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Files: ca461ea077d748dde25eb6610e66514fa0151baf / sslh-main.c

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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  */
310 #ifdef LIBCONFIG
311 static int config_parse(char *filename, struct addrinfo **listen, struct proto **prots)
312 {
313     config_t config;
314     int timeout;
315     const char* str;
316 
317     config_init(&config);
318     if (config_read_file(&config, filename) == CONFIG_FALSE) {
319         /* If it's a parse error then there will be a line number for the failure
320          * an I/O error (such as non-existent file) will have the error line as 0
321          */
322         fprintf(stderr, "%s:%d:%s\n", 
323                 filename,
324                 config_error_line(&config),
325                 config_error_text(&config));
326         exit(1);
327     }
328 
329     config_lookup_bool(&config, "verbose", &verbose);
330     config_lookup_bool(&config, "inetd", &inetd);
331     config_lookup_bool(&config, "foreground", &foreground);
332     config_lookup_bool(&config, "numeric", &numeric);
333     config_lookup_bool(&config, "transparent", &transparent);
334 
335     if (config_lookup_int(&config, "timeout", (int *)&timeout) == CONFIG_TRUE) {
336         probing_timeout = timeout;
337     }
338 
339     if (config_lookup_string(&config, "on-timeout", &str)) {
340         set_ontimeout(str);
341     }
342 
343     config_lookup_string(&config, "user", &user_name);
344     config_lookup_string(&config, "pidfile", &pid_file);
345 
346     config_listen(&config, listen);
347     config_protocols(&config, prots);
348 
349     return 0;
350 }
351 #endif
352 
353 /* Adds protocols to the list of options, so command-line parsing uses the
354  * protocol definition array 
355  * options: array of options to add to; must be big enough
356  * n_opts: number of options in *options before calling (i.e. where to append)
357  * prot: array of protocols
358  * n_prots: number of protocols in *prot
359  * */
360 static void append_protocols(struct option *options, int n_opts, struct proto *prot , int n_prots)
361 {
362     int o, p;
363 
364     for (o = n_opts, p = 0; p < n_prots; o++, p++) {
365         options[o].name = prot[p].description;
366         options[o].has_arg = required_argument;
367         options[o].flag = 0;
368         options[o].val = p + PROT_SHIFT;
369     }
370 }
371 
372 static void make_alloptions(void)
373 {
374     builtins = get_builtins();
375 
376     /* Create all_options, composed of const_options followed by one option per
377      * known protocol */
378     all_options = calloc(ARRAY_SIZE(const_options) + get_num_builtins(), sizeof(struct option));
379     memcpy(all_options, const_options, sizeof(const_options));
380     append_protocols(all_options, ARRAY_SIZE(const_options) - 1, builtins, get_num_builtins());
381 }
382 
383 /* Performs a first scan of command line options to see if a configuration file
384  * is specified. If there is one, parse it now before all other options (so
385  * configuration file settings can be overridden from the command line).
386  *
387  * prots: newly-allocated list of configured protocols, if any.
388  */
389 static void cmdline_config(int argc, char* argv[], struct proto** prots)
390 {
391 #ifdef LIBCONFIG
392     int c, res;
393     char *config_filename;
394 #endif
395 
396     make_alloptions();
397 
398 #ifdef LIBCONFIG
399     optind = 1;
400     opterr = 0; /* we're missing protocol options at this stage so don't output errors */
401     while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
402         if (c == 'F') {
403             config_filename = optarg;
404             if (config_filename) {
405                 fprintf(stderr, "config: %s\n", config_filename);
406                 res = config_parse(config_filename, &addr_listen, prots);
407             } else {
408                 /* No configuration file specified -- try default file locations */
409                 res = config_parse("/etc/sslh/sslh.cfg", &addr_listen, prots);
410                 if (!res && verbose) fprintf(stderr, "Using /etc/sslh/sslh.cfg\n");
411                 if (res) {
412                     res = config_parse("/etc/sslh.cfg", &addr_listen, prots);
413                     if (!res && verbose) fprintf(stderr, "Using /etc/sslh.cfg\n");
414                 }
415             }
416             if (res)
417                 exit(4);
418             break;
419         }
420     }
421 #endif
422 }
423 
424 
425 /* Parse command-line options. prots points to a list of configured protocols,
426  * potentially non-allocated */
427 static void parse_cmdline(int argc, char* argv[], struct proto* prots)
428 {
429     int c;
430     struct addrinfo **a;
431     struct proto *p;
432 
433     optind = 1;
434     opterr = 1;
435 next_arg:
436     while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
437         if (c == 0) continue;
438 
439         if (c >= PROT_SHIFT) {
440             if (prots)
441                 for (p = prots; p && p->next; p = p->next) {
442                     /* override if protocol was already defined by config file 
443                      * (note it only overrides address and use builtin probe) */
444                     if (!strcmp(p->description, builtins[c-PROT_SHIFT].description)) {
445                         resolve_name(&(p->saddr), optarg);
446                         p->probe = builtins[c-PROT_SHIFT].probe;
447                         goto next_arg;
448                     }
449                 }
450             /* At this stage, it's a new protocol: add it to the end of the
451              * list */
452             if (!prots) {
453                 /* No protocols yet -- create the list */
454                 p = prots = calloc(1, sizeof(*p));
455             } else {
456                 p->next = calloc(1, sizeof(*p));
457                 p = p->next;
458             }
459             memcpy(p, &builtins[c-PROT_SHIFT], sizeof(*p));
460             resolve_name(&(p->saddr), optarg);
461             continue;
462         }
463 
464         switch (c) {
465 
466         case 'F':
467             /* Legal option, but do nothing, it was already processed in
468              * cmdline_config() */
469 #ifndef LIBCONFIG
470             fprintf(stderr, "Built without libconfig support: configuration file not available.\n");
471             exit(1);
472 #endif
473             break;
474 
475         case 't':
476              probing_timeout = atoi(optarg);
477             break;
478 
479         case OPT_ONTIMEOUT:
480             set_ontimeout(optarg);
481             break;
482 
483         case 'p':
484             /* find the end of the listen list */
485             for (a = &addr_listen; *a; a = &((*a)->ai_next));
486             /* append the specified addresses */
487             resolve_name(a, optarg);
488             
489             break;
490 
491         case 'V':
492             printf("%s %s\n", server_type, VERSION);
493             exit(0);
494 
495         case 'u':
496             user_name = optarg;
497             break;
498 
499         case 'P':
500             pid_file = optarg;
501             break;
502 
503         case 'v':
504             verbose++;
505             break;
506 
507         default:
508             print_usage();
509             exit(2);
510         }
511     }
512 
513     if (!prots) {
514         fprintf(stderr, "At least one target protocol must be specified.\n");
515         exit(2);
516     }
517 
518     set_protocol_list(prots);
519 
520     if (!addr_listen && !inetd) {
521         fprintf(stderr, "No listening address specified; use at least one -p option\n");
522         exit(1);
523     }
524 
525     /* Did command-line override foreground setting? */
526     if (background)
527         foreground = 0;
528 
529 }
530 
531 int main(int argc, char *argv[])
532 {
533 
534    extern char *optarg;
535    extern int optind;
536    int res, num_addr_listen;
537    struct proto* protocols = NULL;
538 
539    int *listen_sockets;
540 
541    /* Init defaults */
542    pid_file = NULL;
543    user_name = NULL;
544 
545    cmdline_config(argc, argv, &protocols);
546    parse_cmdline(argc, argv, protocols);
547 
548    if (inetd)
549    {
550        verbose = 0;
551        start_shoveler(0);
552        exit(0);
553    }
554 
555    if (verbose)
556        printsettings();
557 
558    num_addr_listen = start_listen_sockets(&listen_sockets, addr_listen);
559 
560    if (!foreground) {
561        if (fork() > 0) exit(0); /* Detach */
562 
563        /* New session -- become group leader */
564        if (getuid() == 0) {
565            res = setsid();
566            CHECK_RES_DIE(res, "setsid: already process leader");
567        }
568    }
569 
570    setup_signals();
571 
572    if (pid_file)
573        write_pid_file(pid_file);
574 
575    if (user_name)
576        drop_privileges(user_name);
577 
578 
579    /* Open syslog connection */
580    setup_syslog(argv[0]);
581 
582    if (verbose)
583        printcaps();
584 
585    main_loop(listen_sockets, num_addr_listen);
586 
587    return 0;
588 }
589

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cel / sslh

Tree: ca461ea077d748dde25eb6610e66514fa0151baf

Files: ca461ea077d748dde25eb6610e66514fa0151baf / 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	*/
310	#ifdef LIBCONFIG
311	static int config_parse(char filename, struct addrinfo listen, struct proto *prots)
312	{
313	config_t config;
314	int timeout;
315	const char* str;
316
317	config_init(&config);
318	if (config_read_file(&config, filename) == CONFIG_FALSE) {
319	/* If it's a parse error then there will be a line number for the failure
320	* an I/O error (such as non-existent file) will have the error line as 0
321	*/
322	fprintf(stderr, "%s:%d:%s\n",
323	filename,
324	config_error_line(&config),
325	config_error_text(&config));
326	exit(1);
327	}
328
329	config_lookup_bool(&config, "verbose", &verbose);
330	config_lookup_bool(&config, "inetd", &inetd);
331	config_lookup_bool(&config, "foreground", &foreground);
332	config_lookup_bool(&config, "numeric", &numeric);
333	config_lookup_bool(&config, "transparent", &transparent);
334
335	if (config_lookup_int(&config, "timeout", (int *)&timeout) == CONFIG_TRUE) {
336	probing_timeout = timeout;
337	}
338
339	if (config_lookup_string(&config, "on-timeout", &str)) {
340	set_ontimeout(str);
341	}
342
343	config_lookup_string(&config, "user", &user_name);
344	config_lookup_string(&config, "pidfile", &pid_file);
345
346	config_listen(&config, listen);
347	config_protocols(&config, prots);
348
349	return 0;
350	}
351	#endif
352
353	/* Adds protocols to the list of options, so command-line parsing uses the
354	* protocol definition array
355	* options: array of options to add to; must be big enough
356	* n_opts: number of options in *options before calling (i.e. where to append)
357	* prot: array of protocols
358	* n_prots: number of protocols in *prot
359	* */
360	static void append_protocols(struct option options, int n_opts, struct proto prot , int n_prots)
361	{
362	int o, p;
363
364	for (o = n_opts, p = 0; p < n_prots; o++, p++) {
365	options[o].name = prot[p].description;
366	options[o].has_arg = required_argument;
367	options[o].flag = 0;
368	options[o].val = p + PROT_SHIFT;
369	}
370	}
371
372	static void make_alloptions(void)
373	{
374	builtins = get_builtins();
375
376	/* Create all_options, composed of const_options followed by one option per
377	* known protocol */
378	all_options = calloc(ARRAY_SIZE(const_options) + get_num_builtins(), sizeof(struct option));
379	memcpy(all_options, const_options, sizeof(const_options));
380	append_protocols(all_options, ARRAY_SIZE(const_options) - 1, builtins, get_num_builtins());
381	}
382
383	/* Performs a first scan of command line options to see if a configuration file
384	* is specified. If there is one, parse it now before all other options (so
385	* configuration file settings can be overridden from the command line).
386	*
387	* prots: newly-allocated list of configured protocols, if any.
388	*/
389	static void cmdline_config(int argc, char* argv[], struct proto** prots)
390	{
391	#ifdef LIBCONFIG
392	int c, res;
393	char *config_filename;
394	#endif
395
396	make_alloptions();
397
398	#ifdef LIBCONFIG
399	optind = 1;
400	opterr = 0; /* we're missing protocol options at this stage so don't output errors */
401	while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
402	if (c == 'F') {
403	config_filename = optarg;
404	if (config_filename) {
405	fprintf(stderr, "config: %s\n", config_filename);
406	res = config_parse(config_filename, &addr_listen, prots);
407	} else {
408	/* No configuration file specified -- try default file locations */
409	res = config_parse("/etc/sslh/sslh.cfg", &addr_listen, prots);
410	if (!res && verbose) fprintf(stderr, "Using /etc/sslh/sslh.cfg\n");
411	if (res) {
412	res = config_parse("/etc/sslh.cfg", &addr_listen, prots);
413	if (!res && verbose) fprintf(stderr, "Using /etc/sslh.cfg\n");
414	}
415	}
416	if (res)
417	exit(4);
418	break;
419	}
420	}
421	#endif
422	}
423
424
425	/* Parse command-line options. prots points to a list of configured protocols,
426	* potentially non-allocated */
427	static void parse_cmdline(int argc, char* argv[], struct proto* prots)
428	{
429	int c;
430	struct addrinfo **a;
431	struct proto *p;
432
433	optind = 1;
434	opterr = 1;
435	next_arg:
436	while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
437	if (c == 0) continue;
438
439	if (c >= PROT_SHIFT) {
440	if (prots)
441	for (p = prots; p && p->next; p = p->next) {
442	/* override if protocol was already defined by config file
443	* (note it only overrides address and use builtin probe) */
444	if (!strcmp(p->description, builtins[c-PROT_SHIFT].description)) {
445	resolve_name(&(p->saddr), optarg);
446	p->probe = builtins[c-PROT_SHIFT].probe;
447	goto next_arg;
448	}
449	}
450	/* At this stage, it's a new protocol: add it to the end of the
451	* list */
452	if (!prots) {
453	/* No protocols yet -- create the list */
454	p = prots = calloc(1, sizeof(*p));
455	} else {
456	p->next = calloc(1, sizeof(*p));
457	p = p->next;
458	}
459	memcpy(p, &builtins[c-PROT_SHIFT], sizeof(*p));
460	resolve_name(&(p->saddr), optarg);
461	continue;
462	}
463
464	switch (c) {
465
466	case 'F':
467	/* Legal option, but do nothing, it was already processed in
468	* cmdline_config() */
469	#ifndef LIBCONFIG
470	fprintf(stderr, "Built without libconfig support: configuration file not available.\n");
471	exit(1);
472	#endif
473	break;
474
475	case 't':
476	probing_timeout = atoi(optarg);
477	break;
478
479	case OPT_ONTIMEOUT:
480	set_ontimeout(optarg);
481	break;
482
483	case 'p':
484	/* find the end of the listen list */
485	for (a = &addr_listen; a; a = &((a)->ai_next));
486	/* append the specified addresses */
487	resolve_name(a, optarg);
488
489	break;
490
491	case 'V':
492	printf("%s %s\n", server_type, VERSION);
493	exit(0);
494
495	case 'u':
496	user_name = optarg;
497	break;
498
499	case 'P':
500	pid_file = optarg;
501	break;
502
503	case 'v':
504	verbose++;
505	break;
506
507	default:
508	print_usage();
509	exit(2);
510	}
511	}
512
513	if (!prots) {
514	fprintf(stderr, "At least one target protocol must be specified.\n");
515	exit(2);
516	}
517
518	set_protocol_list(prots);
519
520	if (!addr_listen && !inetd) {
521	fprintf(stderr, "No listening address specified; use at least one -p option\n");
522	exit(1);
523	}
524
525	/* Did command-line override foreground setting? */
526	if (background)
527	foreground = 0;
528
529	}
530
531	int main(int argc, char *argv[])
532	{
533
534	extern char *optarg;
535	extern int optind;
536	int res, num_addr_listen;
537	struct proto* protocols = NULL;
538
539	int *listen_sockets;
540
541	/* Init defaults */
542	pid_file = NULL;
543	user_name = NULL;
544
545	cmdline_config(argc, argv, &protocols);
546	parse_cmdline(argc, argv, protocols);
547
548	if (inetd)
549	{
550	verbose = 0;
551	start_shoveler(0);
552	exit(0);
553	}
554
555	if (verbose)
556	printsettings();
557
558	num_addr_listen = start_listen_sockets(&listen_sockets, addr_listen);
559
560	if (!foreground) {
561	if (fork() > 0) exit(0); /* Detach */
562
563	/* New session -- become group leader */
564	if (getuid() == 0) {
565	res = setsid();
566	CHECK_RES_DIE(res, "setsid: already process leader");
567	}
568	}
569
570	setup_signals();
571
572	if (pid_file)
573	write_pid_file(pid_file);
574
575	if (user_name)
576	drop_privileges(user_name);
577
578
579	/* Open syslog connection */
580	setup_syslog(argv[0]);
581
582	if (verbose)
583	printcaps();
584
585	main_loop(listen_sockets, num_addr_listen);
586
587	return 0;
588	}
589

cel / sslh

Tree: ca461ea077d748dde25eb6610e66514fa0151baf 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: ca461ea077d748dde25eb6610e66514fa0151baf / sslh-main.c

Tree: ca461ea077d748dde25eb6610e66514fa0151baf