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Files: b108809a78dbedce34bf8dee060fd4a2e72480c8 / sslh-main.c

18131 bytesRaw

1 /*
2 # main: processing of config file, command line options and start the main
3 # loop.
4 #
5 # Copyright (C) 2007-2014  Yves Rutschle
6 # 
7 # This program is free software; you can redistribute it
8 # and/or modify it under the terms of the GNU General Public
9 # License as published by the Free Software Foundation; either
10 # version 2 of the License, or (at your option) any later
11 # version.
12 # 
13 # This program is distributed in the hope that it will be
14 # useful, but WITHOUT ANY WARRANTY; without even the implied
15 # warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
16 # PURPOSE.  See the GNU General Public License for more
17 # details.
18 # 
19 # The full text for the General Public License is here:
20 # http://www.gnu.org/licenses/gpl.html
21 
22 */
23 
24 #define _GNU_SOURCE
25 #ifdef LIBCONFIG
26 #include <libconfig.h>
27 #endif
28 #ifdef LIBPCRE
29 #include <regex.h>
30 #endif
31 
32 #include "common.h"
33 #include "probe.h"
34 
35 const char* USAGE_STRING =
36 "sslh " VERSION "\n" \
37 "usage:\n" \
38 "\tsslh  [-v] [-i] [-V] [-f] [-n] [--transparent] [-F <file>]\n"
39 "\t[-t <timeout>] [-P <pidfile>] -u <username> -p <add> [-p <addr> ...] \n" \
40 "%s\n\n" /* Dynamically built list of builtin protocols */  \
41 "\t[--on-timeout <addr>]\n" \
42 "-v: verbose\n" \
43 "-V: version\n" \
44 "-f: foreground\n" \
45 "-n: numeric output\n" \
46 "-u: specify under which user to run\n" \
47 "--transparent: behave as a transparent proxy\n" \
48 "-F: use configuration file\n" \
49 "--on-timeout: connect to specified address upon timeout (default: ssh address)\n" \
50 "-t: seconds to wait before connecting to --on-timeout address.\n" \
51 "-p: address and port to listen on.\n    Can be used several times to bind to several addresses.\n" \
52 "--[ssh,ssl,...]: where to connect connections from corresponding protocol.\n" \
53 "-P: PID file.\n" \
54 "-i: Run as a inetd service.\n" \
55 "";
56 
57 /* Constants for options that have no one-character shorthand */
58 #define OPT_ONTIMEOUT   257
59 
60 static struct option const_options[] = {
61     { "inetd",      no_argument,            &inetd,         1 },
62     { "foreground", no_argument,            &foreground,    1 },
63     { "background", no_argument,            &background,    1 },
64     { "transparent", no_argument,           &transparent,   1 },
65     { "numeric",    no_argument,            &numeric,       1 },
66     { "verbose",    no_argument,            &verbose,       1 },
67     { "user",       required_argument,      0,              'u' },
68     { "config",     optional_argument,      0,              'F' },
69     { "pidfile",    required_argument,      0,              'P' },
70     { "timeout",    required_argument,      0,              't' },
71     { "on-timeout", required_argument,      0,              OPT_ONTIMEOUT },
72     { "listen",     required_argument,      0,              'p' },
73     {}
74 };
75 static struct option* all_options;
76 static struct proto* builtins;
77 static const char *optstr = "vt:T:p:VP:F::";
78 
79 
80 
81 static void print_usage(void)
82 {
83     struct proto *p;
84     int i;
85     int res;
86     char *prots = "";
87 
88     p = get_builtins();
89     for (i = 0; i < get_num_builtins(); i++) {
90         res = asprintf(&prots, "%s\t[--%s <addr>]\n", prots, p[i].description);
91         CHECK_RES_DIE(res, "asprintf");
92     }
93 
94     fprintf(stderr, USAGE_STRING, prots);
95 }
96 
97 static void printcaps(void) {
98 #ifdef LIBCAP
99     cap_t caps;
100     char* desc;
101     ssize_t len;
102 
103     caps = cap_get_proc();
104 
105     desc = cap_to_text(caps, &len);
106 
107     fprintf(stderr, "capabilities: %s\n", desc);
108 
109     cap_free(caps);
110     cap_free(desc);
111 #endif
112 }
113 
114 static void printsettings(void)
115 {
116     char buf[NI_MAXHOST];
117     struct addrinfo *a;
118     struct proto *p;
119     
120     for (p = get_first_protocol(); p; p = p->next) {
121         fprintf(stderr,
122                 "%s addr: %s. libwrap service: %s family %d %d\n", 
123                 p->description, 
124                 sprintaddr(buf, sizeof(buf), p->saddr), 
125                 p->service,
126                 p->saddr->ai_family,
127                 p->saddr->ai_addr->sa_family);
128     }
129     fprintf(stderr, "listening on:\n");
130     for (a = addr_listen; a; a = a->ai_next) {
131         fprintf(stderr, "\t%s\n", sprintaddr(buf, sizeof(buf), a));
132     }
133     fprintf(stderr, "timeout: %d\non-timeout: %s\n", probing_timeout,
134             timeout_protocol()->description);
135 }
136 
137 
138 /* Extract configuration on addresses and ports on which to listen.
139  * out: newly allocated list of addrinfo to listen to
140  */
141 #ifdef LIBCONFIG
142 static int config_listen(config_t *config, struct addrinfo **listen) 
143 {
144     config_setting_t *setting, *addr;
145     int len, i;
146     const char *hostname, *port;
147 
148     setting = config_lookup(config, "listen");
149     if (setting) {
150         len = config_setting_length(setting);
151         for (i = 0; i < len; i++) {
152             addr = config_setting_get_elem(setting, i);
153             if (! (config_setting_lookup_string(addr, "host", &hostname) &&
154                    config_setting_lookup_string(addr, "port", &port))) {
155                 fprintf(stderr,
156                             "line %d:Incomplete specification (hostname and port required)\n",
157                             config_setting_source_line(addr));
158                 return -1;
159             }
160 
161             resolve_split_name(listen, hostname, port);
162 
163             /* getaddrinfo returned a list of addresses corresponding to the
164              * specification; move the pointer to the end of that list before
165              * processing the next specification */
166             for (; *listen; listen = &((*listen)->ai_next));
167         }
168     }
169 
170     return 0;
171 }
172 #endif
173 
174 
175 
176 #ifdef LIBCONFIG
177 static void setup_regex_probe(struct proto *p, config_setting_t* probes)
178 {
179 #ifdef LIBPCRE
180     int num_probes, errsize, i, res;
181     char *err;
182     const char * expr;
183     regex_t** probe_list;
184 
185     num_probes = config_setting_length(probes);
186     if (!num_probes) {
187         fprintf(stderr, "%s: no probes specified\n", p->description);
188         exit(1);
189     }
190 
191     p->probe = get_probe("regex");
192     probe_list = calloc(num_probes + 1, sizeof(*probe_list));
193     p->data = (void*)probe_list;
194 
195     for (i = 0; i < num_probes; i++) {
196         probe_list[i] = malloc(sizeof(*(probe_list[i])));
197         expr = config_setting_get_string_elem(probes, i);
198         res = regcomp(probe_list[i], expr, 0);
199         if (res) {
200             err = malloc(errsize = regerror(res, probe_list[i], NULL, 0));
201             regerror(res, probe_list[i], err, errsize);
202             fprintf(stderr, "%s:%s\n", expr, err);
203             free(err);
204             exit(1);
205         }
206     }
207 #else
208     fprintf(stderr, "line %d: regex probe specified but not compiled in\n", config_setting_source_line(probes));
209     exit(5);
210 #endif
211 }
212 #endif
213 
214 #ifdef LIBCONFIG
215 static void setup_sni_hostnames(struct proto *p, config_setting_t* sni_hostnames)
216 {
217     int num_probes, i, max_server_name_len, server_name_len;
218     const char * sni_hostname;
219     char** sni_hostname_list;
220 
221     num_probes = config_setting_length(sni_hostnames);
222     if (!num_probes) {
223         fprintf(stderr, "%s: no sni_hostnames specified\n", p->description);
224         exit(1);
225     }
226 
227     max_server_name_len = 0;
228     for (i = 0; i < num_probes; i++) {
229         server_name_len = strlen(config_setting_get_string_elem(sni_hostnames, i));
230         if(server_name_len > max_server_name_len)
231             max_server_name_len = server_name_len;
232     }
233 
234     sni_hostname_list = calloc(num_probes + 1, ++max_server_name_len);
235     p->data = (void*)sni_hostname_list;
236 
237     for (i = 0; i < num_probes; i++) {
238         sni_hostname = config_setting_get_string_elem(sni_hostnames, i);
239         sni_hostname_list[i] = malloc(max_server_name_len);
240         strcpy (sni_hostname_list[i], sni_hostname);
241         if(verbose) fprintf(stderr, "sni_hostnames[%d]: %s\n", i, sni_hostname_list[i]);
242     }
243 }
244 #endif
245 
246 /* Extract configuration for protocols to connect to.
247  * out: newly-allocated list of protocols
248  */
249 #ifdef LIBCONFIG
250 static int config_protocols(config_t *config, struct proto **prots)
251 {
252     config_setting_t *setting, *prot, *patterns, *sni_hostnames;
253     const char *hostname, *port, *name;
254     int i, num_prots;
255     struct proto *p, *prev = NULL;
256 
257     setting = config_lookup(config, "protocols");
258     if (setting) {
259         num_prots = config_setting_length(setting);
260         for (i = 0; i < num_prots; i++) {
261             p = calloc(1, sizeof(*p));
262             if (i == 0) *prots = p;
263             if (prev) prev->next = p;
264             prev = p;
265 
266             prot = config_setting_get_elem(setting, i);
267             if ((config_setting_lookup_string(prot, "name", &name) &&
268                  config_setting_lookup_string(prot, "host", &hostname) &&
269                  config_setting_lookup_string(prot, "port", &port)
270                 )) {
271                 p->description = name;
272                 config_setting_lookup_string(prot, "service", &(p->service));
273 
274                 resolve_split_name(&(p->saddr), hostname, port);
275 
276                 p->probe = get_probe(name);
277                 if (!p->probe) {
278                     fprintf(stderr, "line %d: %s: probe unknown\n", config_setting_source_line(prot), name);
279                     exit(1);
280                 }
281 
282                 /* Probe-specific options: regex patterns */
283                 if (!strcmp(name, "regex")) {
284                     patterns = config_setting_get_member(prot, "regex_patterns");
285                     if (patterns && config_setting_is_array(patterns)) {
286                         setup_regex_probe(p, patterns);
287                     }
288                 }
289 
290                 /* Probe-specific options: SNI hostnames */
291                 if (!strcmp(name, "sni")) {
292                     sni_hostnames = config_setting_get_member(prot, "sni_hostnames");
293                     if (sni_hostnames && config_setting_is_array(sni_hostnames)) {
294                         setup_sni_hostnames(p, sni_hostnames);
295                     }
296                 }
297             }
298         }
299     }
300 
301     return 0;
302 }
303 #endif
304 
305 /* Parses a config file
306  * in: *filename
307  * out: *listen, a newly-allocated linked list of listen addrinfo
308  *      *prots, a newly-allocated linked list of protocols
309  *      1 on error, 0 on success
310  */
311 #ifdef LIBCONFIG
312 static int config_parse(char *filename, struct addrinfo **listen, struct proto **prots)
313 {
314     config_t config;
315     int timeout;
316     const char* str;
317 
318     config_init(&config);
319     if (config_read_file(&config, filename) == CONFIG_FALSE) {
320         /* If it's a parse error then there will be a line number for the failure
321          * an I/O error (such as non-existent file) will have the error line as 0
322          */
323         if (config_error_line(&config) != 0) {
324             fprintf(stderr, "%s:%d:%s\n", 
325                     filename,
326                     config_error_line(&config),
327                     config_error_text(&config));
328             exit(1);
329         }
330         fprintf(stderr, "%s:%s\n", 
331                 filename,
332                 config_error_text(&config));
333         return 1;
334     }
335 
336     config_lookup_bool(&config, "verbose", &verbose);
337     config_lookup_bool(&config, "inetd", &inetd);
338     config_lookup_bool(&config, "foreground", &foreground);
339     config_lookup_bool(&config, "numeric", &numeric);
340     config_lookup_bool(&config, "transparent", &transparent);
341 
342     if (config_lookup_int(&config, "timeout", (int *)&timeout) == CONFIG_TRUE) {
343         probing_timeout = timeout;
344     }
345 
346     if (config_lookup_string(&config, "on-timeout", &str)) {
347         set_ontimeout(str);
348     }
349 
350     config_lookup_string(&config, "user", &user_name);
351     config_lookup_string(&config, "pidfile", &pid_file);
352 
353     config_listen(&config, listen);
354     config_protocols(&config, prots);
355 
356     return 0;
357 }
358 #endif
359 
360 /* Adds protocols to the list of options, so command-line parsing uses the
361  * protocol definition array 
362  * options: array of options to add to; must be big enough
363  * n_opts: number of options in *options before calling (i.e. where to append)
364  * prot: array of protocols
365  * n_prots: number of protocols in *prot
366  * */
367 static void append_protocols(struct option *options, int n_opts, struct proto *prot , int n_prots)
368 {
369     int o, p;
370 
371     for (o = n_opts, p = 0; p < n_prots; o++, p++) {
372         options[o].name = prot[p].description;
373         options[o].has_arg = required_argument;
374         options[o].flag = 0;
375         options[o].val = p + PROT_SHIFT;
376     }
377 }
378 
379 static void make_alloptions(void)
380 {
381     builtins = get_builtins();
382 
383     /* Create all_options, composed of const_options followed by one option per
384      * known protocol */
385     all_options = calloc(ARRAY_SIZE(const_options) + get_num_builtins(), sizeof(struct option));
386     memcpy(all_options, const_options, sizeof(const_options));
387     append_protocols(all_options, ARRAY_SIZE(const_options) - 1, builtins, get_num_builtins());
388 }
389 
390 /* Performs a first scan of command line options to see if a configuration file
391  * is specified. If there is one, parse it now before all other options (so
392  * configuration file settings can be overridden from the command line).
393  *
394  * prots: newly-allocated list of configured protocols, if any.
395  */
396 static void cmdline_config(int argc, char* argv[], struct proto** prots)
397 {
398 #ifdef LIBCONFIG
399     int c, res;
400     char *config_filename;
401 #endif
402 
403     make_alloptions();
404 
405 #ifdef LIBCONFIG
406     optind = 1;
407     opterr = 0; /* we're missing protocol options at this stage so don't output errors */
408     while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
409         if (c == 'v') {
410             verbose++;
411         }
412         if (c == 'F') {
413             config_filename = optarg;
414             if (config_filename) {
415                 res = config_parse(config_filename, &addr_listen, prots);
416             } else {
417                 /* No configuration file specified -- try default file locations */
418                 res = config_parse("/etc/sslh/sslh.cfg", &addr_listen, prots);
419                 if (!res && verbose) fprintf(stderr, "Using /etc/sslh/sslh.cfg\n");
420                 if (res) {
421                     res = config_parse("/etc/sslh.cfg", &addr_listen, prots);
422                     if (!res && verbose) fprintf(stderr, "Using /etc/sslh.cfg\n");
423                 }
424             }
425             if (res)
426                 exit(4);
427             break;
428         }
429     }
430 #endif
431 }
432 
433 
434 /* Parse command-line options. prots points to a list of configured protocols,
435  * potentially non-allocated */
436 static void parse_cmdline(int argc, char* argv[], struct proto* prots)
437 {
438     int c;
439     struct addrinfo **a;
440     struct proto *p;
441 
442     optind = 1;
443     opterr = 1;
444 next_arg:
445     while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
446         if (c == 0) continue;
447 
448         if (c >= PROT_SHIFT) {
449             if (prots)
450                 for (p = prots; p && p->next; p = p->next) {
451                     /* override if protocol was already defined by config file 
452                      * (note it only overrides address and use builtin probe) */
453                     if (!strcmp(p->description, builtins[c-PROT_SHIFT].description)) {
454                         resolve_name(&(p->saddr), optarg);
455                         p->probe = builtins[c-PROT_SHIFT].probe;
456                         goto next_arg;
457                     }
458                 }
459             /* At this stage, it's a new protocol: add it to the end of the
460              * list */
461             if (!prots) {
462                 /* No protocols yet -- create the list */
463                 p = prots = calloc(1, sizeof(*p));
464             } else {
465                 p->next = calloc(1, sizeof(*p));
466                 p = p->next;
467             }
468             memcpy(p, &builtins[c-PROT_SHIFT], sizeof(*p));
469             resolve_name(&(p->saddr), optarg);
470             continue;
471         }
472 
473         switch (c) {
474 
475         case 'F':
476             /* Legal option, but do nothing, it was already processed in
477              * cmdline_config() */
478 #ifndef LIBCONFIG
479             fprintf(stderr, "Built without libconfig support: configuration file not available.\n");
480             exit(1);
481 #endif
482             break;
483 
484         case 't':
485              probing_timeout = atoi(optarg);
486             break;
487 
488         case OPT_ONTIMEOUT:
489             set_ontimeout(optarg);
490             break;
491 
492         case 'p':
493             /* find the end of the listen list */
494             for (a = &addr_listen; *a; a = &((*a)->ai_next));
495             /* append the specified addresses */
496             resolve_name(a, optarg);
497             
498             break;
499 
500         case 'V':
501             printf("%s %s\n", server_type, VERSION);
502             exit(0);
503 
504         case 'u':
505             user_name = optarg;
506             break;
507 
508         case 'P':
509             pid_file = optarg;
510             break;
511 
512         case 'v':
513             verbose++;
514             break;
515 
516         default:
517             print_usage();
518             exit(2);
519         }
520     }
521 
522     if (!prots) {
523         fprintf(stderr, "At least one target protocol must be specified.\n");
524         exit(2);
525     }
526 
527     set_protocol_list(prots);
528 
529     if (!addr_listen && !inetd) {
530         fprintf(stderr, "No listening address specified; use at least one -p option\n");
531         exit(1);
532     }
533 
534     /* Did command-line override foreground setting? */
535     if (background)
536         foreground = 0;
537 
538 }
539 
540 int main(int argc, char *argv[])
541 {
542 
543    extern char *optarg;
544    extern int optind;
545    int res, num_addr_listen;
546    struct proto* protocols = NULL;
547 
548    int *listen_sockets;
549 
550    /* Init defaults */
551    pid_file = NULL;
552    user_name = NULL;
553 
554    cmdline_config(argc, argv, &protocols);
555    parse_cmdline(argc, argv, protocols);
556 
557    if (inetd)
558    {
559        verbose = 0;
560        start_shoveler(0);
561        exit(0);
562    }
563 
564    if (verbose)
565        printsettings();
566 
567    num_addr_listen = start_listen_sockets(&listen_sockets, addr_listen);
568 
569    if (!foreground) {
570        if (fork() > 0) exit(0); /* Detach */
571 
572        /* New session -- become group leader */
573        if (getuid() == 0) {
574            res = setsid();
575            CHECK_RES_DIE(res, "setsid: already process leader");
576        }
577    }
578 
579    setup_signals();
580 
581    if (pid_file)
582        write_pid_file(pid_file);
583 
584    if (user_name)
585        drop_privileges(user_name);
586 
587 
588    /* Open syslog connection */
589    setup_syslog(argv[0]);
590 
591    if (verbose)
592        printcaps();
593 
594    main_loop(listen_sockets, num_addr_listen);
595 
596    return 0;
597 }
598

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cel / sslh

Tree: b108809a78dbedce34bf8dee060fd4a2e72480c8

Files: b108809a78dbedce34bf8dee060fd4a2e72480c8 / sslh-main.c

1	/*
2	# main: processing of config file, command line options and start the main
3	# loop.
4	#
5	# Copyright (C) 2007-2014 Yves Rutschle
6	#
7	# This program is free software; you can redistribute it
8	# and/or modify it under the terms of the GNU General Public
9	# License as published by the Free Software Foundation; either
10	# version 2 of the License, or (at your option) any later
11	# version.
12	#
13	# This program is distributed in the hope that it will be
14	# useful, but WITHOUT ANY WARRANTY; without even the implied
15	# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
16	# PURPOSE. See the GNU General Public License for more
17	# details.
18	#
19	# The full text for the General Public License is here:
20	# http://www.gnu.org/licenses/gpl.html
21
22	*/
23
24	#define _GNU_SOURCE
25	#ifdef LIBCONFIG
26	#include <libconfig.h>
27	#endif
28	#ifdef LIBPCRE
29	#include <regex.h>
30	#endif
31
32	#include "common.h"
33	#include "probe.h"
34
35	const char* USAGE_STRING =
36	"sslh " VERSION "\n" \
37	"usage:\n" \
38	"\tsslh [-v] [-i] [-V] [-f] [-n] [--transparent] [-F <file>]\n"
39	"\t[-t <timeout>] [-P <pidfile>] -u <username> -p <add> [-p <addr> ...] \n" \
40	"%s\n\n" /* Dynamically built list of builtin protocols */ \
41	"\t[--on-timeout <addr>]\n" \
42	"-v: verbose\n" \
43	"-V: version\n" \
44	"-f: foreground\n" \
45	"-n: numeric output\n" \
46	"-u: specify under which user to run\n" \
47	"--transparent: behave as a transparent proxy\n" \
48	"-F: use configuration file\n" \
49	"--on-timeout: connect to specified address upon timeout (default: ssh address)\n" \
50	"-t: seconds to wait before connecting to --on-timeout address.\n" \
51	"-p: address and port to listen on.\n Can be used several times to bind to several addresses.\n" \
52	"--[ssh,ssl,...]: where to connect connections from corresponding protocol.\n" \
53	"-P: PID file.\n" \
54	"-i: Run as a inetd service.\n" \
55	"";
56
57	/* Constants for options that have no one-character shorthand */
58	#define OPT_ONTIMEOUT 257
59
60	static struct option const_options[] = {
61	{ "inetd", no_argument, &inetd, 1 },
62	{ "foreground", no_argument, &foreground, 1 },
63	{ "background", no_argument, &background, 1 },
64	{ "transparent", no_argument, &transparent, 1 },
65	{ "numeric", no_argument, &numeric, 1 },
66	{ "verbose", no_argument, &verbose, 1 },
67	{ "user", required_argument, 0, 'u' },
68	{ "config", optional_argument, 0, 'F' },
69	{ "pidfile", required_argument, 0, 'P' },
70	{ "timeout", required_argument, 0, 't' },
71	{ "on-timeout", required_argument, 0, OPT_ONTIMEOUT },
72	{ "listen", required_argument, 0, 'p' },
73	{}
74	};
75	static struct option* all_options;
76	static struct proto* builtins;
77	static const char *optstr = "vt:T:p:VP:F::";
78
79
80
81	static void print_usage(void)
82	{
83	struct proto *p;
84	int i;
85	int res;
86	char *prots = "";
87
88	p = get_builtins();
89	for (i = 0; i < get_num_builtins(); i++) {
90	res = asprintf(&prots, "%s\t[--%s <addr>]\n", prots, p[i].description);
91	CHECK_RES_DIE(res, "asprintf");
92	}
93
94	fprintf(stderr, USAGE_STRING, prots);
95	}
96
97	static void printcaps(void) {
98	#ifdef LIBCAP
99	cap_t caps;
100	char* desc;
101	ssize_t len;
102
103	caps = cap_get_proc();
104
105	desc = cap_to_text(caps, &len);
106
107	fprintf(stderr, "capabilities: %s\n", desc);
108
109	cap_free(caps);
110	cap_free(desc);
111	#endif
112	}
113
114	static void printsettings(void)
115	{
116	char buf[NI_MAXHOST];
117	struct addrinfo *a;
118	struct proto *p;
119
120	for (p = get_first_protocol(); p; p = p->next) {
121	fprintf(stderr,
122	"%s addr: %s. libwrap service: %s family %d %d\n",
123	p->description,
124	sprintaddr(buf, sizeof(buf), p->saddr),
125	p->service,
126	p->saddr->ai_family,
127	p->saddr->ai_addr->sa_family);
128	}
129	fprintf(stderr, "listening on:\n");
130	for (a = addr_listen; a; a = a->ai_next) {
131	fprintf(stderr, "\t%s\n", sprintaddr(buf, sizeof(buf), a));
132	}
133	fprintf(stderr, "timeout: %d\non-timeout: %s\n", probing_timeout,
134	timeout_protocol()->description);
135	}
136
137
138	/* Extract configuration on addresses and ports on which to listen.
139	* out: newly allocated list of addrinfo to listen to
140	*/
141	#ifdef LIBCONFIG
142	static int config_listen(config_t config, struct addrinfo *listen)
143	{
144	config_setting_t setting, addr;
145	int len, i;
146	const char hostname, port;
147
148	setting = config_lookup(config, "listen");
149	if (setting) {
150	len = config_setting_length(setting);
151	for (i = 0; i < len; i++) {
152	addr = config_setting_get_elem(setting, i);
153	if (! (config_setting_lookup_string(addr, "host", &hostname) &&
154	config_setting_lookup_string(addr, "port", &port))) {
155	fprintf(stderr,
156	"line %d:Incomplete specification (hostname and port required)\n",
157	config_setting_source_line(addr));
158	return -1;
159	}
160
161	resolve_split_name(listen, hostname, port);
162
163	/* getaddrinfo returned a list of addresses corresponding to the
164	* specification; move the pointer to the end of that list before
165	* processing the next specification */
166	for (; listen; listen = &((listen)->ai_next));
167	}
168	}
169
170	return 0;
171	}
172	#endif
173
174
175
176	#ifdef LIBCONFIG
177	static void setup_regex_probe(struct proto p, config_setting_t probes)
178	{
179	#ifdef LIBPCRE
180	int num_probes, errsize, i, res;
181	char *err;
182	const char * expr;
183	regex_t** probe_list;
184
185	num_probes = config_setting_length(probes);
186	if (!num_probes) {
187	fprintf(stderr, "%s: no probes specified\n", p->description);
188	exit(1);
189	}
190
191	p->probe = get_probe("regex");
192	probe_list = calloc(num_probes + 1, sizeof(*probe_list));
193	p->data = (void*)probe_list;
194
195	for (i = 0; i < num_probes; i++) {
196	probe_list[i] = malloc(sizeof(*(probe_list[i])));
197	expr = config_setting_get_string_elem(probes, i);
198	res = regcomp(probe_list[i], expr, 0);
199	if (res) {
200	err = malloc(errsize = regerror(res, probe_list[i], NULL, 0));
201	regerror(res, probe_list[i], err, errsize);
202	fprintf(stderr, "%s:%s\n", expr, err);
203	free(err);
204	exit(1);
205	}
206	}
207	#else
208	fprintf(stderr, "line %d: regex probe specified but not compiled in\n", config_setting_source_line(probes));
209	exit(5);
210	#endif
211	}
212	#endif
213
214	#ifdef LIBCONFIG
215	static void setup_sni_hostnames(struct proto p, config_setting_t sni_hostnames)
216	{
217	int num_probes, i, max_server_name_len, server_name_len;
218	const char * sni_hostname;
219	char** sni_hostname_list;
220
221	num_probes = config_setting_length(sni_hostnames);
222	if (!num_probes) {
223	fprintf(stderr, "%s: no sni_hostnames specified\n", p->description);
224	exit(1);
225	}
226
227	max_server_name_len = 0;
228	for (i = 0; i < num_probes; i++) {
229	server_name_len = strlen(config_setting_get_string_elem(sni_hostnames, i));
230	if(server_name_len > max_server_name_len)
231	max_server_name_len = server_name_len;
232	}
233
234	sni_hostname_list = calloc(num_probes + 1, ++max_server_name_len);
235	p->data = (void*)sni_hostname_list;
236
237	for (i = 0; i < num_probes; i++) {
238	sni_hostname = config_setting_get_string_elem(sni_hostnames, i);
239	sni_hostname_list[i] = malloc(max_server_name_len);
240	strcpy (sni_hostname_list[i], sni_hostname);
241	if(verbose) fprintf(stderr, "sni_hostnames[%d]: %s\n", i, sni_hostname_list[i]);
242	}
243	}
244	#endif
245
246	/* Extract configuration for protocols to connect to.
247	* out: newly-allocated list of protocols
248	*/
249	#ifdef LIBCONFIG
250	static int config_protocols(config_t config, struct proto *prots)
251	{
252	config_setting_t setting, prot, patterns, sni_hostnames;
253	const char hostname, port, *name;
254	int i, num_prots;
255	struct proto p, prev = NULL;
256
257	setting = config_lookup(config, "protocols");
258	if (setting) {
259	num_prots = config_setting_length(setting);
260	for (i = 0; i < num_prots; i++) {
261	p = calloc(1, sizeof(*p));
262	if (i == 0) *prots = p;
263	if (prev) prev->next = p;
264	prev = p;
265
266	prot = config_setting_get_elem(setting, i);
267	if ((config_setting_lookup_string(prot, "name", &name) &&
268	config_setting_lookup_string(prot, "host", &hostname) &&
269	config_setting_lookup_string(prot, "port", &port)
270	)) {
271	p->description = name;
272	config_setting_lookup_string(prot, "service", &(p->service));
273
274	resolve_split_name(&(p->saddr), hostname, port);
275
276	p->probe = get_probe(name);
277	if (!p->probe) {
278	fprintf(stderr, "line %d: %s: probe unknown\n", config_setting_source_line(prot), name);
279	exit(1);
280	}
281
282	/* Probe-specific options: regex patterns */
283	if (!strcmp(name, "regex")) {
284	patterns = config_setting_get_member(prot, "regex_patterns");
285	if (patterns && config_setting_is_array(patterns)) {
286	setup_regex_probe(p, patterns);
287	}
288	}
289
290	/* Probe-specific options: SNI hostnames */
291	if (!strcmp(name, "sni")) {
292	sni_hostnames = config_setting_get_member(prot, "sni_hostnames");
293	if (sni_hostnames && config_setting_is_array(sni_hostnames)) {
294	setup_sni_hostnames(p, sni_hostnames);
295	}
296	}
297	}
298	}
299	}
300
301	return 0;
302	}
303	#endif
304
305	/* Parses a config file
306	* in: *filename
307	* out: *listen, a newly-allocated linked list of listen addrinfo
308	* *prots, a newly-allocated linked list of protocols
309	* 1 on error, 0 on success
310	*/
311	#ifdef LIBCONFIG
312	static int config_parse(char filename, struct addrinfo listen, struct proto *prots)
313	{
314	config_t config;
315	int timeout;
316	const char* str;
317
318	config_init(&config);
319	if (config_read_file(&config, filename) == CONFIG_FALSE) {
320	/* If it's a parse error then there will be a line number for the failure
321	* an I/O error (such as non-existent file) will have the error line as 0
322	*/
323	if (config_error_line(&config) != 0) {
324	fprintf(stderr, "%s:%d:%s\n",
325	filename,
326	config_error_line(&config),
327	config_error_text(&config));
328	exit(1);
329	}
330	fprintf(stderr, "%s:%s\n",
331	filename,
332	config_error_text(&config));
333	return 1;
334	}
335
336	config_lookup_bool(&config, "verbose", &verbose);
337	config_lookup_bool(&config, "inetd", &inetd);
338	config_lookup_bool(&config, "foreground", &foreground);
339	config_lookup_bool(&config, "numeric", &numeric);
340	config_lookup_bool(&config, "transparent", &transparent);
341
342	if (config_lookup_int(&config, "timeout", (int *)&timeout) == CONFIG_TRUE) {
343	probing_timeout = timeout;
344	}
345
346	if (config_lookup_string(&config, "on-timeout", &str)) {
347	set_ontimeout(str);
348	}
349
350	config_lookup_string(&config, "user", &user_name);
351	config_lookup_string(&config, "pidfile", &pid_file);
352
353	config_listen(&config, listen);
354	config_protocols(&config, prots);
355
356	return 0;
357	}
358	#endif
359
360	/* Adds protocols to the list of options, so command-line parsing uses the
361	* protocol definition array
362	* options: array of options to add to; must be big enough
363	* n_opts: number of options in *options before calling (i.e. where to append)
364	* prot: array of protocols
365	* n_prots: number of protocols in *prot
366	* */
367	static void append_protocols(struct option options, int n_opts, struct proto prot , int n_prots)
368	{
369	int o, p;
370
371	for (o = n_opts, p = 0; p < n_prots; o++, p++) {
372	options[o].name = prot[p].description;
373	options[o].has_arg = required_argument;
374	options[o].flag = 0;
375	options[o].val = p + PROT_SHIFT;
376	}
377	}
378
379	static void make_alloptions(void)
380	{
381	builtins = get_builtins();
382
383	/* Create all_options, composed of const_options followed by one option per
384	* known protocol */
385	all_options = calloc(ARRAY_SIZE(const_options) + get_num_builtins(), sizeof(struct option));
386	memcpy(all_options, const_options, sizeof(const_options));
387	append_protocols(all_options, ARRAY_SIZE(const_options) - 1, builtins, get_num_builtins());
388	}
389
390	/* Performs a first scan of command line options to see if a configuration file
391	* is specified. If there is one, parse it now before all other options (so
392	* configuration file settings can be overridden from the command line).
393	*
394	* prots: newly-allocated list of configured protocols, if any.
395	*/
396	static void cmdline_config(int argc, char* argv[], struct proto** prots)
397	{
398	#ifdef LIBCONFIG
399	int c, res;
400	char *config_filename;
401	#endif
402
403	make_alloptions();
404
405	#ifdef LIBCONFIG
406	optind = 1;
407	opterr = 0; /* we're missing protocol options at this stage so don't output errors */
408	while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
409	if (c == 'v') {
410	verbose++;
411	}
412	if (c == 'F') {
413	config_filename = optarg;
414	if (config_filename) {
415	res = config_parse(config_filename, &addr_listen, prots);
416	} else {
417	/* No configuration file specified -- try default file locations */
418	res = config_parse("/etc/sslh/sslh.cfg", &addr_listen, prots);
419	if (!res && verbose) fprintf(stderr, "Using /etc/sslh/sslh.cfg\n");
420	if (res) {
421	res = config_parse("/etc/sslh.cfg", &addr_listen, prots);
422	if (!res && verbose) fprintf(stderr, "Using /etc/sslh.cfg\n");
423	}
424	}
425	if (res)
426	exit(4);
427	break;
428	}
429	}
430	#endif
431	}
432
433
434	/* Parse command-line options. prots points to a list of configured protocols,
435	* potentially non-allocated */
436	static void parse_cmdline(int argc, char* argv[], struct proto* prots)
437	{
438	int c;
439	struct addrinfo **a;
440	struct proto *p;
441
442	optind = 1;
443	opterr = 1;
444	next_arg:
445	while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
446	if (c == 0) continue;
447
448	if (c >= PROT_SHIFT) {
449	if (prots)
450	for (p = prots; p && p->next; p = p->next) {
451	/* override if protocol was already defined by config file
452	* (note it only overrides address and use builtin probe) */
453	if (!strcmp(p->description, builtins[c-PROT_SHIFT].description)) {
454	resolve_name(&(p->saddr), optarg);
455	p->probe = builtins[c-PROT_SHIFT].probe;
456	goto next_arg;
457	}
458	}
459	/* At this stage, it's a new protocol: add it to the end of the
460	* list */
461	if (!prots) {
462	/* No protocols yet -- create the list */
463	p = prots = calloc(1, sizeof(*p));
464	} else {
465	p->next = calloc(1, sizeof(*p));
466	p = p->next;
467	}
468	memcpy(p, &builtins[c-PROT_SHIFT], sizeof(*p));
469	resolve_name(&(p->saddr), optarg);
470	continue;
471	}
472
473	switch (c) {
474
475	case 'F':
476	/* Legal option, but do nothing, it was already processed in
477	* cmdline_config() */
478	#ifndef LIBCONFIG
479	fprintf(stderr, "Built without libconfig support: configuration file not available.\n");
480	exit(1);
481	#endif
482	break;
483
484	case 't':
485	probing_timeout = atoi(optarg);
486	break;
487
488	case OPT_ONTIMEOUT:
489	set_ontimeout(optarg);
490	break;
491
492	case 'p':
493	/* find the end of the listen list */
494	for (a = &addr_listen; a; a = &((a)->ai_next));
495	/* append the specified addresses */
496	resolve_name(a, optarg);
497
498	break;
499
500	case 'V':
501	printf("%s %s\n", server_type, VERSION);
502	exit(0);
503
504	case 'u':
505	user_name = optarg;
506	break;
507
508	case 'P':
509	pid_file = optarg;
510	break;
511
512	case 'v':
513	verbose++;
514	break;
515
516	default:
517	print_usage();
518	exit(2);
519	}
520	}
521
522	if (!prots) {
523	fprintf(stderr, "At least one target protocol must be specified.\n");
524	exit(2);
525	}
526
527	set_protocol_list(prots);
528
529	if (!addr_listen && !inetd) {
530	fprintf(stderr, "No listening address specified; use at least one -p option\n");
531	exit(1);
532	}
533
534	/* Did command-line override foreground setting? */
535	if (background)
536	foreground = 0;
537
538	}
539
540	int main(int argc, char *argv[])
541	{
542
543	extern char *optarg;
544	extern int optind;
545	int res, num_addr_listen;
546	struct proto* protocols = NULL;
547
548	int *listen_sockets;
549
550	/* Init defaults */
551	pid_file = NULL;
552	user_name = NULL;
553
554	cmdline_config(argc, argv, &protocols);
555	parse_cmdline(argc, argv, protocols);
556
557	if (inetd)
558	{
559	verbose = 0;
560	start_shoveler(0);
561	exit(0);
562	}
563
564	if (verbose)
565	printsettings();
566
567	num_addr_listen = start_listen_sockets(&listen_sockets, addr_listen);
568
569	if (!foreground) {
570	if (fork() > 0) exit(0); /* Detach */
571
572	/* New session -- become group leader */
573	if (getuid() == 0) {
574	res = setsid();
575	CHECK_RES_DIE(res, "setsid: already process leader");
576	}
577	}
578
579	setup_signals();
580
581	if (pid_file)
582	write_pid_file(pid_file);
583
584	if (user_name)
585	drop_privileges(user_name);
586
587
588	/* Open syslog connection */
589	setup_syslog(argv[0]);
590
591	if (verbose)
592	printcaps();
593
594	main_loop(listen_sockets, num_addr_listen);
595
596	return 0;
597	}
598

cel / sslh

Tree: b108809a78dbedce34bf8dee060fd4a2e72480c8 shsmasterv1.9v1.8v1.7v1.6v1.5v1.3v1.2v1.18v1.17v1.16v1.15v1.14v1.13v1.12v1.11v1.10v1.1v1.0 <input type="submit" value="Go"/>

Files: b108809a78dbedce34bf8dee060fd4a2e72480c8 / sslh-main.c

Tree: b108809a78dbedce34bf8dee060fd4a2e72480c8