1 /* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Issues to be discussed: 32 * - Thread safe-ness must be checked 33 * - Return values. There seems to be no standard for return value (RFC2133) 34 * but INRIA implementation returns EAI_xxx defined for getaddrinfo(). 35 */ 36 37 #if 0 38 #include <sys/types.h> 39 #include <sys/socket.h> 40 #include <netinet/in.h> 41 #include <arpa/inet.h> 42 #include <arpa/nameser.h> 43 #include <netdb.h> 44 #include <resolv.h> 45 #include <string.h> 46 #include <stddef.h> 47 48 #include "addrinfo.h" 49 #endif 50 51 #define SUCCESS 0 52 #define YES 1 53 #define NO 0 54 55 static struct gni_afd { 56 int a_af; 57 int a_addrlen; 58 int a_socklen; 59 int a_off; 60 } gni_afdl [] = { 61 #ifdef ENABLE_IPV6 62 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), 63 offsetof(struct sockaddr_in6, sin6_addr)}, 64 #endif 65 {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), 66 offsetof(struct sockaddr_in, sin_addr)}, 67 {0, 0, 0}, 68 }; 69 70 struct gni_sockinet { 71 u_char si_len; 72 u_char si_family; 73 u_short si_port; 74 }; 75 76 #define ENI_NOSOCKET 0 77 #define ENI_NOSERVNAME 1 78 #define ENI_NOHOSTNAME 2 79 #define ENI_MEMORY 3 80 #define ENI_SYSTEM 4 81 #define ENI_FAMILY 5 82 #define ENI_SALEN 6 83 84 /* forward declaration to make gcc happy */ 85 int getnameinfo Py_PROTO((const struct sockaddr *, size_t, char *, size_t, 86 char *, size_t, int)); 87 88 int 89 getnameinfo(sa, salen, host, hostlen, serv, servlen, flags) 90 const struct sockaddr *sa; 91 size_t salen; 92 char *host; 93 size_t hostlen; 94 char *serv; 95 size_t servlen; 96 int flags; 97 { 98 struct gni_afd *gni_afd; 99 struct servent *sp; 100 struct hostent *hp; 101 u_short port; 102 int family, len, i; 103 char *addr, *p; 104 u_long v4a; 105 #ifdef ENABLE_IPV6 106 u_char pfx; 107 #endif 108 int h_error; 109 char numserv[512]; 110 char numaddr[512]; 111 112 if (sa == NULL) 113 return ENI_NOSOCKET; 114 115 #ifdef HAVE_SOCKADDR_SA_LEN 116 len = sa->sa_len; 117 if (len != salen) return ENI_SALEN; 118 #else 119 len = salen; 120 #endif 121 122 family = sa->sa_family; 123 for (i = 0; gni_afdl[i].a_af; i++) 124 if (gni_afdl[i].a_af == family) { 125 gni_afd = &gni_afdl[i]; 126 goto found; 127 } 128 return ENI_FAMILY; 129 130 found: 131 if (len != gni_afd->a_socklen) return ENI_SALEN; 132 133 port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */ 134 addr = (char *)sa + gni_afd->a_off; 135 136 if (serv == NULL || servlen == 0) { 137 /* what we should do? */ 138 } else if (flags & NI_NUMERICSERV) { 139 sprintf(numserv, "%d", ntohs(port)); 140 if (strlen(numserv) > servlen) 141 return ENI_MEMORY; 142 strcpy(serv, numserv); 143 } else { 144 sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp"); 145 if (sp) { 146 if (strlen(sp->s_name) > servlen) 147 return ENI_MEMORY; 148 strcpy(serv, sp->s_name); 149 } else 150 return ENI_NOSERVNAME; 151 } 152 153 switch (sa->sa_family) { 154 case AF_INET: 155 v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 156 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a)) 157 flags |= NI_NUMERICHOST; 158 v4a >>= IN_CLASSA_NSHIFT; 159 if (v4a == 0 || v4a == IN_LOOPBACKNET) 160 flags |= NI_NUMERICHOST; 161 break; 162 #ifdef ENABLE_IPV6 163 case AF_INET6: 164 pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0]; 165 if (pfx == 0 || pfx == 0xfe || pfx == 0xff) 166 flags |= NI_NUMERICHOST; 167 break; 168 #endif 169 } 170 if (host == NULL || hostlen == 0) { 171 /* what should we do? */ 172 } else if (flags & NI_NUMERICHOST) { 173 if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) 174 == NULL) 175 return ENI_SYSTEM; 176 if (strlen(numaddr) > hostlen) 177 return ENI_MEMORY; 178 strcpy(host, numaddr); 179 } else { 180 #ifdef ENABLE_IPV6 181 hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error); 182 #else 183 hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af); 184 h_error = h_errno; 185 #endif 186 187 if (hp) { 188 if (flags & NI_NOFQDN) { 189 p = strchr(hp->h_name, '.'); 190 if (p) *p = '\0'; 191 } 192 if (strlen(hp->h_name) > hostlen) { 193 #ifdef ENABLE_IPV6 194 freehostent(hp); 195 #endif 196 return ENI_MEMORY; 197 } 198 strcpy(host, hp->h_name); 199 #ifdef ENABLE_IPV6 200 freehostent(hp); 201 #endif 202 } else { 203 if (flags & NI_NAMEREQD) 204 return ENI_NOHOSTNAME; 205 if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr)) 206 == NULL) 207 return ENI_NOHOSTNAME; 208 if (strlen(numaddr) > hostlen) 209 return ENI_MEMORY; 210 strcpy(host, numaddr); 211 } 212 } 213 return SUCCESS; 214 } 215
