e82f7154 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: fw.c,v 1.1 1999/07/01 08:56:23 mdw Exp $ |
4 | * |
5 | * Port forwarding thingy |
6 | * |
7 | * (c) 1999 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
14 | * `fw' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `fw' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with `fw'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: fw.c,v $ |
32 | * Revision 1.1 1999/07/01 08:56:23 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include "config.h" |
40 | |
41 | #include <ctype.h> |
42 | #include <errno.h> |
43 | #include <stdio.h> |
44 | #include <stdlib.h> |
45 | #include <string.h> |
46 | |
47 | #include <unistd.h> |
48 | #include <syslog.h> |
49 | |
50 | #include <mLib/mdwopt.h> |
51 | #include <mLib/quis.h> |
52 | #include <mLib/report.h> |
53 | #include <mLib/sel.h> |
54 | #include <mLib/sub.h> |
55 | |
56 | #include "acl.h" |
57 | #include "bres.h" |
58 | #include "conf.h" |
59 | #include "listener.h" |
60 | #include "scan.h" |
61 | |
62 | /*----- Static variables --------------------------------------------------*/ |
63 | |
64 | sel_state *sel; /* Multiplexor for nonblocking I/O */ |
65 | |
66 | /*----- Main code ---------------------------------------------------------*/ |
67 | |
68 | /* --- Standard GNU help options --- */ |
69 | |
70 | static void version(FILE *fp) |
71 | { |
72 | fprintf(fp, "%s version " VERSION "\n", QUIS); |
73 | } |
74 | |
75 | static void usage(FILE *fp) |
76 | { |
77 | fprintf(stderr, "Usage: %s [-d] [-f file] [config statements...]\n", |
78 | QUIS); |
79 | } |
80 | |
81 | static void help(FILE *fp) |
82 | { |
83 | version(fp); |
84 | fputc('\n', fp); |
85 | usage(fp); |
86 | fputs("\n\ |
87 | A fairly full-featured port-forwarder. Options available are:\n\ |
88 | \n\ |
89 | -h, --help Display this help message.\n\ |
90 | -v, --version Display the program's version number.\n\ |
91 | -u, --usage Display a terse usage summary.\n\ |
92 | \n\ |
93 | -f, --file=FILE Read configuration from a file.\n\ |
94 | -d, --dump Dump the configuration to standard output.\n\ |
95 | \n\ |
96 | Configuration may be supplied in one or more configuration files, or on\n\ |
97 | the command line (or both). If no `-f' option is present, and no\n\ |
98 | configuration is given on the command line, the standard input stream is\n\ |
99 | read.\n\ |
100 | \n\ |
101 | Configuration is free-form. Comments begin with a `#' character and\n\ |
102 | continue to the end of the line. When reading from the command line,\n\ |
103 | each argument is considered a separate line. See the manual page for the\n\ |
104 | complete syntax.\n\ |
105 | ", fp); |
106 | } |
107 | |
108 | /* --- @main@ --- * |
109 | * |
110 | * Arguments: @int argc@ = number of command line arguments |
111 | * @char *argv[]@ = vector of argument strings |
112 | * |
113 | * Returns: --- |
114 | * |
115 | * Use: Simple port-forwarding server. |
116 | */ |
117 | |
118 | int main(int argc, char *argv[]) |
119 | { |
120 | unsigned f = 0; |
121 | sel_state sst; |
122 | |
123 | enum { |
124 | f_bogus = 1, |
125 | f_file = 2, |
126 | f_dump = 4, |
127 | f_fork = 8 |
128 | }; |
129 | |
130 | /* --- Initialize things --- */ |
131 | |
132 | ego(argv[0]); |
133 | sel = &sst; |
134 | sel_init(sel); |
135 | sub_init(); |
136 | bres_init(sel); |
137 | |
138 | /* --- Parse command line options --- */ |
139 | |
140 | for (;;) { |
141 | static struct option opts[] = { |
142 | |
143 | /* --- Standard GNU help options --- */ |
144 | |
145 | { "help", 0, 0, 'h' }, |
146 | { "version", 0, 0, 'v' }, |
147 | { "usage", 0, 0, 'u' }, |
148 | |
149 | /* --- Other useful arguments --- */ |
150 | |
151 | { "file", OPTF_ARGREQ, 0, 'f' }, |
152 | { "dump", 0, 0, 'd' }, |
153 | { "fork", 0, 0, 'b' }, |
154 | { "background", 0, 0, 'b' }, |
155 | |
156 | /* --- Magic terminator --- */ |
157 | |
158 | { 0, 0, 0, 0 } |
159 | }; |
160 | int i = mdwopt(argc, argv, "hvu f:db", opts, 0, 0, 0); |
161 | |
162 | if (i < 0) |
163 | break; |
164 | switch (i) { |
165 | case 'h': |
166 | help(stdout); |
167 | exit(0); |
168 | break; |
169 | case 'v': |
170 | version(stdout); |
171 | exit(0); |
172 | break; |
173 | case 'u': |
174 | usage(stdout); |
175 | exit(0); |
176 | break; |
177 | case 'f': { |
178 | scan_filectx ctx; |
179 | FILE *fp; |
180 | if ((fp = fopen(optarg, "r")) == 0) |
181 | die(1, "couldn't open file `%s': %s", optarg, strerror(errno)); |
182 | scan_fileinit(&ctx, fp, optarg); |
183 | conf_parse(&ctx); |
184 | fclose(fp); |
185 | f |= f_file; |
186 | } break; |
187 | case 'd': |
188 | f |= f_dump; |
189 | break; |
190 | case 'b': |
191 | f |= f_fork; |
192 | break; |
193 | default: |
194 | f |= f_bogus; |
195 | break; |
196 | } |
197 | } |
198 | |
199 | if (f & f_bogus) { |
200 | usage(stderr); |
201 | exit(1); |
202 | } |
203 | |
204 | /* --- Deal with the remaining arguments --- */ |
205 | |
206 | if (optind == argc) { |
207 | if (f & f_file) |
208 | /* Cool */; |
209 | else if (isatty(STDIN_FILENO)) { |
210 | moan("no configuration given and stdin is a terminal."); |
211 | moan("type `%s --help' for usage information.", QUIS); |
212 | exit(1); |
213 | } else { |
214 | scan_filectx ctx; |
215 | scan_fileinit(&ctx, stdin, "<stdin>"); |
216 | conf_parse(&ctx); |
217 | } |
218 | } else { |
219 | scan_argvctx ctx; |
220 | scan_argvinit(&ctx, argv + optind); |
221 | conf_parse(&ctx); |
222 | } |
223 | |
224 | /* --- Dump out the state --- */ |
225 | |
226 | if (f & f_dump) { |
227 | sel_file *s; |
228 | fputs("global acl:\n", stdout); |
229 | acl_dump(0, stdout); |
230 | for (s = sel->files; s; s = s->next) |
231 | listener_dump((listener *)s, stdout); |
232 | exit(0); |
233 | } |
234 | |
235 | /* --- Fork into the background --- */ |
236 | |
237 | if (f & f_fork) { |
238 | pid_t kid; |
239 | |
240 | kid = fork(); |
241 | if (kid == -1) |
242 | die(1, "couldn't fork: %s", strerror(errno)); |
243 | if (kid != 0) |
244 | _exit(0); |
245 | |
246 | close(0); close(1); close(2); |
247 | setsid(); |
248 | |
249 | kid = fork(); |
250 | if (kid != 0) |
251 | _exit(0); |
252 | } |
253 | |
254 | /* --- Let rip --- */ |
255 | |
256 | openlog(QUIS, 0, LOG_DAEMON); |
257 | for (;;) |
258 | sel_select(sel); |
259 | return (0); |
260 | } |
261 | |
262 | /*----- That's all, folks -------------------------------------------------*/ |