2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2007, 2008 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 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * 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, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * @brief Socket address support */
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
32 #include <arpa/inet.h>
37 #include "configuration.h"
41 /** @brief Convert a pair of strings to an address
42 * @param a Pointer to string list
43 * @param pref Hints structure for getaddrinfo, or NULL
44 * @param namep Where to store address description, or NULL
45 * @return Address info structure or NULL on error
47 * This converts one or two strings into an address specification suitable
48 * for passing to socket(), bind() etc.
50 * If there is only one string then it is assumed to be the service
51 * name (port number). If there are two then the first is the host
52 * name and the second the service name.
54 * @p namep is used to return a description of the address suitable
55 * for use in log messages.
57 * If an error occurs a message is logged and a null pointer returned.
59 struct addrinfo *get_address(const struct stringlist *a,
60 const struct addrinfo *pref,
68 byte_xasprintf(&name, "host * service %s", a->s[0]);
69 if((rc = getaddrinfo(0, a->s[0], pref, &res))) {
70 error(0, "getaddrinfo %s: %s", a->s[0], gai_strerror(rc));
75 byte_xasprintf(&name, "host %s service %s", a->s[0], a->s[1]);
76 if((rc = getaddrinfo(a->s[0], a->s[1], pref, &res))) {
77 error(0, "getaddrinfo %s %s: %s", a->s[0], a->s[1], gai_strerror(rc));
82 error(0, "invalid network address specification (n=%d)", a->n);
85 if(!res || (pref && res->ai_socktype != pref->ai_socktype)) {
86 error(0, "getaddrinfo didn't give us a suitable socket address");
96 /** @brief Comparison function for address information
98 * Suitable for qsort().
100 int addrinfocmp(const struct addrinfo *a,
101 const struct addrinfo *b) {
102 const struct sockaddr_in *ina, *inb;
103 const struct sockaddr_in6 *in6a, *in6b;
105 if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family;
106 if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype;
107 if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol;
108 switch(a->ai_family) {
110 ina = (const struct sockaddr_in *)a->ai_addr;
111 inb = (const struct sockaddr_in *)b->ai_addr;
112 if(ina->sin_port != inb->sin_port) return ina->sin_port - inb->sin_port;
113 return ina->sin_addr.s_addr - inb->sin_addr.s_addr;
116 in6a = (const struct sockaddr_in6 *)a->ai_addr;
117 in6b = (const struct sockaddr_in6 *)b->ai_addr;
118 if(in6a->sin6_port != in6b->sin6_port)
119 return in6a->sin6_port - in6b->sin6_port;
120 return memcmp(&in6a->sin6_addr, &in6b->sin6_addr,
121 sizeof (struct in6_addr));
123 error(0, "unsupported protocol family %d", a->ai_protocol);
124 return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */
128 /** @brief Return nonzero if @p sin4 is an IPv4 multicast address */
129 static inline int multicast4(const struct sockaddr_in *sin4) {
130 return IN_MULTICAST(ntohl(sin4->sin_addr.s_addr));
133 /** @brief Return nonzero if @p sin6 is an IPv6 multicast address */
134 static inline int multicast6(const struct sockaddr_in6 *sin6) {
135 return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr);
138 /** @brief Return true if @p sa represents a multicast address */
139 int multicast(const struct sockaddr *sa) {
140 switch(sa->sa_family) {
142 return multicast4((const struct sockaddr_in *)sa);
144 return multicast6((const struct sockaddr_in6 *)sa);
150 /** @brief Format an IPv4 address */
151 static inline char *format_sockaddr4(const struct sockaddr_in *sin4) {
152 char buffer[1024], *r;
155 byte_xasprintf(&r, "%s port %u",
156 inet_ntop(sin4->sin_family, &sin4->sin_addr,
157 buffer, sizeof buffer),
158 ntohs(sin4->sin_port));
160 byte_xasprintf(&r, "%s",
161 inet_ntop(sin4->sin_family, &sin4->sin_addr,
162 buffer, sizeof buffer));
166 /** @brief Format an IPv6 address */
167 static inline char *format_sockaddr6(const struct sockaddr_in6 *sin6) {
168 char buffer[1024], *r;
171 byte_xasprintf(&r, "%s port %u",
172 inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
173 buffer, sizeof buffer),
174 ntohs(sin6->sin6_port));
176 byte_xasprintf(&r, "%s",
177 inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
178 buffer, sizeof buffer));
182 /** @brief Format a UNIX socket address */
183 static inline char *format_sockaddrun(const struct sockaddr_un *sun) {
184 return xstrdup(sun->sun_path);
187 /** @brief Construct a text description a sockaddr
188 * @param sa Socket address
189 * @return Human-readable form of address
191 char *format_sockaddr(const struct sockaddr *sa) {
192 switch(sa->sa_family) {
194 return format_sockaddr4((const struct sockaddr_in *)sa);
196 return format_sockaddr6((const struct sockaddr_in6 *)sa);
198 return format_sockaddrun((const struct sockaddr_un *)sa);