [-…
	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, Ansel…
	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…
	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 connecti…
	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 }