2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2007 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
20 /** @file lib/addr.c Socket address support */
27 #include <sys/types.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
31 #include <arpa/inet.h>
36 #include "configuration.h"
40 /** @brief Convert a pair of strings to an address
41 * @param a Pointer to string list
42 * @param pref Hints structure for getaddrinfo, or NULL
43 * @param namep Where to store address description, or NULL
44 * @return Address info structure or NULL on error
46 * This converts one or two strings into an address specification suitable
47 * for passing to socket(), bind() etc.
49 * If there is only one string then it is assumed to be the service
50 * name (port number). If there are two then the first is the host
51 * name and the second the service name.
53 * @p namep is used to return a description of the address suitable
54 * for use in log messages.
56 * If an error occurs a message is logged and a null pointer returned.
58 struct addrinfo
*get_address(const struct stringlist
*a
,
59 const struct addrinfo
*pref
,
67 byte_xasprintf(&name
, "host * service %s", a
->s
[0]);
68 if((rc
= getaddrinfo(0, a
->s
[0], pref
, &res
))) {
69 error(0, "getaddrinfo %s: %s", a
->s
[0], gai_strerror(rc
));
74 byte_xasprintf(&name
, "host %s service %s", a
->s
[0], a
->s
[1]);
75 if((rc
= getaddrinfo(a
->s
[0], a
->s
[1], pref
, &res
))) {
76 error(0, "getaddrinfo %s %s: %s", a
->s
[0], a
->s
[1], gai_strerror(rc
));
81 error(0, "invalid network address specification (n=%d)", a
->n
);
84 if(!res
|| (pref
&& res
->ai_socktype
!= pref
->ai_socktype
)) {
85 error(0, "getaddrinfo didn't give us a suitable socket address");
95 /** @brief Comparison function for address information
97 * Suitable for qsort().
99 int addrinfocmp(const struct addrinfo
*a
,
100 const struct addrinfo
*b
) {
101 const struct sockaddr_in
*ina
, *inb
;
102 const struct sockaddr_in6
*in6a
, *in6b
;
104 if(a
->ai_family
!= b
->ai_family
) return a
->ai_family
- b
->ai_family
;
105 if(a
->ai_socktype
!= b
->ai_socktype
) return a
->ai_socktype
- b
->ai_socktype
;
106 if(a
->ai_protocol
!= b
->ai_protocol
) return a
->ai_protocol
- b
->ai_protocol
;
107 switch(a
->ai_protocol
) {
109 ina
= (const struct sockaddr_in
*)a
->ai_addr
;
110 inb
= (const struct sockaddr_in
*)b
->ai_addr
;
111 if(ina
->sin_port
!= inb
->sin_port
) return ina
->sin_port
- inb
->sin_port
;
112 return ina
->sin_addr
.s_addr
- inb
->sin_addr
.s_addr
;
115 in6a
= (const struct sockaddr_in6
*)a
->ai_addr
;
116 in6b
= (const struct sockaddr_in6
*)b
->ai_addr
;
117 if(in6a
->sin6_port
!= in6b
->sin6_port
)
118 return in6a
->sin6_port
- in6b
->sin6_port
;
119 return memcmp(&in6a
->sin6_addr
, &in6b
->sin6_addr
,
120 sizeof (struct in6_addr
));
122 error(0, "unsupported protocol family %d", a
->ai_protocol
);
123 return memcmp(a
->ai_addr
, b
->ai_addr
, a
->ai_addrlen
); /* kludge */
127 static inline int multicast4(const struct sockaddr_in
*sin
) {
128 return IN_MULTICAST(ntohl(sin
->sin_addr
.s_addr
));
131 static inline int multicast6(const struct sockaddr_in6
*sin6
) {
132 return IN6_IS_ADDR_MULTICAST(&sin6
->sin6_addr
);
135 /** @brief Return true if @p sa represents a multicast address */
136 int multicast(const struct sockaddr
*sa
) {
137 switch(sa
->sa_family
) {
139 return multicast4((const struct sockaddr_in
*)sa
);
141 return multicast6((const struct sockaddr_in6
*)sa
);
147 static inline char *format_sockaddr4(const struct sockaddr_in
*sin
) {
148 char buffer
[1024], *r
;
151 byte_xasprintf(&r
, "%s port %u",
152 inet_ntop(sin
->sin_family
, &sin
->sin_addr
,
153 buffer
, sizeof buffer
),
154 ntohs(sin
->sin_port
));
156 byte_xasprintf(&r
, "%s",
157 inet_ntop(sin
->sin_family
, &sin
->sin_addr
,
158 buffer
, sizeof buffer
));
162 static inline char *format_sockaddr6(const struct sockaddr_in6
*sin6
) {
163 char buffer
[1024], *r
;
166 byte_xasprintf(&r
, "%s port %u",
167 inet_ntop(sin6
->sin6_family
, &sin6
->sin6_addr
,
168 buffer
, sizeof buffer
),
169 ntohs(sin6
->sin6_port
));
171 byte_xasprintf(&r
, "%s",
172 inet_ntop(sin6
->sin6_family
, &sin6
->sin6_addr
,
173 buffer
, sizeof buffer
));
177 static inline char *format_sockaddrun(const struct sockaddr_un
*sun
) {
178 return xstrdup(sun
->sun_path
);
181 /** @brief Construct a text description a sockaddr */
182 char *format_sockaddr(const struct sockaddr
*sa
) {
183 switch(sa
->sa_family
) {
185 return format_sockaddr4((const struct sockaddr_in
*)sa
);
187 return format_sockaddr6((const struct sockaddr_in6
*)sa
);
189 return format_sockaddrun((const struct sockaddr_un
*)sa
);