2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2007, 2008, 2013 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 * @brief Socket address support */
23 #include <sys/types.h>
25 # include <sys/socket.h>
28 # include <netinet/in.h>
31 # include <arpa/inet.h>
42 #include "configuration.h"
45 /** @brief Convert a pair of strings to an address
46 * @param a Pointer to string list
47 * @param pref Hints structure for getaddrinfo, or NULL
48 * @param namep Where to store address description, or NULL
49 * @return Address info structure or NULL on error
51 * This converts one or two strings into an address specification suitable
52 * for passing to socket(), bind() etc.
54 * If there is only one string then it is assumed to be the service
55 * name (port number). If there are two then the first is the host
56 * name and the second the service name.
58 * @p namep is used to return a description of the address suitable
59 * for use in log messages.
61 * If an error occurs a message is logged and a null pointer returned.
63 struct addrinfo *get_address(const struct stringlist *a,
64 const struct addrinfo *pref,
72 byte_xasprintf(&name, "host * service %s", a->s[0]);
73 if((rc = getaddrinfo(0, a->s[0], pref, &res))) {
74 disorder_error(0, "getaddrinfo %s: %s", a->s[0], gai_strerror(rc));
79 byte_xasprintf(&name, "host %s service %s", a->s[0], a->s[1]);
80 if((rc = getaddrinfo(a->s[0], a->s[1], pref, &res))) {
81 disorder_error(0, "getaddrinfo %s %s: %s",
82 a->s[0], a->s[1], gai_strerror(rc));
87 disorder_error(0, "invalid network address specification (n=%d)", a->n);
90 if(!res || (pref && res->ai_socktype != pref->ai_socktype)) {
91 disorder_error(0, "getaddrinfo didn't give us a suitable socket address");
101 /** @brief Comparison function for address information
103 * Suitable for qsort().
105 int addrinfocmp(const struct addrinfo *a,
106 const struct addrinfo *b) {
107 if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family;
108 if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype;
109 if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol;
110 return sockaddrcmp(a->ai_addr, b->ai_addr);
113 /** @brief Comparison function for socket addresses
115 * Suitable for qsort().
117 int sockaddrcmp(const struct sockaddr *a,
118 const struct sockaddr *b) {
119 const struct sockaddr_in *ina, *inb;
120 const struct sockaddr_in6 *in6a, *in6b;
122 if(a->sa_family != b->sa_family) return a->sa_family - b->sa_family;
123 switch(a->sa_family) {
125 ina = (const struct sockaddr_in *)a;
126 inb = (const struct sockaddr_in *)b;
127 if(ina->sin_port != inb->sin_port) return ina->sin_port - inb->sin_port;
128 return ina->sin_addr.s_addr - inb->sin_addr.s_addr;
131 in6a = (const struct sockaddr_in6 *)a;
132 in6b = (const struct sockaddr_in6 *)b;
133 if(in6a->sin6_port != in6b->sin6_port)
134 return in6a->sin6_port - in6b->sin6_port;
135 return memcmp(&in6a->sin6_addr, &in6b->sin6_addr,
136 sizeof (struct in6_addr));
138 disorder_fatal(0, "unsupported protocol family %d", a->sa_family);
142 /** @brief Return nonzero if @p sin4 is an IPv4 multicast address */
143 static inline int multicast4(const struct sockaddr_in *sin4) {
144 return IN_MULTICAST(ntohl(sin4->sin_addr.s_addr));
147 /** @brief Return nonzero if @p sin6 is an IPv6 multicast address */
148 static inline int multicast6(const struct sockaddr_in6 *sin6) {
149 return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr);
152 /** @brief Return true if @p sa represents a multicast address */
153 int multicast(const struct sockaddr *sa) {
154 switch(sa->sa_family) {
156 return multicast4((const struct sockaddr_in *)sa);
158 return multicast6((const struct sockaddr_in6 *)sa);
164 /** @brief Format an IPv4 address */
165 static inline char *format_sockaddr4(const struct sockaddr_in *sin4) {
166 char buffer[1024], *r;
169 byte_xasprintf(&r, "%s port %u",
170 inet_ntop(sin4->sin_family, &sin4->sin_addr,
171 buffer, sizeof buffer),
172 ntohs(sin4->sin_port));
174 byte_xasprintf(&r, "%s",
175 inet_ntop(sin4->sin_family, &sin4->sin_addr,
176 buffer, sizeof buffer));
180 /** @brief Format an IPv6 address */
181 static inline char *format_sockaddr6(const struct sockaddr_in6 *sin6) {
182 char buffer[1024], *r;
185 byte_xasprintf(&r, "%s port %u",
186 inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
187 buffer, sizeof buffer),
188 ntohs(sin6->sin6_port));
190 byte_xasprintf(&r, "%s",
191 inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
192 buffer, sizeof buffer));
197 /** @brief Format a UNIX socket address */
198 static inline char *format_sockaddrun(const struct sockaddr_un *sun) {
199 return xstrdup(sun->sun_path);
203 /** @brief Construct a text description a sockaddr
204 * @param sa Socket address
205 * @return Human-readable form of address
207 char *format_sockaddr(const struct sockaddr *sa) {
208 switch(sa->sa_family) {
210 return format_sockaddr4((const struct sockaddr_in *)sa);
212 return format_sockaddr6((const struct sockaddr_in6 *)sa);
215 return format_sockaddrun((const struct sockaddr_un *)sa);
222 /** @brief Parse the text form of a network address
223 * @param na Where to store result
224 * @param nvec Number of strings
225 * @param vec List of strings
226 * @return 0 on success, -1 on syntax error
228 int netaddress_parse(struct netaddress *na,
234 if(nvec > 0 && vec[0][0] == '-') {
235 if(!strcmp(vec[0], "-4"))
237 else if(!strcmp(vec[0], "-6"))
239 else if(!strcmp(vec[0], "-unix"))
241 else if(!strcmp(vec[0], "-"))
250 /* Possibilities are:
252 * /path/to/unix/socket an AF_UNIX socket
253 * * PORT any address, specific port
254 * PORT any address, specific port
255 * ADDRESS PORT specific address, specific port
257 if(vec[0][0] == '/' && na->af == AF_UNSPEC)
259 if(na->af == AF_UNIX) {
262 na->address = xstrdup(vec[0]);
263 na->port = -1; /* makes no sense */
271 if(!strcmp(vec[0], "*"))
274 na->address = xstrdup(vec[0]);
280 if(port[strspn(port, "0123456789")])
283 int e = xstrtol(&p, port, NULL, 10);
294 /** @brief Format a @ref netaddress structure
295 * @param na Network address to format
296 * @param nvecp Where to put string count, or NULL
297 * @param vecp Where to put strings
299 * The formatted form is suitable for passing to netaddress_parse().
301 void netaddress_format(const struct netaddress *na,
308 case AF_UNSPEC: vector_append(v, xstrdup("-")); break;
309 case AF_INET: vector_append(v, xstrdup("-4")); break;
310 case AF_INET6: vector_append(v, xstrdup("-6")); break;
311 case AF_UNIX: vector_append(v, xstrdup("-unix")); break;
314 vector_append(v, xstrdup(na->address));
316 vector_append(v, xstrdup("*"));
320 snprintf(buffer, sizeof buffer, "%d", na->port);
321 vector_append(v, xstrdup(buffer));
330 /** @brief Resolve a network address
331 * @param na Address structure
332 * @param passive True if passive (bindable) address is desired
333 * @param protocol Protocol number desired (e.g. @c IPPROTO_TCP)
334 * @return List of suitable addresses or NULL
336 struct addrinfo *netaddress_resolve(const struct netaddress *na,
339 struct addrinfo *res, hints[1];
343 memset(hints, 0, sizeof hints);
344 hints->ai_family = na->af;
345 hints->ai_protocol = protocol;
346 hints->ai_flags = passive ? AI_PASSIVE : 0;
347 snprintf(service, sizeof service, "%d", na->port);
348 rc = getaddrinfo(na->address, service, hints, &res);
350 disorder_error(0, "getaddrinfo %s %d: %s",
351 na->address ? na->address : "*",
352 na->port, gai_strerror(rc));