Contents of /tags/mkinitrd-6_3_3/busybox/networking/isrv_identd.c
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Wed Dec 15 21:43:57 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 3478 byte(s)
Wed Dec 15 21:43:57 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 3478 byte(s)
tagged 'mkinitrd-6_3_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Fake identd server. |
4 | * |
5 | * Copyright (C) 2007 Denys Vlasenko |
6 | * |
7 | * Licensed under GPL version 2, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | #include <syslog.h> |
12 | #include "isrv.h" |
13 | |
14 | enum { TIMEOUT = 20 }; |
15 | |
16 | typedef struct identd_buf_t { |
17 | int pos; |
18 | int fd_flag; |
19 | char buf[64 - 2*sizeof(int)]; |
20 | } identd_buf_t; |
21 | |
22 | #define bogouser bb_common_bufsiz1 |
23 | |
24 | static int new_peer(isrv_state_t *state, int fd) |
25 | { |
26 | int peer; |
27 | identd_buf_t *buf = xzalloc(sizeof(*buf)); |
28 | |
29 | peer = isrv_register_peer(state, buf); |
30 | if (peer < 0) |
31 | return 0; /* failure */ |
32 | if (isrv_register_fd(state, peer, fd) < 0) |
33 | return peer; /* failure, unregister peer */ |
34 | |
35 | buf->fd_flag = fcntl(fd, F_GETFL) | O_NONBLOCK; |
36 | isrv_want_rd(state, fd); |
37 | return 0; |
38 | } |
39 | |
40 | static int do_rd(int fd, void **paramp) |
41 | { |
42 | identd_buf_t *buf = *paramp; |
43 | char *cur, *p; |
44 | int retval = 0; /* session is ok (so far) */ |
45 | int sz; |
46 | |
47 | cur = buf->buf + buf->pos; |
48 | |
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); |
52 | |
53 | if (sz < 0) { |
54 | if (errno != EAGAIN) |
55 | goto term; /* terminate this session if !EAGAIN */ |
56 | goto ok; |
57 | } |
58 | |
59 | buf->pos += sz; |
60 | buf->buf[buf->pos] = '\0'; |
61 | p = strpbrk(cur, "\r\n"); |
62 | if (p) |
63 | *p = '\0'; |
64 | if (!p && sz && buf->pos <= (int)sizeof(buf->buf)) |
65 | goto ok; |
66 | /* Terminate session. If we are in server mode, then |
67 | * fd is still in nonblocking mode - we never block here */ |
68 | if (fd == 0) fd++; /* inetd mode? then write to fd 1 */ |
69 | fdprintf(fd, "%s : USERID : UNIX : %s\r\n", buf->buf, bogouser); |
70 | term: |
71 | free(buf); |
72 | retval = 1; /* terminate */ |
73 | ok: |
74 | if (buf->fd_flag & O_NONBLOCK) |
75 | fcntl(fd, F_SETFL, buf->fd_flag & ~O_NONBLOCK); |
76 | return retval; |
77 | } |
78 | |
79 | static int do_timeout(void **paramp UNUSED_PARAM) |
80 | { |
81 | return 1; /* terminate session */ |
82 | } |
83 | |
84 | static void inetd_mode(void) |
85 | { |
86 | identd_buf_t *buf = xzalloc(sizeof(*buf)); |
87 | /* buf->pos = 0; - xzalloc did it */ |
88 | /* We do NOT want nonblocking I/O here! */ |
89 | /* buf->fd_flag = 0; - xzalloc did it */ |
90 | do |
91 | alarm(TIMEOUT); |
92 | while (do_rd(0, (void*)&buf) == 0); |
93 | } |
94 | |
95 | int fakeidentd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
96 | int fakeidentd_main(int argc UNUSED_PARAM, char **argv) |
97 | { |
98 | enum { |
99 | OPT_foreground = 0x1, |
100 | OPT_inetd = 0x2, |
101 | OPT_inetdwait = 0x4, |
102 | OPT_fiw = 0x7, |
103 | OPT_bindaddr = 0x8, |
104 | }; |
105 | |
106 | const char *bind_address = NULL; |
107 | unsigned opt; |
108 | int fd; |
109 | |
110 | opt = getopt32(argv, "fiwb:", &bind_address); |
111 | strcpy(bogouser, "nobody"); |
112 | if (argv[optind]) |
113 | strncpy(bogouser, argv[optind], sizeof(bogouser)); |
114 | |
115 | /* Daemonize if no -f and no -i and no -w */ |
116 | if (!(opt & OPT_fiw)) |
117 | bb_daemonize_or_rexec(0, argv); |
118 | |
119 | /* Where to log in inetd modes? "Classic" inetd |
120 | * probably has its stderr /dev/null'ed (we need log to syslog?), |
121 | * but daemontools-like utilities usually expect that children |
122 | * log to stderr. I like daemontools more. Go their way. |
123 | * (Or maybe we need yet another option "log to syslog") */ |
124 | if (!(opt & OPT_fiw) /* || (opt & OPT_syslog) */) { |
125 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
126 | logmode = LOGMODE_SYSLOG; |
127 | } |
128 | |
129 | if (opt & OPT_inetd) { |
130 | inetd_mode(); |
131 | return 0; |
132 | } |
133 | |
134 | /* Ignore closed connections when writing */ |
135 | signal(SIGPIPE, SIG_IGN); |
136 | |
137 | fd = 0; |
138 | if (!(opt & OPT_inetdwait)) { |
139 | fd = create_and_bind_stream_or_die(bind_address, |
140 | bb_lookup_port("identd", "tcp", 113)); |
141 | xlisten(fd, 5); |
142 | } |
143 | |
144 | isrv_run(fd, new_peer, do_rd, /*do_wr:*/ NULL, do_timeout, |
145 | TIMEOUT, (opt & OPT_inetdwait) ? TIMEOUT : 0); |
146 | return 0; |
147 | } |