Commit | Line | Data |
---|---|---|
c55a77db PH |
1 | /* A little hacked up program that listens on a given port and allows a script |
2 | to play the part of a remote MTA for testing purposes. This scripted version is | |
3 | hacked from my original interactive version. A further hack allows it to listen | |
4 | on a Unix domain socket as an alternative to a TCP/IP port. | |
5 | ||
6 | In an IPv6 world, listening happens on both an IPv6 and an IPv4 socket, always | |
7 | on all interfaces, unless the option -noipv6 is given. */ | |
8 | ||
9 | /* ANSI C standard includes */ | |
10 | ||
11 | #include <ctype.h> | |
12 | #include <signal.h> | |
13 | #include <stdarg.h> | |
14 | #include <stddef.h> | |
15 | #include <stdio.h> | |
16 | #include <stdlib.h> | |
17 | #include <string.h> | |
18 | #include <time.h> | |
19 | ||
20 | /* Unix includes */ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <dirent.h> | |
24 | #include <sys/types.h> | |
25 | ||
26 | #include <netinet/in_systm.h> | |
27 | #include <netinet/in.h> | |
28 | #include <netinet/ip.h> | |
29 | ||
30 | #ifdef HAVE_NETINET_IP_VAR_H | |
31 | #include <netinet/ip_var.h> | |
32 | #endif | |
33 | ||
34 | #include <netdb.h> | |
35 | #include <arpa/inet.h> | |
36 | #include <sys/time.h> | |
37 | #include <sys/resource.h> | |
38 | #include <sys/socket.h> | |
39 | #include <sys/un.h> | |
40 | #include <sys/stat.h> | |
41 | #include <fcntl.h> | |
42 | #include <unistd.h> | |
43 | #include <utime.h> | |
44 | ||
45 | #ifdef AF_INET6 | |
a719fce4 | 46 | # define HAVE_IPV6 1 |
c55a77db PH |
47 | #endif |
48 | ||
49 | #ifndef S_ADDR_TYPE | |
a719fce4 JH |
50 | # define S_ADDR_TYPE u_long |
51 | #endif | |
52 | ||
53 | #ifndef CS | |
54 | # define CS (char *) | |
c55a77db PH |
55 | #endif |
56 | ||
57 | ||
58 | typedef struct line { | |
59 | struct line *next; | |
60 | char line[1]; | |
61 | } line; | |
62 | ||
63 | ||
64 | /************************************************* | |
65 | * SIGALRM handler - crash out * | |
66 | *************************************************/ | |
67 | ||
68 | static void | |
69 | sigalrm_handler(int sig) | |
70 | { | |
71 | sig = sig; /* Keep picky compilers happy */ | |
72 | printf("\nServer timed out\n"); | |
73 | exit(99); | |
74 | } | |
75 | ||
76 | ||
77 | /************************************************* | |
78 | * Get textual IP address * | |
79 | *************************************************/ | |
80 | ||
81 | /* This function is copied from Exim */ | |
82 | ||
83 | char * | |
84 | host_ntoa(const void *arg, char *buffer) | |
85 | { | |
86 | char *yield; | |
87 | ||
88 | /* The new world. It is annoying that we have to fish out the address from | |
89 | different places in the block, depending on what kind of address it is. It | |
90 | is also a pain that inet_ntop() returns a const char *, whereas the IPv4 | |
91 | function inet_ntoa() returns just char *, and some picky compilers insist | |
92 | on warning if one assigns a const char * to a char *. Hence the casts. */ | |
93 | ||
94 | #if HAVE_IPV6 | |
95 | char addr_buffer[46]; | |
96 | int family = ((struct sockaddr *)arg)->sa_family; | |
97 | if (family == AF_INET6) | |
98 | { | |
99 | struct sockaddr_in6 *sk = (struct sockaddr_in6 *)arg; | |
100 | yield = (char *)inet_ntop(family, &(sk->sin6_addr), addr_buffer, | |
101 | sizeof(addr_buffer)); | |
102 | } | |
103 | else | |
104 | { | |
105 | struct sockaddr_in *sk = (struct sockaddr_in *)arg; | |
106 | yield = (char *)inet_ntop(family, &(sk->sin_addr), addr_buffer, | |
107 | sizeof(addr_buffer)); | |
108 | } | |
109 | ||
110 | /* If the result is a mapped IPv4 address, show it in V4 format. */ | |
111 | ||
112 | if (strncmp(yield, "::ffff:", 7) == 0) yield += 7; | |
113 | ||
114 | #else /* HAVE_IPV6 */ | |
115 | ||
116 | /* The old world */ | |
117 | ||
118 | yield = inet_ntoa(((struct sockaddr_in *)arg)->sin_addr); | |
119 | #endif | |
120 | ||
121 | strcpy(buffer, yield); | |
122 | return buffer; | |
123 | } | |
124 | ||
125 | ||
126 | /************************************************* | |
127 | * Main Program * | |
128 | *************************************************/ | |
129 | ||
130 | #define v6n 0 /* IPv6 socket number */ | |
131 | #define v4n 1 /* IPv4 socket number */ | |
132 | #define udn 2 /* Unix domain socket number */ | |
133 | #define skn 2 /* Potential number of sockets */ | |
134 | ||
135 | int main(int argc, char **argv) | |
136 | { | |
137 | int i; | |
138 | int port = 0; | |
139 | int listen_socket[3] = { -1, -1, -1 }; | |
140 | int accept_socket; | |
141 | int dup_accept_socket; | |
142 | int connection_count = 1; | |
143 | int count; | |
144 | int on = 1; | |
145 | int timeout = 5; | |
146 | int use_ipv4 = 1; | |
147 | int use_ipv6 = 1; | |
148 | int debug = 0; | |
149 | int na = 1; | |
150 | line *script = NULL; | |
151 | line *last = NULL; | |
152 | line *s; | |
153 | FILE *in, *out; | |
154 | ||
155 | char *sockname = NULL; | |
156 | unsigned char buffer[10240]; | |
157 | ||
158 | struct sockaddr_un sockun; /* don't use "sun" */ | |
159 | struct sockaddr_un sockun_accepted; | |
160 | int sockun_len = sizeof(sockun_accepted); | |
161 | ||
162 | #if HAVE_IPV6 | |
163 | struct sockaddr_in6 sin6; | |
164 | struct sockaddr_in6 accepted; | |
165 | struct in6_addr anyaddr6 = IN6ADDR_ANY_INIT ; | |
166 | #else | |
167 | struct sockaddr_in accepted; | |
168 | #endif | |
169 | ||
170 | /* Always need an IPv4 structure */ | |
171 | ||
172 | struct sockaddr_in sin4; | |
173 | ||
174 | int len = sizeof(accepted); | |
175 | ||
176 | ||
177 | /* Sort out the arguments */ | |
178 | ||
179 | while (na < argc && argv[na][0] == '-') | |
180 | { | |
181 | if (strcmp(argv[na], "-d") == 0) debug = 1; | |
182 | else if (strcmp(argv[na], "-t") == 0) timeout = atoi(argv[++na]); | |
183 | else if (strcmp(argv[na], "-noipv4") == 0) use_ipv4 = 0; | |
184 | else if (strcmp(argv[na], "-noipv6") == 0) use_ipv6 = 0; | |
185 | else | |
186 | { | |
187 | printf("server: unknown option %s\n", argv[na]); | |
188 | exit(1); | |
189 | } | |
190 | na++; | |
191 | } | |
192 | ||
193 | if (!use_ipv4 && !use_ipv6) | |
194 | { | |
195 | printf("server: -noipv4 and -noipv6 cannot both be given\n"); | |
196 | exit(1); | |
197 | } | |
198 | ||
199 | if (na >= argc) | |
200 | { | |
201 | printf("server: no port number or socket name given\n"); | |
202 | exit(1); | |
203 | } | |
204 | ||
205 | if (argv[na][0] == '/') | |
206 | { | |
207 | sockname = argv[na]; | |
208 | unlink(sockname); /* in case left lying around */ | |
209 | } | |
210 | else port = atoi(argv[na]); | |
211 | na++; | |
212 | ||
213 | if (na < argc) connection_count = atoi(argv[na]); | |
214 | ||
215 | ||
216 | /* Create sockets */ | |
217 | ||
218 | if (port == 0) /* Unix domain */ | |
219 | { | |
220 | if (debug) printf("Creating Unix domain socket\n"); | |
221 | listen_socket[udn] = socket(PF_UNIX, SOCK_STREAM, 0); | |
222 | if (listen_socket[udn] < 0) | |
223 | { | |
224 | printf("Unix domain socket creation failed: %s\n", strerror(errno)); | |
225 | exit(1); | |
226 | } | |
227 | } | |
228 | else | |
229 | { | |
230 | #if HAVE_IPV6 | |
231 | if (use_ipv6) | |
232 | { | |
233 | if (debug) printf("Creating IPv6 socket\n"); | |
234 | listen_socket[v6n] = socket(AF_INET6, SOCK_STREAM, 0); | |
235 | if (listen_socket[v6n] < 0) | |
236 | { | |
237 | printf("IPv6 socket creation failed: %s\n", strerror(errno)); | |
238 | exit(1); | |
239 | } | |
240 | ||
241 | /* If this is an IPv6 wildcard socket, set IPV6_V6ONLY if that option is | |
242 | available. */ | |
243 | ||
244 | #ifdef IPV6_V6ONLY | |
245 | if (setsockopt(listen_socket[v6n], IPPROTO_IPV6, IPV6_V6ONLY, (char *)(&on), | |
246 | sizeof(on)) < 0) | |
247 | printf("Setting IPV6_V6ONLY on IPv6 wildcard " | |
248 | "socket failed (%s): carrying on without it\n", strerror(errno)); | |
249 | #endif /* IPV6_V6ONLY */ | |
250 | } | |
251 | #endif /* HAVE_IPV6 */ | |
252 | ||
253 | /* Create an IPv4 socket if required */ | |
254 | ||
255 | if (use_ipv4) | |
256 | { | |
257 | if (debug) printf("Creating IPv4 socket\n"); | |
258 | listen_socket[v4n] = socket(AF_INET, SOCK_STREAM, 0); | |
259 | if (listen_socket[v4n] < 0) | |
260 | { | |
261 | printf("IPv4 socket creation failed: %s\n", strerror(errno)); | |
262 | exit(1); | |
263 | } | |
264 | } | |
265 | } | |
266 | ||
267 | ||
268 | /* Set SO_REUSEADDR on the IP sockets so that the program can be restarted | |
269 | while a connection is being handled - this can happen as old connections lie | |
270 | around for a bit while crashed processes are tidied away. Without this, a | |
271 | connection will prevent reuse of the smtp port for listening. */ | |
272 | ||
273 | for (i = v6n; i <= v4n; i++) | |
274 | { | |
275 | if (listen_socket[i] >= 0 && | |
276 | setsockopt(listen_socket[i], SOL_SOCKET, SO_REUSEADDR, (char *)(&on), | |
277 | sizeof(on)) < 0) | |
278 | { | |
279 | printf("setting SO_REUSEADDR on socket failed: %s\n", strerror(errno)); | |
280 | exit(1); | |
281 | } | |
282 | } | |
283 | ||
284 | ||
285 | /* Now bind the sockets to the required port or path. If a path, ensure | |
286 | anyone can write to it. */ | |
287 | ||
288 | if (port == 0) | |
289 | { | |
290 | struct stat statbuf; | |
291 | sockun.sun_family = AF_UNIX; | |
292 | if (debug) printf("Binding Unix domain socket\n"); | |
293 | sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), sockname); | |
294 | if (bind(listen_socket[udn], (struct sockaddr *)&sockun, sizeof(sockun)) < 0) | |
295 | { | |
296 | printf("Unix domain socket bind() failed: %s\n", strerror(errno)); | |
297 | exit(1); | |
298 | } | |
299 | (void)stat(sockname, &statbuf); | |
300 | if (debug) printf("Setting Unix domain socket mode: %0x\n", | |
301 | statbuf.st_mode | 0777); | |
302 | if (chmod(sockname, statbuf.st_mode | 0777) < 0) | |
303 | { | |
304 | printf("Unix domain socket chmod() failed: %s\n", strerror(errno)); | |
305 | exit(1); | |
306 | } | |
307 | } | |
308 | ||
309 | else | |
310 | { | |
311 | for (i = 0; i < skn; i++) | |
312 | { | |
313 | if (listen_socket[i] < 0) continue; | |
314 | ||
315 | /* For an IPv6 listen, use an IPv6 socket */ | |
316 | ||
317 | #if HAVE_IPV6 | |
318 | if (i == v6n) | |
319 | { | |
320 | memset(&sin6, 0, sizeof(sin6)); | |
321 | sin6.sin6_family = AF_INET6; | |
322 | sin6.sin6_port = htons(port); | |
323 | sin6.sin6_addr = anyaddr6; | |
324 | if (bind(listen_socket[i], (struct sockaddr *)&sin6, sizeof(sin6)) < 0) | |
325 | { | |
326 | printf("IPv6 socket bind() failed: %s\n", strerror(errno)); | |
327 | exit(1); | |
328 | } | |
329 | } | |
330 | else | |
331 | #endif | |
332 | ||
333 | /* For an IPv4 bind, use an IPv4 socket, even in an IPv6 world. If an IPv4 | |
334 | bind fails EADDRINUSE after IPv6 success, carry on, because it means the | |
335 | IPv6 socket will handle IPv4 connections. */ | |
336 | ||
337 | { | |
338 | memset(&sin4, 0, sizeof(sin4)); | |
339 | sin4.sin_family = AF_INET; | |
340 | sin4.sin_addr.s_addr = (S_ADDR_TYPE)INADDR_ANY; | |
341 | sin4.sin_port = htons(port); | |
342 | if (bind(listen_socket[i], (struct sockaddr *)&sin4, sizeof(sin4)) < 0) | |
343 | { | |
344 | if (listen_socket[v6n] < 0 || errno != EADDRINUSE) | |
345 | { | |
346 | printf("IPv4 socket bind() failed: %s\n", strerror(errno)); | |
347 | exit(1); | |
348 | } | |
349 | else | |
350 | { | |
351 | close(listen_socket[i]); | |
352 | listen_socket[i] = -1; | |
353 | } | |
354 | } | |
355 | } | |
356 | } | |
357 | } | |
358 | ||
359 | ||
360 | /* Start listening. If IPv4 fails EADDRINUSE after IPv6 succeeds, ignore the | |
361 | error because it means that the IPv6 socket will handle IPv4 connections. Don't | |
362 | output anything, because it will mess up the test output, which will be | |
363 | different for systems that do this and those that don't. */ | |
364 | ||
365 | for (i = 0; i <= skn; i++) | |
366 | { | |
367 | if (listen_socket[i] >= 0 && listen(listen_socket[i], 5) < 0) | |
368 | { | |
369 | if (i != v4n || listen_socket[v6n] < 0 || errno != EADDRINUSE) | |
370 | { | |
371 | printf("listen() failed: %s\n", strerror(errno)); | |
372 | exit(1); | |
373 | } | |
374 | } | |
375 | } | |
376 | ||
377 | ||
378 | /* This program handles only a fixed number of connections, in sequence. Before | |
379 | waiting for the first connection, read the standard input, which contains the | |
380 | script of things to do. A line containing "++++" is treated as end of file. | |
381 | This is so that the Perl driving script doesn't have to close the pipe - | |
382 | because that would cause it to wait for this process, which it doesn't yet want | |
383 | to do. The driving script adds the "++++" automatically - it doesn't actually | |
384 | appear in the test script. */ | |
385 | ||
a719fce4 | 386 | while (fgets(CS buffer, sizeof(buffer), stdin) != NULL) |
c55a77db PH |
387 | { |
388 | line *next; | |
a719fce4 | 389 | int n = (int)strlen(CS buffer); |
c55a77db PH |
390 | while (n > 0 && isspace(buffer[n-1])) n--; |
391 | buffer[n] = 0; | |
a719fce4 | 392 | if (strcmp(CS buffer, "++++") == 0) break; |
c55a77db PH |
393 | next = malloc(sizeof(line) + n); |
394 | next->next = NULL; | |
a719fce4 | 395 | strcpy(next->line, CS buffer); |
c55a77db PH |
396 | if (last == NULL) script = last = next; |
397 | else last->next = next; | |
398 | last = next; | |
399 | } | |
400 | ||
401 | fclose(stdin); | |
402 | ||
403 | /* SIGALRM handler crashes out */ | |
404 | ||
405 | signal(SIGALRM, sigalrm_handler); | |
406 | ||
407 | /* s points to the current place in the script */ | |
408 | ||
409 | s = script; | |
410 | ||
411 | for (count = 0; count < connection_count; count++) | |
412 | { | |
413 | alarm(timeout); | |
414 | if (port <= 0) | |
415 | { | |
416 | printf("Listening on %s ... ", sockname); | |
417 | fflush(stdout); | |
418 | accept_socket = accept(listen_socket[udn], | |
419 | (struct sockaddr *)&sockun_accepted, &sockun_len); | |
420 | } | |
421 | ||
422 | else | |
423 | { | |
424 | int lcount; | |
425 | int max_socket = 0; | |
426 | fd_set select_listen; | |
427 | ||
428 | printf("Listening on port %d ... ", port); | |
429 | fflush(stdout); | |
430 | ||
431 | FD_ZERO(&select_listen); | |
432 | for (i = 0; i < skn; i++) | |
433 | { | |
434 | if (listen_socket[i] >= 0) FD_SET(listen_socket[i], &select_listen); | |
435 | if (listen_socket[i] > max_socket) max_socket = listen_socket[i]; | |
436 | } | |
437 | ||
438 | lcount = select(max_socket + 1, &select_listen, NULL, NULL, NULL); | |
439 | if (lcount < 0) | |
440 | { | |
441 | printf("Select failed\n"); | |
442 | fflush(stdout); | |
443 | continue; | |
444 | } | |
445 | ||
446 | accept_socket = -1; | |
447 | for (i = 0; i < skn; i++) | |
448 | { | |
449 | if (listen_socket[i] > 0 && FD_ISSET(listen_socket[i], &select_listen)) | |
450 | { | |
451 | accept_socket = accept(listen_socket[i], | |
452 | (struct sockaddr *)&accepted, &len); | |
453 | FD_CLR(listen_socket[i], &select_listen); | |
454 | break; | |
455 | } | |
456 | } | |
457 | } | |
458 | alarm(0); | |
459 | ||
460 | if (accept_socket < 0) | |
461 | { | |
462 | printf("accept() failed: %s\n", strerror(errno)); | |
463 | exit(1); | |
464 | } | |
465 | ||
466 | out = fdopen(accept_socket, "w"); | |
467 | ||
468 | dup_accept_socket = dup(accept_socket); | |
469 | ||
470 | if (port > 0) | |
a719fce4 | 471 | printf("\nConnection request from [%s]\n", host_ntoa(&accepted, CS buffer)); |
c55a77db PH |
472 | else |
473 | { | |
474 | printf("\nConnection request\n"); | |
475 | ||
476 | /* Linux supports a feature for acquiring the peer's credentials, but it | |
477 | appears to be Linux-specific. This code is untested and unused, just | |
478 | saved here for reference. */ | |
479 | ||
480 | /**********-------------------- | |
481 | struct ucred cr; | |
482 | int cl=sizeof(cr); | |
483 | ||
484 | if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &cl)==0) { | |
485 | printf("Peer's pid=%d, uid=%d, gid=%d\n", | |
486 | cr.pid, cr.uid, cr.gid); | |
487 | --------------*****************/ | |
488 | } | |
489 | ||
490 | if (dup_accept_socket < 0) | |
491 | { | |
492 | printf("Couldn't dup socket descriptor\n"); | |
493 | printf("421 Connection refused: %s\n", strerror(errno)); | |
494 | fprintf(out, "421 Connection refused: %s\r\n", strerror(errno)); | |
495 | fclose(out); | |
496 | exit(2); | |
497 | } | |
498 | ||
499 | in = fdopen(dup_accept_socket, "r"); | |
500 | ||
501 | /* Loop for handling the conversation(s). For use in SMTP sessions, there are | |
502 | default rules for determining input and output lines: the latter start with | |
503 | digits. This means that the input looks like SMTP dialog. However, this | |
504 | doesn't work for other tests (e.g. ident tests) so we have explicit '<' and | |
505 | '>' flags for input and output as well as the defaults. */ | |
506 | ||
507 | for (; s != NULL; s = s->next) | |
508 | { | |
509 | char *ss = s->line; | |
510 | ||
511 | /* Output lines either start with '>' or a digit. In the '>' case we can | |
512 | fudge the sending of \r\n as required. Default is \r\n, ">>" send nothing, | |
513 | ">CR>" sends \r only, and ">LF>" sends \n only. We can also force a | |
514 | connection closedown by ">*eof". */ | |
515 | ||
516 | if (ss[0] == '>') | |
517 | { | |
518 | char *end = "\r\n"; | |
519 | printf("%s\n", ss++); | |
520 | ||
521 | if (strncmp(ss, "*eof", 4) == 0) | |
522 | { | |
523 | s = s->next; | |
524 | goto END_OFF; | |
525 | } | |
526 | ||
527 | if (*ss == '>') | |
528 | { end = ""; ss++; } | |
529 | else if (strncmp(ss, "CR>", 3) == 0) | |
530 | { end = "\r"; ss += 3; } | |
531 | else if (strncmp(ss, "LF>", 3) == 0) | |
532 | { end = "\n"; ss += 3; } | |
533 | ||
534 | fprintf(out, "%s%s", ss, end); | |
535 | } | |
536 | ||
537 | else if (isdigit((unsigned char)ss[0])) | |
538 | { | |
539 | printf("%s\n", ss); | |
540 | fprintf(out, "%s\r\n", ss); | |
541 | } | |
542 | ||
543 | /* If the script line starts with "*sleep" we just sleep for a while | |
544 | before continuing. */ | |
545 | ||
546 | else if (strncmp(ss, "*sleep ", 7) == 0) | |
547 | { | |
548 | int sleepfor = atoi(ss+7); | |
549 | printf("%s\n", ss); | |
550 | fflush(out); | |
551 | sleep(sleepfor); | |
552 | } | |
553 | ||
554 | /* Otherwise the script line is the start of an input line we are expecting | |
555 | from the client, or "*eof" indicating we expect the client to close the | |
556 | connection. Read command line or data lines; the latter are indicated | |
557 | by the expected line being just ".". If the line starts with '<', that | |
558 | doesn't form part of the expected input. (This allows for incoming data | |
559 | starting with a digit.) */ | |
560 | ||
561 | else | |
562 | { | |
563 | int offset; | |
564 | int data = strcmp(ss, ".") == 0; | |
565 | ||
566 | if (ss[0] == '<') | |
567 | { | |
568 | buffer[0] = '<'; | |
569 | offset = 1; | |
570 | } | |
571 | else offset = 0; | |
572 | ||
573 | fflush(out); | |
574 | ||
575 | for (;;) | |
576 | { | |
577 | int n; | |
578 | alarm(timeout); | |
a719fce4 | 579 | if (fgets(CS buffer+offset, sizeof(buffer)-offset, in) == NULL) |
c55a77db PH |
580 | { |
581 | printf("%sxpected EOF read from client\n", | |
582 | (strncmp(ss, "*eof", 4) == 0)? "E" : "Une"); | |
583 | s = s->next; | |
584 | goto END_OFF; | |
585 | } | |
586 | alarm(0); | |
a719fce4 | 587 | n = (int)strlen(CS buffer); |
c55a77db PH |
588 | while (n > 0 && isspace(buffer[n-1])) n--; |
589 | buffer[n] = 0; | |
590 | printf("%s\n", buffer); | |
a719fce4 | 591 | if (!data || strcmp(CS buffer, ".") == 0) break; |
c55a77db PH |
592 | } |
593 | ||
a719fce4 | 594 | if (strncmp(ss, CS buffer, (int)strlen(ss)) != 0) |
c55a77db PH |
595 | { |
596 | printf("Comparison failed - bailing out\n"); | |
597 | printf("Expected: %s\n", ss); | |
598 | break; | |
599 | } | |
600 | } | |
601 | } | |
602 | ||
603 | END_OFF: | |
604 | fclose(in); | |
605 | fclose(out); | |
606 | } | |
607 | ||
608 | if (s == NULL) printf("End of script\n"); | |
609 | ||
610 | if (sockname != NULL) unlink(sockname); | |
611 | exit(0); | |
612 | } | |
613 | ||
614 | /* End of server.c */ |