410c8acf |
1 | /* -*-c-*- |
2 | * |
73189848 |
3 | * $Id: client.c,v 1.2 2001/02/04 01:17:54 mdw Exp $ |
410c8acf |
4 | * |
5 | * Client for TrIPE |
6 | * |
7 | * (c) 2001 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Trivial IP Encryption (TrIPE). |
13 | * |
14 | * TrIPE 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 | * TrIPE 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 TrIPE; 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: client.c,v $ |
73189848 |
32 | * Revision 1.2 2001/02/04 01:17:54 mdw |
33 | * Create a configuration header file to tidy up command lines. |
34 | * |
410c8acf |
35 | * Revision 1.1 2001/02/03 20:26:37 mdw |
36 | * Initial checkin. |
37 | * |
38 | */ |
39 | |
40 | /*----- Header files ------------------------------------------------------*/ |
41 | |
73189848 |
42 | #include "config.h" |
43 | |
410c8acf |
44 | #include <ctype.h> |
45 | #include <errno.h> |
46 | #include <signal.h> |
47 | #include <stdio.h> |
48 | #include <stdlib.h> |
49 | #include <string.h> |
50 | #include <time.h> |
51 | |
52 | #include <sys/types.h> |
53 | #include <sys/time.h> |
54 | #include <unistd.h> |
55 | #include <fcntl.h> |
56 | #include <sys/wait.h> |
57 | #include <syslog.h> |
58 | |
59 | #include <sys/socket.h> |
60 | #include <sys/un.h> |
61 | #include <arpa/inet.h> |
62 | #include <netdb.h> |
63 | |
64 | #include <mLib/alloc.h> |
65 | #include <mLib/darray.h> |
66 | #include <mLib/dstr.h> |
67 | #include <mLib/lbuf.h> |
68 | #include <mLib/mdwopt.h> |
69 | #include <mLib/quis.h> |
70 | #include <mLib/report.h> |
71 | #include <mLib/sel.h> |
72 | #include <mLib/selbuf.h> |
73 | #include <mLib/str.h> |
74 | |
75 | #include "util.h" |
76 | |
77 | #undef sun |
78 | |
79 | /*----- Data structures ---------------------------------------------------*/ |
80 | |
81 | #ifndef STRING_V |
82 | # define STRING_V |
83 | DA_DECL(string_v, char *); |
84 | #endif |
85 | |
86 | /*----- Static variables --------------------------------------------------*/ |
87 | |
88 | static FILE *logfp = 0; |
89 | static unsigned f = 0; |
90 | static int fd; |
91 | |
92 | #define f_bogus 1u |
93 | #define f_spawn 2u |
94 | #define f_daemon 4u |
95 | #define f_spawnopts 8u |
96 | #define f_syslog 16u |
97 | #define f_command 32u |
98 | #define f_noinput 64u |
99 | #define f_warn 128u |
100 | #define f_uclose 256u |
101 | |
102 | /*----- Main code ---------------------------------------------------------*/ |
103 | |
104 | static void reap(int sig) |
105 | { |
106 | int s; |
107 | int e = errno; |
108 | while (waitpid(-1, &s, WNOHANG) > 0) |
109 | ; |
110 | errno = e; |
111 | } |
112 | |
113 | static void writelog(const char *cat, const char *msg) |
114 | { |
115 | char buf[256]; |
116 | time_t t = time(0); |
117 | struct tm *tm = localtime(&t); |
118 | strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm); |
119 | fprintf(logfp, "%s %s: %s\n", buf, cat, msg); |
120 | } |
121 | |
122 | static void cline(char *p, void *b) |
123 | { |
124 | char *q; |
125 | if (!p) { |
126 | if (f & f_command) |
127 | die(EXIT_FAILURE, "server dropped the connection"); |
128 | exit(0); |
129 | } |
130 | q = str_getword(&p); |
131 | if (!q) |
132 | return; |
133 | if (strcmp(q, "WARN") == 0) { |
134 | if (f & f_syslog) |
135 | syslog(LOG_WARNING, "%s", p); |
136 | if (logfp) |
137 | writelog("warning", p); |
138 | if (f & f_warn) |
139 | fprintf(stderr, "Warning: %s\n", p); |
140 | } else if (strcmp(q, "TRACE") == 0) { |
141 | if (f & f_syslog) |
142 | syslog(LOG_DEBUG, "%s", p); |
143 | if (logfp) |
144 | writelog("debug", p); |
145 | } else if (!(f & f_command)) { |
146 | if (f & f_syslog) |
147 | syslog(LOG_ERR, "unexpected output `%s %s'", q, p); |
148 | if (logfp) { |
149 | dstr d = DSTR_INIT; |
150 | dstr_putf(&d, "unexpected output `%s %s'", q, p); |
151 | writelog("error", d.buf); |
152 | dstr_destroy(&d); |
153 | } |
154 | } else if (strcmp(q, "ERR") == 0) |
155 | die(EXIT_FAILURE, "%s", p); |
156 | else if (strcmp(q, "INFO") == 0) |
157 | puts(p); |
158 | else if (strcmp(q, "OK") == 0) |
159 | exit(0); |
160 | else |
161 | die(EXIT_FAILURE, "unexpected output `%s %s'", q, p); |
162 | } |
163 | |
164 | static void sline(char *p, void *b) |
165 | { |
166 | if (!p) { |
167 | if (!(f & f_uclose)) |
168 | moan("server closed the connection"); |
169 | exit(0); |
170 | } |
171 | puts(p); |
172 | } |
173 | |
174 | static void uline(char *p, void *b) |
175 | { |
176 | size_t sz; |
177 | if (!p) { |
178 | selbuf_destroy(b); |
179 | shutdown(fd, 1); |
180 | f |= f_uclose; |
181 | } else { |
182 | sz = strlen(p); |
183 | p[sz] = '\n'; |
184 | write(fd, p, sz + 1); |
185 | } |
186 | } |
187 | |
188 | static void version(FILE *fp) |
189 | { |
190 | pquis(fp, "$, TrIPE version " VERSION "\n"); |
191 | } |
192 | |
193 | static void usage(FILE *fp) |
194 | { |
195 | pquis(fp, "\ |
196 | Usage:\n\ |
197 | $ [-w] [-options] [command [args]...]\n\ |
198 | $ [-Dl] [-f file] [-options]\n\ |
199 | Options:\n\ |
200 | [-s] [-d directory] [-a socket] [-p program] [-S arg,arg,...]\n\ |
201 | "); |
202 | } |
203 | |
204 | static void help(FILE *fp) |
205 | { |
206 | version(fp); |
207 | fputc('\n', fp); |
208 | usage(fp); |
209 | fputs("\ |
210 | \n\ |
211 | Options in full:\n\ |
212 | \n\ |
213 | -h, --help Show this help text.\n\ |
214 | -v, --version Show version number.\n\ |
215 | -u, --usage Show brief usage message.\n\ |
216 | \n\ |
217 | -D, --daemon Become a background task after connecting.\n\ |
218 | -d, --directory=DIR Select current directory [default /var/lib/tripe]\n\ |
219 | -a, --admin-socket=FILE Select socket to connect to.\n\ |
220 | \n\ |
221 | -s, --spawn Start server rather than connecting.\n\ |
222 | -p, --spawn-path=PATH Specify path to executable.\n\ |
223 | -S, --spawn-args=ARGS Specify comma-separated arguments.\n\ |
224 | \n\ |
225 | -l, --syslog Log messages to system log.\n\ |
226 | -f, --logfile=FILE Log messages to FILE.\n\ |
227 | -w, --warnings Show warnings when running commands.\n\ |
228 | ", fp); |
229 | } |
230 | |
231 | int main(int argc, char *argv[]) |
232 | { |
233 | const char *dir = "/var/lib/tripe"; |
234 | const char *sock = "tripesock"; |
235 | const char *spawnpath = "tripe"; |
236 | string_v spawnopts = DA_INIT; |
237 | char *p; |
238 | |
239 | ego(argv[0]); |
240 | |
241 | if ((p = getenv("TRIPEDIR")) != 0) |
242 | dir = p; |
243 | |
244 | /* --- Parse the arguments --- */ |
245 | |
246 | for (;;) { |
247 | static const struct option opts[] = { |
248 | { "help", 0, 0, 'h' }, |
249 | { "version", 0, 0, 'v' }, |
250 | { "usage", 0, 0, 'u' }, |
251 | { "daemon", 0, 0, 'D' }, |
252 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
253 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
254 | { "spawn", 0, 0, 's' }, |
255 | { "spawn-path", OPTF_ARGREQ, 0, 'p' }, |
256 | { "spawn-args", OPTF_ARGREQ, 0, 'S' }, |
257 | { "syslog", 0, 0, 'l' }, |
258 | { "logfile", OPTF_ARGREQ, 0, 'f' }, |
259 | { "warnings", 0, 0, 'w' }, |
260 | { 0, 0, 0, 0 } |
261 | }; |
262 | |
263 | int i = mdwopt(argc, argv, "hvuDd:a:sp:S:lwf:n", opts, 0, 0, 0); |
264 | if (i < 0) |
265 | break; |
266 | switch (i) { |
267 | case 'h': |
268 | help(stdout); |
269 | exit(0); |
270 | case 'v': |
271 | version(stdout); |
272 | exit(0); |
273 | case 'u': |
274 | usage(stdout); |
275 | exit(0); |
276 | case 'D': |
277 | f |= f_daemon | f_noinput; |
278 | break; |
279 | case 'd': |
280 | dir = optarg; |
281 | break; |
282 | case 'a': |
283 | sock = optarg; |
284 | break; |
285 | case 's': |
286 | f |= f_spawn; |
287 | break; |
288 | case 'p': |
289 | f |= f_spawn; |
290 | spawnpath = optarg; |
291 | break; |
292 | case 'S': |
293 | f |= f_spawn | f_spawnopts; |
294 | for (p = strtok(optarg, ","); p; p = strtok(0, ",")) |
295 | DA_PUSH(&spawnopts, p); |
296 | break; |
297 | case 'l': |
298 | f |= f_syslog | f_noinput; |
299 | break; |
300 | case 'w': |
301 | f |= f_warn; |
302 | break; |
303 | case 'f': |
304 | if (logfp) |
305 | fclose(logfp); |
306 | if ((logfp = fopen(optarg, "a")) == 0) { |
307 | die(EXIT_FAILURE, "error opening logfile `%s': %s", |
308 | optarg, strerror(errno)); |
309 | } |
310 | f |= f_noinput; |
311 | break; |
312 | default: |
313 | f |= f_bogus; |
314 | break; |
315 | } |
316 | } |
317 | if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) { |
318 | usage(stderr); |
319 | exit(EXIT_FAILURE); |
320 | } |
321 | |
322 | /* --- Set the world up --- */ |
323 | |
324 | if (chdir(dir)) { |
325 | die(EXIT_FAILURE, "couldn't set current directory to `%s': %s", |
326 | dir, strerror(errno)); |
327 | } |
328 | |
329 | /* --- Connect to the server --- */ |
330 | |
331 | if (f & f_spawn) { |
332 | int pfd[2]; |
333 | pid_t kid; |
334 | struct sigaction sa; |
335 | sigset_t newmask, oldmask; |
336 | |
337 | sa.sa_handler = reap; |
338 | sigemptyset(&sa.sa_mask); |
339 | sa.sa_flags = SA_NOCLDSTOP; |
340 | #ifdef SA_RESTART |
341 | sa.sa_flags |= SA_RESTART; |
342 | #endif |
343 | sigaction(SIGCHLD, &sa, 0); |
344 | |
345 | DA_UNSHIFT(&spawnopts, (char *)spawnpath); |
346 | if (!(f & f_spawnopts)) { |
347 | DA_PUSH(&spawnopts, "-d."); |
348 | DA_PUSH(&spawnopts, "-a"); |
349 | DA_PUSH(&spawnopts, (char *)sock); |
350 | } |
351 | DA_PUSH(&spawnopts, 0); |
352 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd)) |
353 | die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno)); |
354 | sigemptyset(&newmask); |
355 | sigaddset(&newmask, SIGCHLD); |
356 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
357 | if ((kid = fork()) < 0) |
358 | die(EXIT_FAILURE, "fork failed: %s", strerror(errno)); |
359 | if (!kid) { |
360 | dup2(pfd[1], STDIN_FILENO); |
361 | dup2(pfd[1], STDOUT_FILENO); |
362 | close(pfd[1]); |
363 | close(pfd[0]); |
364 | execvp(DA(&spawnopts)[0], DA(&spawnopts)); |
365 | die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno)); |
366 | } |
367 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
368 | fd = pfd[0]; |
369 | close(pfd[1]); |
370 | } else { |
371 | struct sockaddr_un sun; |
372 | size_t sz = strlen(sock) + 1; |
373 | if (sz > sizeof(sun.sun_path)) |
374 | die(EXIT_FAILURE, "socket name `%s' too long", sock); |
375 | memset(&sun, 0, sizeof(sun)); |
376 | sun.sun_family = AF_UNIX; |
377 | memcpy(sun.sun_path, sock, sz); |
378 | sz += offsetof(struct sockaddr_un, sun_path); |
379 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
380 | die(EXIT_FAILURE, "error making socket: %s", strerror(errno)); |
381 | if (connect(fd, (struct sockaddr *)&sun, sz)) { |
382 | die(EXIT_FAILURE, "error connecting to `%s': %s", |
383 | sock, strerror(errno)); |
384 | } |
385 | } |
386 | |
387 | if (f & f_daemon) { |
388 | if (u_daemon()) |
389 | die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno)); |
390 | } |
391 | |
392 | /* --- If we're meant to be interactive, do that --- */ |
393 | |
394 | if (!(f & f_noinput) && optind == argc) { |
395 | sel_state sel; |
396 | selbuf bu, bs; |
397 | |
398 | sel_init(&sel); |
399 | selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu); |
400 | selbuf_init(&bs, &sel, fd, sline, &bs); |
401 | for (;;) { |
402 | if (sel_select(&sel)) |
403 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
404 | } |
405 | } |
406 | |
407 | /* --- If there's a command, submit it --- */ |
408 | |
409 | if (optind < argc) { |
410 | dstr d = DSTR_INIT; |
411 | dstr_puts(&d, argv[optind++]); |
412 | while (optind < argc) { |
413 | dstr_putc(&d, ' '); |
414 | dstr_puts(&d, argv[optind++]); |
415 | } |
416 | dstr_putc(&d, '\n'); |
417 | write(fd, d.buf, d.len); |
418 | shutdown(fd, 1); |
419 | dstr_destroy(&d); |
420 | f |= f_command; |
421 | } |
422 | |
423 | /* --- Pull everything else out of the box --- */ |
424 | |
425 | { |
426 | lbuf b; |
427 | lbuf_init(&b, cline, 0); |
428 | if (f & f_syslog) |
429 | openlog(QUIS, 0, LOG_DAEMON); |
430 | for (;;) { |
431 | size_t sz = lbuf_free(&b, &p); |
432 | ssize_t n = read(fd, p, sz); |
433 | if (n < 0) |
434 | die(EXIT_FAILURE, "read failed: %s", strerror(errno)); |
435 | if (n == 0) |
436 | break; |
437 | lbuf_flush(&b, p, n); |
438 | } |
439 | lbuf_close(&b); |
440 | } |
441 | |
442 | return (0); |
443 | } |
444 | |
445 | /*----- That's all, folks -------------------------------------------------*/ |