--- /dev/null
+/*
+ * (C)opyright MMV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
+ * (C)opyright MMV-MMVI Nico Golde <nico at ngolde dot de>
+ * See LICENSE file for license details.
+ */
+
+#include <errno.h>
+#include <netdb.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <string.h>
+#include <pwd.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <ctype.h>
+#include <time.h>
+#include <unistd.h>
+
+#define PING_TIMEOUT 300
+#define MAXMSG 4096
+
+enum { TOK_NICKSRV = 0, TOK_USER, TOK_CMD, TOK_CHAN, TOK_ARG, TOK_TEXT, TOK_LAST };
+
+static int irc;
+static time_t last_response;
+static char nick[32]; /* might change while running */
+static char message[MAXMSG]; /* message buf used for communication */
+static char *host = NULL;
+
+static int
+tcpopen(char *address)
+{
+ int fd = 0;
+ char *port;
+ struct sockaddr_in addr = { 0 };
+ struct hostent *hp;
+ unsigned int prt;
+
+ if((host = strchr(address, '!')))
+ *(host++) = 0;
+
+ if(!(port = strrchr(host, '!')))
+ return -1;
+ *port = 0;
+ port++;
+ if(sscanf(port, "%d", &prt) != 1)
+ return -1;
+
+ /* init */
+ if((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+ return -1;
+ hp = gethostbyname(host);
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(prt);
+ bcopy(hp->h_addr, &addr.sin_addr, hp->h_length);
+
+ if(connect(fd, (struct sockaddr *) &addr,
+ sizeof(struct sockaddr_in))) {
+ close(fd);
+ return -1;
+ }
+ return fd;
+}
+
+unsigned int
+tokenize(char **result, unsigned int reslen, char *str, char delim)
+{
+ char *p, *n;
+ unsigned int i = 0;
+
+ if(!str)
+ return 0;
+ for(n = str; *n == delim; n++);
+ p = n;
+ for(i = 0; *n != 0;) {
+ if(i == reslen)
+ return i;
+ if(*n == delim) {
+ *n = 0;
+ if(strlen(p))
+ result[i++] = p;
+ p = ++n;
+ } else
+ n++;
+ }
+ if((i < reslen) && (p < n) && strlen(p))
+ result[i++] = p;
+ return i; /* number of tokens */
+}
+
+static void
+print_out(char *channel, char *buf)
+{
+ static char buft[18];
+ time_t t = time(0);
+
+ strftime(buft, sizeof(buft), "%F %R", localtime(&t));
+ fprintf(stdout, "%s: %s %s\n", channel, buft, buf);
+}
+
+static void
+proc_channels_privmsg(char *channel, char *buf)
+{
+ snprintf(message, MAXMSG, "<%s> %s", nick, buf);
+ print_out(channel, message);
+ snprintf(message, MAXMSG, "PRIVMSG %s :%s\r\n", channel, buf);
+ write(irc, message, strlen(message));
+}
+
+static void
+proc_channels_input(char *buf)
+{
+ char *p;
+
+ if((p = strchr(buf, ' ')))
+ *(p++) = 0;
+ if(buf[0] != '/' && buf[0] != 0) {
+ proc_channels_privmsg(buf, p);
+ return;
+ }
+ if((p = strchr(&buf[3], ' ')))
+ *(p++) = 0;
+ switch (buf[1]) {
+ case 'j':
+ if(buf[3] == '#')
+ snprintf(message, MAXMSG, "JOIN %s\r\n", &buf[3]);
+ else if(p) {
+ proc_channels_privmsg(&buf[3], p + 1);
+ return;
+ }
+ break;
+ case 't':
+ snprintf(message, MAXMSG, "TOPIC %s :%s\r\n", &buf[3], p);
+ break;
+ case 'l':
+ if(p)
+ snprintf(message, MAXMSG, "PART %s :%s\r\n", &buf[3], p);
+ else
+ snprintf(message, MAXMSG, "PART %s :sic - 300 SLOC are too much\r\n", &buf[3]);
+ write(irc, message, strlen(message));
+ return;
+ break;
+ default:
+ snprintf(message, MAXMSG, "%s\r\n", &buf[1]);
+ break;
+ }
+ write(irc, message, strlen(message));
+}
+
+static void
+proc_server_cmd(char *buf)
+{
+ char *argv[TOK_LAST], *cmd, *p;
+ int i;
+ if(!buf || *buf=='\0')
+ return;
+
+ for(i = 0; i < TOK_LAST; i++)
+ argv[i] = NULL;
+
+ /*
+ <message> ::= [':' <prefix> <SPACE> ] <command> <params> <crlf>
+ <prefix> ::= <servername> | <nick> [ '!' <user> ] [ '@' <host> ]
+ <command> ::= <letter> { <letter> } | <number> <number> <number>
+ <SPACE> ::= ' ' { ' ' }
+ <params> ::= <SPACE> [ ':' <trailing> | <middle> <params> ]
+ <middle> ::= <Any *non-empty* sequence of octets not including SPACE
+ or NUL or CR or LF, the first of which may not be ':'>
+ <trailing> ::= <Any, possibly *empty*, sequence of octets not including NUL or CR or LF>
+ <crlf> ::= CR LF
+ */
+ if(buf[0] == ':') { /* check prefix */
+ p = strchr(buf, ' ');
+ *p = 0;
+ for(++p; *p == ' '; p++);
+ cmd = p;
+ argv[TOK_NICKSRV] = &buf[1];
+ if((p = strchr(buf, '!'))) {
+ *p = 0;
+ argv[TOK_USER] = ++p;
+ }
+ } else
+ cmd = buf;
+
+ /* remove CRLFs */
+ for(p = cmd; p && *p != 0; p++)
+ if(*p == '\r' || *p == '\n')
+ *p = 0;
+
+ if((p = strchr(cmd, ':'))) {
+ *p = 0;
+ argv[TOK_TEXT] = ++p;
+ }
+ tokenize(&argv[TOK_CMD], TOK_LAST - TOK_CMD, cmd, ' ');
+
+ if(!strncmp("PONG", argv[TOK_CMD], 5)) {
+ return;
+ } else if(!strncmp("PING", argv[TOK_CMD], 5)) {
+ snprintf(message, MAXMSG, "PONG %s\r\n", argv[TOK_TEXT]);
+ write(irc, message, strlen(message));
+ return;
+ } else if(!argv[TOK_NICKSRV] || !argv[TOK_USER]) { /* server command */
+ snprintf(message, MAXMSG, "%s", argv[TOK_TEXT] ? argv[TOK_TEXT] : "");
+ print_out(0, message);
+ return;
+ } else if(!strncmp("ERROR", argv[TOK_CMD], 6))
+ snprintf(message, MAXMSG, "-!- error %s",
+ argv[TOK_TEXT] ? argv[TOK_TEXT] : "unknown");
+ else if(!strncmp("JOIN", argv[TOK_CMD], 5)) {
+ if(argv[TOK_TEXT]!=NULL){
+ p = strchr(argv[TOK_TEXT], ' ');
+ if(p)
+ *p = 0;
+ }
+ argv[TOK_CHAN] = argv[TOK_TEXT];
+ snprintf(message, MAXMSG, "-!- %s(%s) has joined %s",
+ argv[TOK_NICKSRV], argv[TOK_USER], argv[TOK_TEXT]);
+ } else if(!strncmp("PART", argv[TOK_CMD], 5)) {
+ snprintf(message, MAXMSG, "-!- %s(%s) has left %s",
+ argv[TOK_NICKSRV], argv[TOK_USER], argv[TOK_CHAN]);
+ } else if(!strncmp("MODE", argv[TOK_CMD], 5))
+ snprintf(message, MAXMSG, "-!- %s changed mode/%s -> %s %s",
+ argv[TOK_NICKSRV], argv[TOK_CMD + 1],
+ argv[TOK_CMD + 2], argv[TOK_CMD + 3]);
+ else if(!strncmp("QUIT", argv[TOK_CMD], 5))
+ snprintf(message, MAXMSG, "-!- %s(%s) has quit \"%s\"",
+ argv[TOK_NICKSRV], argv[TOK_USER],
+ argv[TOK_TEXT] ? argv[TOK_TEXT] : "");
+ else if(!strncmp("NICK", argv[TOK_CMD], 5))
+ snprintf(message, MAXMSG, "-!- %s changed nick to %s",
+ argv[TOK_NICKSRV], argv[TOK_TEXT]);
+ else if(!strncmp("TOPIC", argv[TOK_CMD], 6))
+ snprintf(message, MAXMSG, "-!- %s changed topic to \"%s\"",
+ argv[TOK_NICKSRV], argv[TOK_TEXT] ? argv[TOK_TEXT] : "");
+ else if(!strncmp("KICK", argv[TOK_CMD], 5))
+ snprintf(message, MAXMSG, "-!- %s kicked %s (\"%s\")",
+ argv[TOK_NICKSRV], argv[TOK_ARG],
+ argv[TOK_TEXT] ? argv[TOK_TEXT] : "");
+ else if(!strncmp("NOTICE", argv[TOK_CMD], 7))
+ snprintf(message, MAXMSG, "-!- \"%s\")",
+ argv[TOK_TEXT] ? argv[TOK_TEXT] : "");
+ else if(!strncmp("PRIVMSG", argv[TOK_CMD], 8))
+ snprintf(message, MAXMSG, "<%s> %s",
+ argv[TOK_NICKSRV], argv[TOK_TEXT] ? argv[TOK_TEXT] : "");
+ if(!argv[TOK_CHAN] || !strncmp(argv[TOK_CHAN], nick, strlen(nick)))
+ print_out(argv[TOK_NICKSRV], message);
+ else
+ print_out(argv[TOK_CHAN], message);
+}
+
+static int
+read_line(int fd, unsigned int res_len, char *buf)
+{
+ unsigned int i = 0;
+ char c;
+ do {
+ if(read(fd, &c, sizeof(char)) != sizeof(char))
+ return -1;
+ buf[i++] = c;
+ }
+ while(c != '\n' && i < res_len);
+ buf[i - 1] = 0; /* eliminates '\n' */
+ return 0;
+}
+
+static void
+handle_server_output()
+{
+ static char buf[MAXMSG];
+ if(read_line(irc, MAXMSG, buf) == -1) {
+ perror("sic: remote host closed connection");
+ exit(EXIT_FAILURE);
+ }
+ proc_server_cmd(buf);
+}
+
+int
+main(int argc, char *argv[])
+{
+ char address[256];
+ char *password = NULL;
+ char *fullname = NULL;
+ char ping_msg[512], buf[MAXMSG];
+ int i, n, r, maxfd;
+ struct passwd *spw = getpwuid(getuid());
+ struct timeval tv;
+ fd_set rd;
+
+ if(!spw) {
+ fprintf(stderr,"sic: getpwuid() failed\n");
+ exit(EXIT_FAILURE);
+ }
+ snprintf(nick, sizeof(nick), "%s", spw->pw_name);
+
+ if(argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
+ goto Usage;
+
+ address[0] = 0;
+ for(i = 1; (i + 1 < argc) && (argv[i][0] == '-'); i++) {
+ switch (argv[i][1]) {
+ default:
+Usage:
+ fputs("usage: sic -a address [-n nick] [-f fullname] [-p password] [-v]\n",
+ stdout);
+ exit(EXIT_FAILURE);
+ break;
+ case 'a':
+ strncpy(address, argv[++i], sizeof(address));
+ break;
+ case 'n':
+ snprintf(nick, sizeof(nick), "%s", argv[++i]);
+ break;
+ case 'p':
+ password = argv[++i];
+ break;
+ case 'f':
+ fullname = argv[++i];
+ break;
+ }
+ }
+
+ if(!address[0])
+ goto Usage;
+
+ if((irc = tcpopen(address)) == -1) {
+ fprintf(stderr, "sic: cannot connect server '%s'\n", address);
+ exit(EXIT_FAILURE);
+ }
+ /* login */
+ if(password)
+ snprintf(message, MAXMSG,
+ "PASS %s\r\nNICK %s\r\nUSER %s localhost %s :%s\r\n",
+ password, nick, nick, host, fullname ? fullname : nick);
+ else
+ snprintf(message, MAXMSG, "NICK %s\r\nUSER %s localhost %s :%s\r\n",
+ nick, nick, host, fullname ? fullname : nick);
+ write(irc, message, strlen(message));
+
+ snprintf(ping_msg, sizeof(ping_msg), "PING %s\r\n", host);
+ for(;;) {
+ FD_ZERO(&rd);
+ maxfd = irc;
+ FD_SET(0, &rd);
+ FD_SET(irc, &rd);
+ tv.tv_sec = 120;
+ tv.tv_usec = 0;
+ r = select(maxfd + 1, &rd, 0, 0, &tv);
+ if(r < 0) {
+ if(errno == EINTR)
+ continue;
+ perror("sic: error on select()");
+ exit(EXIT_FAILURE);
+ } else if(r == 0) {
+ if(time(NULL) - last_response >= PING_TIMEOUT) {
+ print_out(NULL, "-!- sic shutting down: ping timeout");
+ exit(EXIT_FAILURE);
+ }
+ write(irc, ping_msg, strlen(ping_msg));
+ continue;
+ }
+ if(FD_ISSET(irc, &rd)) {
+ handle_server_output();
+ last_response = time(NULL);
+ }
+ if(FD_ISSET(0, &rd)) {
+ i = n = 0;
+ for(;;) {
+ if((i = getchar()) == EOF) {
+ perror("sic: broken pipe");
+ exit(EXIT_FAILURE);
+ }
+ if(i == '\n' || n >= sizeof(buf) - 1)
+ break;
+ buf[n++] = i;
+ }
+ buf[n] = 0;
+ proc_channels_input(buf);
+ }
+ }
+
+ return 0;
+}
projects / sic.git / commitdiff