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460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
5aff007d | 3 | * Copyright (C) 2004, 2007, 2008 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
d6ea854a RK |
18 | /** @file lib/addr.c |
19 | * @brief Socket address support */ | |
460b9539 | 20 | |
05b75f8d | 21 | #include "common.h" |
460b9539 | 22 | |
460b9539 | 23 | #include <sys/types.h> |
24 | #include <sys/socket.h> | |
25 | #include <netinet/in.h> | |
6fba990c RK |
26 | #include <arpa/inet.h> |
27 | #include <sys/un.h> | |
460b9539 | 28 | |
29 | #include "log.h" | |
30 | #include "printf.h" | |
460b9539 | 31 | #include "addr.h" |
6fba990c | 32 | #include "mem.h" |
76e72f65 RK |
33 | #include "syscalls.h" |
34 | #include "configuration.h" | |
35 | #include "vector.h" | |
460b9539 | 36 | |
ec6f8488 | 37 | /** @brief Convert a pair of strings to an address |
38 | * @param a Pointer to string list | |
39 | * @param pref Hints structure for getaddrinfo, or NULL | |
40 | * @param namep Where to store address description, or NULL | |
41 | * @return Address info structure or NULL on error | |
42 | * | |
43 | * This converts one or two strings into an address specification suitable | |
44 | * for passing to socket(), bind() etc. | |
45 | * | |
46 | * If there is only one string then it is assumed to be the service | |
47 | * name (port number). If there are two then the first is the host | |
48 | * name and the second the service name. | |
49 | * | |
50 | * @p namep is used to return a description of the address suitable | |
51 | * for use in log messages. | |
52 | * | |
53 | * If an error occurs a message is logged and a null pointer returned. | |
54 | */ | |
460b9539 | 55 | struct addrinfo *get_address(const struct stringlist *a, |
56 | const struct addrinfo *pref, | |
57 | char **namep) { | |
58 | struct addrinfo *res; | |
59 | char *name; | |
60 | int rc; | |
e83d0967 RK |
61 | |
62 | switch(a->n) { | |
63 | case 1: | |
460b9539 | 64 | byte_xasprintf(&name, "host * service %s", a->s[0]); |
65 | if((rc = getaddrinfo(0, a->s[0], pref, &res))) { | |
66 | error(0, "getaddrinfo %s: %s", a->s[0], gai_strerror(rc)); | |
67 | return 0; | |
68 | } | |
e83d0967 RK |
69 | break; |
70 | case 2: | |
460b9539 | 71 | byte_xasprintf(&name, "host %s service %s", a->s[0], a->s[1]); |
72 | if((rc = getaddrinfo(a->s[0], a->s[1], pref, &res))) { | |
73 | error(0, "getaddrinfo %s %s: %s", a->s[0], a->s[1], gai_strerror(rc)); | |
74 | return 0; | |
75 | } | |
e83d0967 RK |
76 | break; |
77 | default: | |
78 | error(0, "invalid network address specification (n=%d)", a->n); | |
79 | return 0; | |
460b9539 | 80 | } |
e83d0967 RK |
81 | if(!res || (pref && res->ai_socktype != pref->ai_socktype)) { |
82 | error(0, "getaddrinfo didn't give us a suitable socket address"); | |
460b9539 | 83 | if(res) |
84 | freeaddrinfo(res); | |
85 | return 0; | |
86 | } | |
87 | if(namep) | |
88 | *namep = name; | |
89 | return res; | |
90 | } | |
91 | ||
d7b6f0d1 | 92 | /** @brief Comparison function for address information |
93 | * | |
94 | * Suitable for qsort(). | |
95 | */ | |
460b9539 | 96 | int addrinfocmp(const struct addrinfo *a, |
97 | const struct addrinfo *b) { | |
98 | const struct sockaddr_in *ina, *inb; | |
99 | const struct sockaddr_in6 *in6a, *in6b; | |
100 | ||
101 | if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family; | |
102 | if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype; | |
103 | if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol; | |
136ef3a3 | 104 | switch(a->ai_family) { |
460b9539 | 105 | case PF_INET: |
106 | ina = (const struct sockaddr_in *)a->ai_addr; | |
107 | inb = (const struct sockaddr_in *)b->ai_addr; | |
108 | if(ina->sin_port != inb->sin_port) return ina->sin_port - inb->sin_port; | |
109 | return ina->sin_addr.s_addr - inb->sin_addr.s_addr; | |
110 | break; | |
111 | case PF_INET6: | |
112 | in6a = (const struct sockaddr_in6 *)a->ai_addr; | |
113 | in6b = (const struct sockaddr_in6 *)b->ai_addr; | |
114 | if(in6a->sin6_port != in6b->sin6_port) | |
115 | return in6a->sin6_port - in6b->sin6_port; | |
116 | return memcmp(&in6a->sin6_addr, &in6b->sin6_addr, | |
117 | sizeof (struct in6_addr)); | |
118 | default: | |
119 | error(0, "unsupported protocol family %d", a->ai_protocol); | |
120 | return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */ | |
121 | } | |
122 | } | |
6fba990c | 123 | |
0590cedc | 124 | /** @brief Return nonzero if @p sin4 is an IPv4 multicast address */ |
8d516888 RK |
125 | static inline int multicast4(const struct sockaddr_in *sin4) { |
126 | return IN_MULTICAST(ntohl(sin4->sin_addr.s_addr)); | |
6fba990c RK |
127 | } |
128 | ||
0590cedc | 129 | /** @brief Return nonzero if @p sin6 is an IPv6 multicast address */ |
6fba990c RK |
130 | static inline int multicast6(const struct sockaddr_in6 *sin6) { |
131 | return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr); | |
132 | } | |
133 | ||
134 | /** @brief Return true if @p sa represents a multicast address */ | |
135 | int multicast(const struct sockaddr *sa) { | |
136 | switch(sa->sa_family) { | |
137 | case AF_INET: | |
138 | return multicast4((const struct sockaddr_in *)sa); | |
139 | case AF_INET6: | |
140 | return multicast6((const struct sockaddr_in6 *)sa); | |
141 | default: | |
142 | return 0; | |
143 | } | |
144 | } | |
145 | ||
0590cedc | 146 | /** @brief Format an IPv4 address */ |
8d516888 | 147 | static inline char *format_sockaddr4(const struct sockaddr_in *sin4) { |
6fba990c RK |
148 | char buffer[1024], *r; |
149 | ||
8d516888 | 150 | if(sin4->sin_port) |
6fba990c | 151 | byte_xasprintf(&r, "%s port %u", |
8d516888 | 152 | inet_ntop(sin4->sin_family, &sin4->sin_addr, |
6fba990c | 153 | buffer, sizeof buffer), |
8d516888 | 154 | ntohs(sin4->sin_port)); |
6fba990c RK |
155 | else |
156 | byte_xasprintf(&r, "%s", | |
8d516888 | 157 | inet_ntop(sin4->sin_family, &sin4->sin_addr, |
6fba990c RK |
158 | buffer, sizeof buffer)); |
159 | return r; | |
160 | } | |
161 | ||
0590cedc | 162 | /** @brief Format an IPv6 address */ |
6fba990c RK |
163 | static inline char *format_sockaddr6(const struct sockaddr_in6 *sin6) { |
164 | char buffer[1024], *r; | |
165 | ||
166 | if(sin6->sin6_port) | |
167 | byte_xasprintf(&r, "%s port %u", | |
168 | inet_ntop(sin6->sin6_family, &sin6->sin6_addr, | |
169 | buffer, sizeof buffer), | |
170 | ntohs(sin6->sin6_port)); | |
171 | else | |
172 | byte_xasprintf(&r, "%s", | |
173 | inet_ntop(sin6->sin6_family, &sin6->sin6_addr, | |
174 | buffer, sizeof buffer)); | |
175 | return r; | |
176 | } | |
177 | ||
0590cedc | 178 | /** @brief Format a UNIX socket address */ |
6fba990c RK |
179 | static inline char *format_sockaddrun(const struct sockaddr_un *sun) { |
180 | return xstrdup(sun->sun_path); | |
181 | } | |
182 | ||
0590cedc RK |
183 | /** @brief Construct a text description a sockaddr |
184 | * @param sa Socket address | |
185 | * @return Human-readable form of address | |
186 | */ | |
6fba990c RK |
187 | char *format_sockaddr(const struct sockaddr *sa) { |
188 | switch(sa->sa_family) { | |
189 | case AF_INET: | |
190 | return format_sockaddr4((const struct sockaddr_in *)sa); | |
191 | case AF_INET6: | |
192 | return format_sockaddr6((const struct sockaddr_in6 *)sa); | |
193 | case AF_UNIX: | |
194 | return format_sockaddrun((const struct sockaddr_un *)sa); | |
195 | default: | |
196 | return 0; | |
197 | } | |
198 | } | |
199 | ||
76e72f65 RK |
200 | /** @brief Parse the text form of a network address |
201 | * @param na Where to store result | |
202 | * @param nvec Number of strings | |
203 | * @param vec List of strings | |
204 | * @return 0 on success, -1 on syntax error | |
205 | */ | |
206 | int netaddress_parse(struct netaddress *na, | |
207 | int nvec, | |
208 | char **vec) { | |
209 | const char *port; | |
210 | ||
211 | na->af = AF_UNSPEC; | |
212 | if(nvec > 0 && vec[0][0] == '-') { | |
213 | if(!strcmp(vec[0], "-4")) | |
214 | na->af = AF_INET; | |
215 | else if(!strcmp(vec[0], "-6")) | |
216 | na->af = AF_INET6; | |
217 | else if(!strcmp(vec[0], "-unix")) | |
218 | na->af = AF_UNIX; | |
219 | else if(!strcmp(vec[0], "-")) | |
220 | na->af = AF_UNSPEC; | |
221 | else | |
222 | return -1; | |
223 | --nvec; | |
224 | ++vec; | |
225 | } | |
226 | if(nvec == 0) | |
227 | return -1; | |
228 | /* Possibilities are: | |
229 | * | |
230 | * /path/to/unix/socket an AF_UNIX socket | |
231 | * * PORT any address, specific port | |
232 | * PORT any address, specific port | |
233 | * ADDRESS PORT specific address, specific port | |
234 | */ | |
235 | if(vec[0][0] == '/' && na->af == AF_UNSPEC) | |
236 | na->af = AF_UNIX; | |
237 | if(na->af == AF_UNIX) { | |
238 | if(nvec != 1) | |
239 | return -1; | |
240 | na->address = xstrdup(vec[0]); | |
241 | na->port = -1; /* makes no sense */ | |
242 | } else { | |
243 | switch(nvec) { | |
244 | case 1: | |
245 | na->address = NULL; | |
246 | port = vec[0]; | |
247 | break; | |
248 | case 2: | |
249 | if(!strcmp(vec[0], "*")) | |
250 | na->address = NULL; | |
251 | else | |
252 | na->address = xstrdup(vec[0]); | |
253 | port = vec[1]; | |
254 | break; | |
255 | default: | |
256 | return -1; | |
257 | } | |
258 | if(port[strspn(port, "0123456789")]) | |
259 | return -1; | |
260 | long p; | |
261 | int e = xstrtol(&p, port, NULL, 10); | |
262 | ||
263 | if(e) | |
264 | return -1; | |
265 | if(p > 65535) | |
266 | return -1; | |
267 | na->port = (int)p; | |
268 | } | |
269 | return 0; | |
270 | } | |
271 | ||
272 | /** @brief Format a @ref netaddress structure | |
273 | * @param na Network address to format | |
274 | * @param nvecp Where to put string count, or NULL | |
275 | * @param vecp Where to put strings | |
276 | * | |
277 | * The formatted form is suitable for passing to netaddress_parse(). | |
278 | */ | |
279 | void netaddress_format(const struct netaddress *na, | |
280 | int *nvecp, | |
281 | char ***vecp) { | |
282 | struct vector v[1]; | |
283 | ||
284 | vector_init(v); | |
285 | switch(na->af) { | |
286 | case AF_UNSPEC: vector_append(v, xstrdup("-")); break; | |
287 | case AF_INET: vector_append(v, xstrdup("-4")); break; | |
288 | case AF_INET6: vector_append(v, xstrdup("-6")); break; | |
289 | case AF_UNIX: vector_append(v, xstrdup("-unix")); break; | |
290 | } | |
291 | if(na->address) | |
292 | vector_append(v, xstrdup(na->address)); | |
293 | else | |
294 | vector_append(v, xstrdup("*")); | |
295 | if(na->port != -1) { | |
296 | char buffer[64]; | |
297 | ||
298 | snprintf(buffer, sizeof buffer, "%d", na->port); | |
299 | vector_append(v, xstrdup(buffer)); | |
300 | } | |
301 | vector_terminate(v); | |
302 | if(nvecp) | |
303 | *nvecp = v->nvec; | |
304 | if(vecp) | |
305 | *vecp = v->vec; | |
306 | } | |
307 | ||
308 | /** @brief Resolve a network address | |
309 | * @param na Address structure | |
310 | * @param passive True if passive (bindable) address is desired | |
311 | * @param protocol Protocol number desired (e.g. @c IPPROTO_TCP) | |
312 | * @return List of suitable addresses or NULL | |
313 | */ | |
314 | struct addrinfo *netaddress_resolve(const struct netaddress *na, | |
315 | int passive, | |
316 | int protocol) { | |
317 | struct addrinfo *res, hints[1]; | |
318 | char service[64]; | |
319 | int rc; | |
320 | ||
321 | memset(hints, 0, sizeof hints); | |
322 | hints->ai_family = na->af; | |
323 | hints->ai_protocol = protocol; | |
324 | hints->ai_flags = passive ? AI_PASSIVE : 0; | |
325 | snprintf(service, sizeof service, "%d", na->port); | |
326 | rc = getaddrinfo(na->address, service, hints, &res); | |
327 | if(rc) { | |
328 | error(0, "getaddrinfo %s %d: %s", | |
329 | na->address ? na->address : "*", | |
330 | na->port, gai_strerror(rc)); | |
331 | return NULL; | |
332 | } | |
333 | return res; | |
334 | } | |
335 | ||
460b9539 | 336 | /* |
337 | Local Variables: | |
338 | c-basic-offset:2 | |
339 | comment-column:40 | |
340 | End: | |
341 | */ |