| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2007 Richard Kettlewell |
| 4 | * |
| 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. |
| 9 | * |
| 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. |
| 14 | * |
| 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 |
| 18 | * USA |
| 19 | */ |
| 20 | /** @file lib/addr.c |
| 21 | * @brief Socket address support */ |
| 22 | |
| 23 | #include <config.h> |
| 24 | #include "types.h" |
| 25 | |
| 26 | #include <stdio.h> |
| 27 | #include <string.h> |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <netinet/in.h> |
| 31 | #include <netdb.h> |
| 32 | #include <arpa/inet.h> |
| 33 | #include <sys/un.h> |
| 34 | |
| 35 | #include "log.h" |
| 36 | #include "printf.h" |
| 37 | #include "configuration.h" |
| 38 | #include "addr.h" |
| 39 | #include "mem.h" |
| 40 | |
| 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 |
| 46 | * |
| 47 | * This converts one or two strings into an address specification suitable |
| 48 | * for passing to socket(), bind() etc. |
| 49 | * |
| 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. |
| 53 | * |
| 54 | * @p namep is used to return a description of the address suitable |
| 55 | * for use in log messages. |
| 56 | * |
| 57 | * If an error occurs a message is logged and a null pointer returned. |
| 58 | */ |
| 59 | struct addrinfo *get_address(const struct stringlist *a, |
| 60 | const struct addrinfo *pref, |
| 61 | char **namep) { |
| 62 | struct addrinfo *res; |
| 63 | char *name; |
| 64 | int rc; |
| 65 | |
| 66 | switch(a->n) { |
| 67 | case 1: |
| 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)); |
| 71 | return 0; |
| 72 | } |
| 73 | break; |
| 74 | case 2: |
| 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)); |
| 78 | return 0; |
| 79 | } |
| 80 | break; |
| 81 | default: |
| 82 | error(0, "invalid network address specification (n=%d)", a->n); |
| 83 | return 0; |
| 84 | } |
| 85 | if(!res || (pref && res->ai_socktype != pref->ai_socktype)) { |
| 86 | error(0, "getaddrinfo didn't give us a suitable socket address"); |
| 87 | if(res) |
| 88 | freeaddrinfo(res); |
| 89 | return 0; |
| 90 | } |
| 91 | if(namep) |
| 92 | *namep = name; |
| 93 | return res; |
| 94 | } |
| 95 | |
| 96 | /** @brief Comparison function for address information |
| 97 | * |
| 98 | * Suitable for qsort(). |
| 99 | */ |
| 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; |
| 104 | |
| 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_protocol) { |
| 109 | case PF_INET: |
| 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; |
| 114 | break; |
| 115 | case PF_INET6: |
| 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)); |
| 122 | default: |
| 123 | error(0, "unsupported protocol family %d", a->ai_protocol); |
| 124 | return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */ |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | static inline int multicast4(const struct sockaddr_in *sin4) { |
| 129 | return IN_MULTICAST(ntohl(sin4->sin_addr.s_addr)); |
| 130 | } |
| 131 | |
| 132 | static inline int multicast6(const struct sockaddr_in6 *sin6) { |
| 133 | return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr); |
| 134 | } |
| 135 | |
| 136 | /** @brief Return true if @p sa represents a multicast address */ |
| 137 | int multicast(const struct sockaddr *sa) { |
| 138 | switch(sa->sa_family) { |
| 139 | case AF_INET: |
| 140 | return multicast4((const struct sockaddr_in *)sa); |
| 141 | case AF_INET6: |
| 142 | return multicast6((const struct sockaddr_in6 *)sa); |
| 143 | default: |
| 144 | return 0; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | static inline char *format_sockaddr4(const struct sockaddr_in *sin4) { |
| 149 | char buffer[1024], *r; |
| 150 | |
| 151 | if(sin4->sin_port) |
| 152 | byte_xasprintf(&r, "%s port %u", |
| 153 | inet_ntop(sin4->sin_family, &sin4->sin_addr, |
| 154 | buffer, sizeof buffer), |
| 155 | ntohs(sin4->sin_port)); |
| 156 | else |
| 157 | byte_xasprintf(&r, "%s", |
| 158 | inet_ntop(sin4->sin_family, &sin4->sin_addr, |
| 159 | buffer, sizeof buffer)); |
| 160 | return r; |
| 161 | } |
| 162 | |
| 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 | |
| 178 | static inline char *format_sockaddrun(const struct sockaddr_un *sun) { |
| 179 | return xstrdup(sun->sun_path); |
| 180 | } |
| 181 | |
| 182 | /** @brief Construct a text description a sockaddr */ |
| 183 | char *format_sockaddr(const struct sockaddr *sa) { |
| 184 | switch(sa->sa_family) { |
| 185 | case AF_INET: |
| 186 | return format_sockaddr4((const struct sockaddr_in *)sa); |
| 187 | case AF_INET6: |
| 188 | return format_sockaddr6((const struct sockaddr_in6 *)sa); |
| 189 | case AF_UNIX: |
| 190 | return format_sockaddrun((const struct sockaddr_un *)sa); |
| 191 | default: |
| 192 | return 0; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | Local Variables: |
| 198 | c-basic-offset:2 |
| 199 | comment-column:40 |
| 200 | End: |
| 201 | */ |