1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 2007 Denis Vlasenko
7 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
14 enum { TIMEOUT = 20 };
16 typedef struct identd_buf_t {
19 char buf[64 - 2*sizeof(int)];
22 static const char *bogouser = "nobody";
24 static int new_peer(isrv_state_t *state, int fd)
27 identd_buf_t *buf = xzalloc(sizeof(*buf));
29 peer = isrv_register_peer(state, buf);
31 return 0; /* failure */
32 if (isrv_register_fd(state, peer, fd) < 0)
33 return peer; /* failure, unregister peer */
35 buf->fd_flag = fcntl(fd, F_GETFL, 0) | O_NONBLOCK;
36 isrv_want_rd(state, fd);
40 static int do_rd(int fd, void **paramp)
42 identd_buf_t *buf = *paramp;
44 int retval = 0; /* session is ok (so far) */
47 cur = buf->buf + buf->pos;
49 if (buf->fd_flag & O_NONBLOCK)
50 fcntl(fd, F_SETFL, buf->fd_flag);
51 sz = safe_read(fd, cur, sizeof(buf->buf) - buf->pos);
55 goto term; /* terminate this session if !EAGAIN */
60 buf->buf[buf->pos] = '\0';
61 p = strpbrk(cur, "\r\n");
64 if (!p && sz && buf->pos <= sizeof(buf->buf))
66 /* Terminate session. If we are in server mode, then
67 * fd is still in nonblocking mode - we never block here */
68 fdprintf(fd, "%s : USERID : UNIX : %s\r\n", buf->buf, bogouser);
71 retval = 1; /* terminate */
73 if (buf->fd_flag & O_NONBLOCK)
74 fcntl(fd, F_SETFL, buf->fd_flag & ~O_NONBLOCK);
78 static int do_timeout(void **paramp)
80 return 1; /* terminate session */
83 static void inetd_mode(void)
85 identd_buf_t *buf = xzalloc(sizeof(*buf));
86 /* We do NOT want nonblocking I/O here! */
87 buf->fd_flag = fcntl(0, F_GETFL, 0);
90 while (do_rd(0, (void*)&buf) == 0) /* repeat */;
93 int fakeidentd_main(int argc, char **argv)
103 const char *bind_address = NULL;
107 opt = getopt32(argc, argv, "fiwb:", &bind_address);
109 bogouser = argv[optind];
111 /* Daemonize if no -f or -i or -w */
112 bb_sanitize_stdio(!(opt & OPT_nodeamon));
113 if (!(opt & OPT_nodeamon)) {
114 openlog(applet_name, 0, LOG_DAEMON);
115 logmode = LOGMODE_SYSLOG;
118 if (opt & OPT_inetd) {
123 /* Ignore closed connections when writing */
124 signal(SIGPIPE, SIG_IGN);
126 if (opt & OPT_inetdwait) {
129 fd = create_and_bind_stream_or_die(bind_address,
130 bb_lookup_port("identd", "tcp", 113));
134 isrv_run(fd, new_peer, do_rd, /*do_wr:*/ NULL, do_timeout,
135 TIMEOUT, (opt & OPT_inetdwait) ? TIMEOUT : 0);