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> | |
0ab63f3d | 29 | #include <netinet/tcp.h> |
c55a77db PH |
30 | |
31 | #ifdef HAVE_NETINET_IP_VAR_H | |
dd7b74e9 | 32 | # include <netinet/ip_var.h> |
c55a77db PH |
33 | #endif |
34 | ||
35 | #include <netdb.h> | |
36 | #include <arpa/inet.h> | |
37 | #include <sys/time.h> | |
38 | #include <sys/resource.h> | |
39 | #include <sys/socket.h> | |
40 | #include <sys/un.h> | |
41 | #include <sys/stat.h> | |
42 | #include <fcntl.h> | |
43 | #include <unistd.h> | |
44 | #include <utime.h> | |
45 | ||
46 | #ifdef AF_INET6 | |
a719fce4 | 47 | # define HAVE_IPV6 1 |
c55a77db PH |
48 | #endif |
49 | ||
50 | #ifndef S_ADDR_TYPE | |
a719fce4 JH |
51 | # define S_ADDR_TYPE u_long |
52 | #endif | |
53 | ||
54 | #ifndef CS | |
55 | # define CS (char *) | |
8cfd0f7b | 56 | # define CCS (const char *) |
c55a77db PH |
57 | #endif |
58 | ||
59 | ||
60 | typedef struct line { | |
61 | struct line *next; | |
7eb6c37c | 62 | unsigned len; |
c55a77db PH |
63 | char line[1]; |
64 | } line; | |
65 | ||
dd7b74e9 JH |
66 | typedef unsigned BOOL; |
67 | #define FALSE 0 | |
68 | #define TRUE 1 | |
69 | ||
c55a77db PH |
70 | |
71 | /************************************************* | |
72 | * SIGALRM handler - crash out * | |
73 | *************************************************/ | |
59eaad2b | 74 | int tmo_noerror = 0; |
c55a77db PH |
75 | |
76 | static void | |
77 | sigalrm_handler(int sig) | |
78 | { | |
79 | sig = sig; /* Keep picky compilers happy */ | |
80 | printf("\nServer timed out\n"); | |
59eaad2b | 81 | exit(tmo_noerror ? 0 : 99); |
c55a77db PH |
82 | } |
83 | ||
84 | ||
85 | /************************************************* | |
86 | * Get textual IP address * | |
87 | *************************************************/ | |
88 | ||
89 | /* This function is copied from Exim */ | |
90 | ||
91 | char * | |
92 | host_ntoa(const void *arg, char *buffer) | |
93 | { | |
94 | char *yield; | |
95 | ||
96 | /* The new world. It is annoying that we have to fish out the address from | |
97 | different places in the block, depending on what kind of address it is. It | |
98 | is also a pain that inet_ntop() returns a const char *, whereas the IPv4 | |
99 | function inet_ntoa() returns just char *, and some picky compilers insist | |
100 | on warning if one assigns a const char * to a char *. Hence the casts. */ | |
101 | ||
102 | #if HAVE_IPV6 | |
103 | char addr_buffer[46]; | |
104 | int family = ((struct sockaddr *)arg)->sa_family; | |
105 | if (family == AF_INET6) | |
106 | { | |
107 | struct sockaddr_in6 *sk = (struct sockaddr_in6 *)arg; | |
108 | yield = (char *)inet_ntop(family, &(sk->sin6_addr), addr_buffer, | |
109 | sizeof(addr_buffer)); | |
110 | } | |
111 | else | |
112 | { | |
113 | struct sockaddr_in *sk = (struct sockaddr_in *)arg; | |
114 | yield = (char *)inet_ntop(family, &(sk->sin_addr), addr_buffer, | |
115 | sizeof(addr_buffer)); | |
116 | } | |
117 | ||
118 | /* If the result is a mapped IPv4 address, show it in V4 format. */ | |
119 | ||
120 | if (strncmp(yield, "::ffff:", 7) == 0) yield += 7; | |
121 | ||
122 | #else /* HAVE_IPV6 */ | |
123 | ||
124 | /* The old world */ | |
125 | ||
126 | yield = inet_ntoa(((struct sockaddr_in *)arg)->sin_addr); | |
127 | #endif | |
128 | ||
129 | strcpy(buffer, yield); | |
130 | return buffer; | |
131 | } | |
132 | ||
133 | ||
7eb6c37c JH |
134 | |
135 | static void | |
136 | printit(char * s, int n) | |
137 | { | |
138 | while(n--) | |
139 | { | |
140 | unsigned char c = *s++; | |
141 | if (c == '\\') | |
142 | printf("\\\\"); | |
143 | else if (c >= ' ' && c <= '~') /* assumes ascii */ | |
144 | putchar(c); | |
145 | else | |
146 | printf("\\x%02x", c); | |
147 | } | |
148 | putchar('\n'); | |
149 | } | |
150 | ||
151 | ||
152 | ||
c55a77db PH |
153 | /************************************************* |
154 | * Main Program * | |
155 | *************************************************/ | |
156 | ||
157 | #define v6n 0 /* IPv6 socket number */ | |
158 | #define v4n 1 /* IPv4 socket number */ | |
159 | #define udn 2 /* Unix domain socket number */ | |
160 | #define skn 2 /* Potential number of sockets */ | |
161 | ||
162 | int main(int argc, char **argv) | |
163 | { | |
164 | int i; | |
165 | int port = 0; | |
166 | int listen_socket[3] = { -1, -1, -1 }; | |
167 | int accept_socket; | |
168 | int dup_accept_socket; | |
169 | int connection_count = 1; | |
170 | int count; | |
171 | int on = 1; | |
172 | int timeout = 5; | |
0ab63f3d | 173 | int initial_pause = 0, tfo = 0; |
c55a77db PH |
174 | int use_ipv4 = 1; |
175 | int use_ipv6 = 1; | |
176 | int debug = 0; | |
177 | int na = 1; | |
178 | line *script = NULL; | |
179 | line *last = NULL; | |
180 | line *s; | |
181 | FILE *in, *out; | |
7eb6c37c | 182 | int linebuf = 1; |
f41e0506 | 183 | char *pidfile = NULL; |
c55a77db PH |
184 | |
185 | char *sockname = NULL; | |
186 | unsigned char buffer[10240]; | |
187 | ||
188 | struct sockaddr_un sockun; /* don't use "sun" */ | |
189 | struct sockaddr_un sockun_accepted; | |
190 | int sockun_len = sizeof(sockun_accepted); | |
191 | ||
192 | #if HAVE_IPV6 | |
193 | struct sockaddr_in6 sin6; | |
194 | struct sockaddr_in6 accepted; | |
195 | struct in6_addr anyaddr6 = IN6ADDR_ANY_INIT ; | |
196 | #else | |
197 | struct sockaddr_in accepted; | |
198 | #endif | |
199 | ||
200 | /* Always need an IPv4 structure */ | |
201 | ||
202 | struct sockaddr_in sin4; | |
203 | ||
204 | int len = sizeof(accepted); | |
205 | ||
206 | ||
207 | /* Sort out the arguments */ | |
e5c9fb3c HSHR |
208 | if (argc > 1 && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h"))) |
209 | { | |
214133f2 | 210 | printf("Usage: %s [options] port|socket [connection count]\n", argv[0]); |
e5c9fb3c HSHR |
211 | puts("Options" |
212 | "\n\t-d debug" | |
213 | "\n\t-i n n seconds initial delay" | |
214 | "\n\t-noipv4 disable ipv4" | |
215 | "\n\t-noipv6 disable ipv6" | |
216 | "\n\t-oP file write PID to file" | |
217 | "\n\t-t n n seconds timeout" | |
0ab63f3d | 218 | "\n\t-tfo enable TCP Fast Open" |
e5c9fb3c HSHR |
219 | ); |
220 | exit(0); | |
221 | } | |
c55a77db PH |
222 | |
223 | while (na < argc && argv[na][0] == '-') | |
224 | { | |
225 | if (strcmp(argv[na], "-d") == 0) debug = 1; | |
0ab63f3d | 226 | else if (strcmp(argv[na], "-tfo") == 0) tfo = 1; |
59eaad2b JH |
227 | else if (strcmp(argv[na], "-t") == 0) |
228 | { | |
229 | if (tmo_noerror = ((timeout = atoi(argv[++na])) < 0)) timeout = -timeout; | |
230 | } | |
8a512ed5 | 231 | else if (strcmp(argv[na], "-i") == 0) initial_pause = atoi(argv[++na]); |
c55a77db PH |
232 | else if (strcmp(argv[na], "-noipv4") == 0) use_ipv4 = 0; |
233 | else if (strcmp(argv[na], "-noipv6") == 0) use_ipv6 = 0; | |
f41e0506 | 234 | else if (strcmp(argv[na], "-oP") == 0) pidfile = argv[++na]; |
c55a77db PH |
235 | else |
236 | { | |
e5c9fb3c | 237 | printf("server: unknown option %s, try -h or --help\n", argv[na]); |
c55a77db PH |
238 | exit(1); |
239 | } | |
240 | na++; | |
241 | } | |
242 | ||
243 | if (!use_ipv4 && !use_ipv6) | |
244 | { | |
245 | printf("server: -noipv4 and -noipv6 cannot both be given\n"); | |
246 | exit(1); | |
247 | } | |
248 | ||
249 | if (na >= argc) | |
250 | { | |
251 | printf("server: no port number or socket name given\n"); | |
252 | exit(1); | |
253 | } | |
254 | ||
255 | if (argv[na][0] == '/') | |
256 | { | |
257 | sockname = argv[na]; | |
258 | unlink(sockname); /* in case left lying around */ | |
259 | } | |
260 | else port = atoi(argv[na]); | |
261 | na++; | |
262 | ||
263 | if (na < argc) connection_count = atoi(argv[na]); | |
264 | ||
265 | ||
8a512ed5 JH |
266 | /* Initial pause (before creating listen sockets */ |
267 | if (initial_pause > 0) | |
268 | { | |
269 | if (debug) | |
270 | printf("%d: Inital pause of %d seconds\n", time(NULL), initial_pause); | |
271 | else | |
272 | printf("Inital pause of %d seconds\n", initial_pause); | |
273 | while (initial_pause > 0) | |
274 | initial_pause = sleep(initial_pause); | |
275 | } | |
276 | ||
c55a77db PH |
277 | /* Create sockets */ |
278 | ||
279 | if (port == 0) /* Unix domain */ | |
280 | { | |
8a512ed5 | 281 | if (debug) printf("%d: Creating Unix domain socket\n", time(NULL)); |
c55a77db PH |
282 | listen_socket[udn] = socket(PF_UNIX, SOCK_STREAM, 0); |
283 | if (listen_socket[udn] < 0) | |
284 | { | |
285 | printf("Unix domain socket creation failed: %s\n", strerror(errno)); | |
286 | exit(1); | |
287 | } | |
288 | } | |
289 | else | |
290 | { | |
291 | #if HAVE_IPV6 | |
292 | if (use_ipv6) | |
293 | { | |
294 | if (debug) printf("Creating IPv6 socket\n"); | |
295 | listen_socket[v6n] = socket(AF_INET6, SOCK_STREAM, 0); | |
296 | if (listen_socket[v6n] < 0) | |
297 | { | |
298 | printf("IPv6 socket creation failed: %s\n", strerror(errno)); | |
299 | exit(1); | |
300 | } | |
4043ef1c | 301 | #ifdef TCP_FASTOPEN |
0ab63f3d JH |
302 | if (tfo) |
303 | { | |
304 | int backlog = 5; | |
305 | if (setsockopt(listen_socket[v6n], IPPROTO_TCP, TCP_FASTOPEN, | |
306 | &backlog, sizeof(backlog))) | |
307 | if (debug) printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno)); | |
308 | } | |
4043ef1c | 309 | #endif |
c55a77db PH |
310 | /* If this is an IPv6 wildcard socket, set IPV6_V6ONLY if that option is |
311 | available. */ | |
312 | ||
313 | #ifdef IPV6_V6ONLY | |
314 | if (setsockopt(listen_socket[v6n], IPPROTO_IPV6, IPV6_V6ONLY, (char *)(&on), | |
315 | sizeof(on)) < 0) | |
316 | printf("Setting IPV6_V6ONLY on IPv6 wildcard " | |
317 | "socket failed (%s): carrying on without it\n", strerror(errno)); | |
318 | #endif /* IPV6_V6ONLY */ | |
319 | } | |
320 | #endif /* HAVE_IPV6 */ | |
321 | ||
322 | /* Create an IPv4 socket if required */ | |
323 | ||
324 | if (use_ipv4) | |
325 | { | |
326 | if (debug) printf("Creating IPv4 socket\n"); | |
327 | listen_socket[v4n] = socket(AF_INET, SOCK_STREAM, 0); | |
328 | if (listen_socket[v4n] < 0) | |
329 | { | |
330 | printf("IPv4 socket creation failed: %s\n", strerror(errno)); | |
331 | exit(1); | |
332 | } | |
4043ef1c | 333 | #ifdef TCP_FASTOPEN |
0ab63f3d JH |
334 | if (tfo) |
335 | { | |
336 | int backlog = 5; | |
337 | if (setsockopt(listen_socket[v4n], IPPROTO_TCP, TCP_FASTOPEN, | |
338 | &backlog, sizeof(backlog))) | |
339 | if (debug) printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno)); | |
340 | } | |
4043ef1c | 341 | #endif |
c55a77db PH |
342 | } |
343 | } | |
344 | ||
345 | ||
346 | /* Set SO_REUSEADDR on the IP sockets so that the program can be restarted | |
347 | while a connection is being handled - this can happen as old connections lie | |
348 | around for a bit while crashed processes are tidied away. Without this, a | |
349 | connection will prevent reuse of the smtp port for listening. */ | |
350 | ||
351 | for (i = v6n; i <= v4n; i++) | |
352 | { | |
353 | if (listen_socket[i] >= 0 && | |
354 | setsockopt(listen_socket[i], SOL_SOCKET, SO_REUSEADDR, (char *)(&on), | |
355 | sizeof(on)) < 0) | |
356 | { | |
357 | printf("setting SO_REUSEADDR on socket failed: %s\n", strerror(errno)); | |
358 | exit(1); | |
359 | } | |
360 | } | |
361 | ||
362 | ||
363 | /* Now bind the sockets to the required port or path. If a path, ensure | |
364 | anyone can write to it. */ | |
365 | ||
366 | if (port == 0) | |
367 | { | |
368 | struct stat statbuf; | |
369 | sockun.sun_family = AF_UNIX; | |
370 | if (debug) printf("Binding Unix domain socket\n"); | |
371 | sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), sockname); | |
372 | if (bind(listen_socket[udn], (struct sockaddr *)&sockun, sizeof(sockun)) < 0) | |
373 | { | |
374 | printf("Unix domain socket bind() failed: %s\n", strerror(errno)); | |
375 | exit(1); | |
376 | } | |
377 | (void)stat(sockname, &statbuf); | |
378 | if (debug) printf("Setting Unix domain socket mode: %0x\n", | |
379 | statbuf.st_mode | 0777); | |
380 | if (chmod(sockname, statbuf.st_mode | 0777) < 0) | |
381 | { | |
382 | printf("Unix domain socket chmod() failed: %s\n", strerror(errno)); | |
383 | exit(1); | |
384 | } | |
385 | } | |
386 | ||
387 | else | |
388 | { | |
389 | for (i = 0; i < skn; i++) | |
390 | { | |
391 | if (listen_socket[i] < 0) continue; | |
392 | ||
393 | /* For an IPv6 listen, use an IPv6 socket */ | |
394 | ||
395 | #if HAVE_IPV6 | |
396 | if (i == v6n) | |
397 | { | |
398 | memset(&sin6, 0, sizeof(sin6)); | |
399 | sin6.sin6_family = AF_INET6; | |
400 | sin6.sin6_port = htons(port); | |
401 | sin6.sin6_addr = anyaddr6; | |
402 | if (bind(listen_socket[i], (struct sockaddr *)&sin6, sizeof(sin6)) < 0) | |
403 | { | |
6678a497 | 404 | printf("IPv6 socket bind(port %d) failed: %s\n", port, strerror(errno)); |
c55a77db PH |
405 | exit(1); |
406 | } | |
407 | } | |
408 | else | |
409 | #endif | |
410 | ||
411 | /* For an IPv4 bind, use an IPv4 socket, even in an IPv6 world. If an IPv4 | |
412 | bind fails EADDRINUSE after IPv6 success, carry on, because it means the | |
413 | IPv6 socket will handle IPv4 connections. */ | |
414 | ||
415 | { | |
416 | memset(&sin4, 0, sizeof(sin4)); | |
417 | sin4.sin_family = AF_INET; | |
418 | sin4.sin_addr.s_addr = (S_ADDR_TYPE)INADDR_ANY; | |
419 | sin4.sin_port = htons(port); | |
420 | if (bind(listen_socket[i], (struct sockaddr *)&sin4, sizeof(sin4)) < 0) | |
c55a77db PH |
421 | if (listen_socket[v6n] < 0 || errno != EADDRINUSE) |
422 | { | |
6678a497 | 423 | printf("IPv4 socket bind(port %d) failed: %s\n", port, strerror(errno)); |
c55a77db PH |
424 | exit(1); |
425 | } | |
426 | else | |
427 | { | |
428 | close(listen_socket[i]); | |
429 | listen_socket[i] = -1; | |
430 | } | |
c55a77db PH |
431 | } |
432 | } | |
433 | } | |
434 | ||
435 | ||
436 | /* Start listening. If IPv4 fails EADDRINUSE after IPv6 succeeds, ignore the | |
437 | error because it means that the IPv6 socket will handle IPv4 connections. Don't | |
438 | output anything, because it will mess up the test output, which will be | |
439 | different for systems that do this and those that don't. */ | |
440 | ||
441 | for (i = 0; i <= skn; i++) | |
442 | { | |
443 | if (listen_socket[i] >= 0 && listen(listen_socket[i], 5) < 0) | |
444 | { | |
445 | if (i != v4n || listen_socket[v6n] < 0 || errno != EADDRINUSE) | |
446 | { | |
447 | printf("listen() failed: %s\n", strerror(errno)); | |
448 | exit(1); | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
453 | ||
f41e0506 JH |
454 | if (pidfile) |
455 | { | |
456 | FILE * p; | |
457 | if (!(p = fopen(pidfile, "w"))) | |
458 | { | |
459 | fprintf(stderr, "pidfile create failed: %s\n", strerror(errno)); | |
460 | exit(1); | |
461 | } | |
462 | fprintf(p, "%ld\n", (long)getpid()); | |
463 | fclose(p); | |
464 | } | |
465 | ||
c55a77db PH |
466 | /* This program handles only a fixed number of connections, in sequence. Before |
467 | waiting for the first connection, read the standard input, which contains the | |
468 | script of things to do. A line containing "++++" is treated as end of file. | |
469 | This is so that the Perl driving script doesn't have to close the pipe - | |
470 | because that would cause it to wait for this process, which it doesn't yet want | |
471 | to do. The driving script adds the "++++" automatically - it doesn't actually | |
7eb6c37c | 472 | appear in the test script. Within lines we interpret \xNN and \\ groups */ |
c55a77db | 473 | |
a719fce4 | 474 | while (fgets(CS buffer, sizeof(buffer), stdin) != NULL) |
c55a77db PH |
475 | { |
476 | line *next; | |
7eb6c37c | 477 | char * d; |
a719fce4 | 478 | int n = (int)strlen(CS buffer); |
7eb6c37c JH |
479 | |
480 | if (n > 1 && buffer[0] == '>' && buffer[1] == '>') | |
481 | linebuf = 0; | |
c55a77db PH |
482 | while (n > 0 && isspace(buffer[n-1])) n--; |
483 | buffer[n] = 0; | |
a719fce4 | 484 | if (strcmp(CS buffer, "++++") == 0) break; |
c55a77db PH |
485 | next = malloc(sizeof(line) + n); |
486 | next->next = NULL; | |
7eb6c37c JH |
487 | d = next->line; |
488 | { | |
489 | char * s = CS buffer; | |
490 | do | |
491 | { | |
492 | char ch; | |
493 | char cl = *s; | |
494 | if (cl == '\\' && (cl = *++s) == 'x') | |
495 | { | |
496 | if ((ch = *++s - '0') > 9 && (ch -= 'A'-'9'-1) > 15) ch -= 'a'-'A'; | |
497 | if ((cl = *++s - '0') > 9 && (cl -= 'A'-'9'-1) > 15) cl -= 'a'-'A'; | |
498 | cl |= ch << 4; | |
499 | } | |
500 | *d++ = cl; | |
501 | } | |
502 | while (*s++); | |
503 | } | |
504 | next->len = d - next->line - 1; | |
c55a77db PH |
505 | if (last == NULL) script = last = next; |
506 | else last->next = next; | |
507 | last = next; | |
508 | } | |
509 | ||
510 | fclose(stdin); | |
511 | ||
512 | /* SIGALRM handler crashes out */ | |
513 | ||
514 | signal(SIGALRM, sigalrm_handler); | |
515 | ||
516 | /* s points to the current place in the script */ | |
517 | ||
518 | s = script; | |
519 | ||
520 | for (count = 0; count < connection_count; count++) | |
521 | { | |
522 | alarm(timeout); | |
523 | if (port <= 0) | |
524 | { | |
525 | printf("Listening on %s ... ", sockname); | |
526 | fflush(stdout); | |
527 | accept_socket = accept(listen_socket[udn], | |
528 | (struct sockaddr *)&sockun_accepted, &sockun_len); | |
529 | } | |
530 | ||
531 | else | |
532 | { | |
533 | int lcount; | |
534 | int max_socket = 0; | |
535 | fd_set select_listen; | |
536 | ||
537 | printf("Listening on port %d ... ", port); | |
538 | fflush(stdout); | |
539 | ||
540 | FD_ZERO(&select_listen); | |
541 | for (i = 0; i < skn; i++) | |
542 | { | |
543 | if (listen_socket[i] >= 0) FD_SET(listen_socket[i], &select_listen); | |
544 | if (listen_socket[i] > max_socket) max_socket = listen_socket[i]; | |
545 | } | |
546 | ||
dd7b74e9 | 547 | if ((lcount = select(max_socket + 1, &select_listen, NULL, NULL, NULL)) < 0) |
c55a77db PH |
548 | { |
549 | printf("Select failed\n"); | |
550 | fflush(stdout); | |
551 | continue; | |
552 | } | |
553 | ||
554 | accept_socket = -1; | |
555 | for (i = 0; i < skn; i++) | |
c55a77db PH |
556 | if (listen_socket[i] > 0 && FD_ISSET(listen_socket[i], &select_listen)) |
557 | { | |
558 | accept_socket = accept(listen_socket[i], | |
559 | (struct sockaddr *)&accepted, &len); | |
560 | FD_CLR(listen_socket[i], &select_listen); | |
561 | break; | |
562 | } | |
c55a77db PH |
563 | } |
564 | alarm(0); | |
565 | ||
566 | if (accept_socket < 0) | |
567 | { | |
568 | printf("accept() failed: %s\n", strerror(errno)); | |
569 | exit(1); | |
570 | } | |
571 | ||
572 | out = fdopen(accept_socket, "w"); | |
573 | ||
574 | dup_accept_socket = dup(accept_socket); | |
575 | ||
576 | if (port > 0) | |
a719fce4 | 577 | printf("\nConnection request from [%s]\n", host_ntoa(&accepted, CS buffer)); |
c55a77db PH |
578 | else |
579 | { | |
580 | printf("\nConnection request\n"); | |
581 | ||
582 | /* Linux supports a feature for acquiring the peer's credentials, but it | |
583 | appears to be Linux-specific. This code is untested and unused, just | |
584 | saved here for reference. */ | |
585 | ||
586 | /**********-------------------- | |
587 | struct ucred cr; | |
588 | int cl=sizeof(cr); | |
589 | ||
590 | if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &cl)==0) { | |
591 | printf("Peer's pid=%d, uid=%d, gid=%d\n", | |
592 | cr.pid, cr.uid, cr.gid); | |
593 | --------------*****************/ | |
594 | } | |
b9d9c5a2 | 595 | fflush(stdout); |
c55a77db PH |
596 | |
597 | if (dup_accept_socket < 0) | |
598 | { | |
599 | printf("Couldn't dup socket descriptor\n"); | |
600 | printf("421 Connection refused: %s\n", strerror(errno)); | |
601 | fprintf(out, "421 Connection refused: %s\r\n", strerror(errno)); | |
602 | fclose(out); | |
603 | exit(2); | |
604 | } | |
605 | ||
606 | in = fdopen(dup_accept_socket, "r"); | |
607 | ||
608 | /* Loop for handling the conversation(s). For use in SMTP sessions, there are | |
609 | default rules for determining input and output lines: the latter start with | |
610 | digits. This means that the input looks like SMTP dialog. However, this | |
611 | doesn't work for other tests (e.g. ident tests) so we have explicit '<' and | |
612 | '>' flags for input and output as well as the defaults. */ | |
613 | ||
dd7b74e9 | 614 | for (; s; s = s->next) |
c55a77db PH |
615 | { |
616 | char *ss = s->line; | |
617 | ||
618 | /* Output lines either start with '>' or a digit. In the '>' case we can | |
619 | fudge the sending of \r\n as required. Default is \r\n, ">>" send nothing, | |
620 | ">CR>" sends \r only, and ">LF>" sends \n only. We can also force a | |
621 | connection closedown by ">*eof". */ | |
622 | ||
623 | if (ss[0] == '>') | |
624 | { | |
625 | char *end = "\r\n"; | |
7eb6c37c JH |
626 | unsigned len = s->len; |
627 | printit(ss++, len--); | |
c55a77db PH |
628 | |
629 | if (strncmp(ss, "*eof", 4) == 0) | |
630 | { | |
631 | s = s->next; | |
632 | goto END_OFF; | |
633 | } | |
634 | ||
635 | if (*ss == '>') | |
7eb6c37c | 636 | { end = ""; ss++; len--; } |
c55a77db | 637 | else if (strncmp(ss, "CR>", 3) == 0) |
7eb6c37c | 638 | { end = "\r"; ss += 3; len -= 3; } |
c55a77db | 639 | else if (strncmp(ss, "LF>", 3) == 0) |
7eb6c37c | 640 | { end = "\n"; ss += 3; len -= 3; } |
c55a77db | 641 | |
7eb6c37c JH |
642 | fwrite(ss, 1, len, out); |
643 | if (*end) fprintf(out, end); | |
c55a77db PH |
644 | } |
645 | ||
646 | else if (isdigit((unsigned char)ss[0])) | |
647 | { | |
648 | printf("%s\n", ss); | |
649 | fprintf(out, "%s\r\n", ss); | |
650 | } | |
651 | ||
652 | /* If the script line starts with "*sleep" we just sleep for a while | |
653 | before continuing. */ | |
654 | ||
655 | else if (strncmp(ss, "*sleep ", 7) == 0) | |
656 | { | |
657 | int sleepfor = atoi(ss+7); | |
658 | printf("%s\n", ss); | |
659 | fflush(out); | |
660 | sleep(sleepfor); | |
661 | } | |
662 | ||
e027f545 JH |
663 | /* If the script line starts with "*data " we expect a numeric argument, |
664 | and we expect to read (and discard) that many data bytes from the input. */ | |
665 | ||
666 | else if (strncmp(ss, "*data ", 6) == 0) | |
667 | { | |
668 | int dlen = atoi(ss+6); | |
669 | int n; | |
670 | ||
671 | alarm(timeout); | |
672 | ||
673 | if (!linebuf) | |
674 | while (dlen > 0) | |
675 | { | |
676 | n = dlen < sizeof(buffer) ? dlen : sizeof(buffer); | |
677 | if ((n = read(dup_accept_socket, CS buffer, n)) == 0) | |
678 | { | |
4c04137d | 679 | printf("Unexpected EOF read from client\n"); |
e027f545 JH |
680 | s = s->next; |
681 | goto END_OFF; | |
682 | } | |
683 | dlen -= n; | |
684 | } | |
685 | else | |
686 | while (dlen-- > 0) | |
687 | if (fgetc(in) == EOF) | |
688 | { | |
4c04137d | 689 | printf("Unexpected EOF read from client\n"); |
e027f545 JH |
690 | s = s->next; |
691 | goto END_OFF; | |
692 | } | |
693 | } | |
694 | ||
c55a77db PH |
695 | /* Otherwise the script line is the start of an input line we are expecting |
696 | from the client, or "*eof" indicating we expect the client to close the | |
697 | connection. Read command line or data lines; the latter are indicated | |
698 | by the expected line being just ".". If the line starts with '<', that | |
699 | doesn't form part of the expected input. (This allows for incoming data | |
7eb6c37c JH |
700 | starting with a digit.) If the line starts with '<<' we operate in |
701 | unbuffered rather than line mode and assume that a single read gets the | |
702 | entire message. */ | |
c55a77db PH |
703 | |
704 | else | |
705 | { | |
706 | int offset; | |
707 | int data = strcmp(ss, ".") == 0; | |
708 | ||
7eb6c37c JH |
709 | if (ss[0] != '<') |
710 | offset = 0; | |
711 | else | |
c55a77db PH |
712 | { |
713 | buffer[0] = '<'; | |
7eb6c37c JH |
714 | if (ss[1] != '<') |
715 | offset = 1; | |
716 | else | |
717 | { | |
718 | buffer[1] = '<'; | |
719 | offset = 2; | |
720 | } | |
c55a77db | 721 | } |
c55a77db PH |
722 | |
723 | fflush(out); | |
724 | ||
7eb6c37c JH |
725 | if (!linebuf) |
726 | { | |
727 | int n; | |
728 | char c; | |
729 | ||
730 | alarm(timeout); | |
731 | n = read(dup_accept_socket, CS buffer+offset, s->len - offset); | |
732 | if (n == 0) | |
733 | { | |
734 | printf("%sxpected EOF read from client\n", | |
735 | (strncmp(ss, "*eof", 4) == 0)? "E" : "Une"); | |
736 | s = s->next; | |
737 | goto END_OFF; | |
738 | } | |
739 | if (offset != 2) | |
740 | while (read(dup_accept_socket, &c, 1) == 1 && c != '\n') ; | |
741 | alarm(0); | |
742 | n += offset; | |
743 | ||
8cfd0f7b | 744 | printit(CS buffer, n); |
7eb6c37c JH |
745 | |
746 | if (data) do | |
747 | { | |
748 | n = (read(dup_accept_socket, &c, 1) == 1 && c == '.'); | |
749 | while (c != '\n' && read(dup_accept_socket, &c, 1) == 1) | |
e443f672 | 750 | ; |
7eb6c37c JH |
751 | } while (!n); |
752 | else if (memcmp(ss, buffer, n) != 0) | |
753 | { | |
754 | printf("Comparison failed - bailing out\nExpected: "); | |
755 | printit(ss, n); | |
756 | break; | |
757 | } | |
758 | } | |
759 | else | |
760 | { | |
761 | for (;;) | |
762 | { | |
763 | int n; | |
764 | alarm(timeout); | |
765 | if (fgets(CS buffer+offset, sizeof(buffer)-offset, in) == NULL) | |
766 | { | |
767 | printf("%sxpected EOF read from client\n", | |
768 | (strncmp(ss, "*eof", 4) == 0)? "E" : "Une"); | |
769 | s = s->next; | |
770 | goto END_OFF; | |
771 | } | |
772 | alarm(0); | |
e443f672 | 773 | n = (int)strlen(CS buffer); |
7eb6c37c JH |
774 | while (n > 0 && isspace(buffer[n-1])) n--; |
775 | buffer[n] = 0; | |
776 | printf("%s\n", buffer); | |
777 | if (!data || strcmp(CS buffer, ".") == 0) break; | |
778 | } | |
779 | ||
780 | if (strncmp(ss, CS buffer, (int)strlen(ss)) != 0) | |
781 | { | |
782 | printf("Comparison failed - bailing out\n"); | |
783 | printf("Expected: %s\n", ss); | |
784 | break; | |
785 | } | |
786 | } | |
c55a77db PH |
787 | } |
788 | } | |
789 | ||
790 | END_OFF: | |
791 | fclose(in); | |
792 | fclose(out); | |
793 | } | |
794 | ||
795 | if (s == NULL) printf("End of script\n"); | |
796 | ||
dd7b74e9 | 797 | if (sockname) unlink(sockname); |
c55a77db PH |
798 | exit(0); |
799 | } | |
800 | ||
801 | /* End of server.c */ |