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 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>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
34 /** @brief Convert a pair of strings to an address
35 * @param a Pointer to string list
36 * @param pref Hints structure for getaddrinfo, or NULL
37 * @param namep Where to store address description, or NULL
38 * @return Address info structure or NULL on error
40 * This converts one or two strings into an address specification suitable
41 * for passing to socket(), bind() etc.
43 * If there is only one string then it is assumed to be the service
44 * name (port number). If there are two then the first is the host
45 * name and the second the service name.
47 * @p namep is used to return a description of the address suitable
48 * for use in log messages.
50 * If an error occurs a message is logged and a null pointer returned.
52 struct addrinfo
*get_address(const struct stringlist
*a
,
53 const struct addrinfo
*pref
,
61 byte_xasprintf(&name
, "host * service %s", a
->s
[0]);
62 if((rc
= getaddrinfo(0, a
->s
[0], pref
, &res
))) {
63 error(0, "getaddrinfo %s: %s", a
->s
[0], gai_strerror(rc
));
68 byte_xasprintf(&name
, "host %s service %s", a
->s
[0], a
->s
[1]);
69 if((rc
= getaddrinfo(a
->s
[0], a
->s
[1], pref
, &res
))) {
70 error(0, "getaddrinfo %s %s: %s", a
->s
[0], a
->s
[1], gai_strerror(rc
));
75 error(0, "invalid network address specification (n=%d)", a
->n
);
78 if(!res
|| (pref
&& res
->ai_socktype
!= pref
->ai_socktype
)) {
79 error(0, "getaddrinfo didn't give us a suitable socket address");
89 /** @brief Comparison function for address information
91 * Suitable for qsort().
93 int addrinfocmp(const struct addrinfo
*a
,
94 const struct addrinfo
*b
) {
95 const struct sockaddr_in
*ina
, *inb
;
96 const struct sockaddr_in6
*in6a
, *in6b
;
98 if(a
->ai_family
!= b
->ai_family
) return a
->ai_family
- b
->ai_family
;
99 if(a
->ai_socktype
!= b
->ai_socktype
) return a
->ai_socktype
- b
->ai_socktype
;
100 if(a
->ai_protocol
!= b
->ai_protocol
) return a
->ai_protocol
- b
->ai_protocol
;
101 switch(a
->ai_family
) {
103 ina
= (const struct sockaddr_in
*)a
->ai_addr
;
104 inb
= (const struct sockaddr_in
*)b
->ai_addr
;
105 if(ina
->sin_port
!= inb
->sin_port
) return ina
->sin_port
- inb
->sin_port
;
106 return ina
->sin_addr
.s_addr
- inb
->sin_addr
.s_addr
;
109 in6a
= (const struct sockaddr_in6
*)a
->ai_addr
;
110 in6b
= (const struct sockaddr_in6
*)b
->ai_addr
;
111 if(in6a
->sin6_port
!= in6b
->sin6_port
)
112 return in6a
->sin6_port
- in6b
->sin6_port
;
113 return memcmp(&in6a
->sin6_addr
, &in6b
->sin6_addr
,
114 sizeof (struct in6_addr
));
116 error(0, "unsupported protocol family %d", a
->ai_protocol
);
117 return memcmp(a
->ai_addr
, b
->ai_addr
, a
->ai_addrlen
); /* kludge */
121 /** @brief Return nonzero if @p sin4 is an IPv4 multicast address */
122 static inline int multicast4(const struct sockaddr_in
*sin4
) {
123 return IN_MULTICAST(ntohl(sin4
->sin_addr
.s_addr
));
126 /** @brief Return nonzero if @p sin6 is an IPv6 multicast address */
127 static inline int multicast6(const struct sockaddr_in6
*sin6
) {
128 return IN6_IS_ADDR_MULTICAST(&sin6
->sin6_addr
);
131 /** @brief Return true if @p sa represents a multicast address */
132 int multicast(const struct sockaddr
*sa
) {
133 switch(sa
->sa_family
) {
135 return multicast4((const struct sockaddr_in
*)sa
);
137 return multicast6((const struct sockaddr_in6
*)sa
);
143 /** @brief Format an IPv4 address */
144 static inline char *format_sockaddr4(const struct sockaddr_in
*sin4
) {
145 char buffer
[1024], *r
;
148 byte_xasprintf(&r
, "%s port %u",
149 inet_ntop(sin4
->sin_family
, &sin4
->sin_addr
,
150 buffer
, sizeof buffer
),
151 ntohs(sin4
->sin_port
));
153 byte_xasprintf(&r
, "%s",
154 inet_ntop(sin4
->sin_family
, &sin4
->sin_addr
,
155 buffer
, sizeof buffer
));
159 /** @brief Format an IPv6 address */
160 static inline char *format_sockaddr6(const struct sockaddr_in6
*sin6
) {
161 char buffer
[1024], *r
;
164 byte_xasprintf(&r
, "%s port %u",
165 inet_ntop(sin6
->sin6_family
, &sin6
->sin6_addr
,
166 buffer
, sizeof buffer
),
167 ntohs(sin6
->sin6_port
));
169 byte_xasprintf(&r
, "%s",
170 inet_ntop(sin6
->sin6_family
, &sin6
->sin6_addr
,
171 buffer
, sizeof buffer
));
175 /** @brief Format a UNIX socket address */
176 static inline char *format_sockaddrun(const struct sockaddr_un
*sun
) {
177 return xstrdup(sun
->sun_path
);
180 /** @brief Construct a text description a sockaddr
181 * @param sa Socket address
182 * @return Human-readable form of address
184 char *format_sockaddr(const struct sockaddr
*sa
) {
185 switch(sa
->sa_family
) {
187 return format_sockaddr4((const struct sockaddr_in
*)sa
);
189 return format_sockaddr6((const struct sockaddr_in6
*)sa
);
191 return format_sockaddrun((const struct sockaddr_un
*)sa
);