508 lines
12 KiB
C
508 lines
12 KiB
C
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/* $NetBSD: getaddrinfo.c,v 1.1.1.1 1999/11/20 18:54:08 veego Exp $ */
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/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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* The Berkeley Software Design Inc. software License Agreement specifies
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* the terms and conditions for redistribution.
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*
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* BSDI Id: getaddrinfo.c,v 8.3 1999/06/11 01:25:58 vixie Exp
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*/
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#include <port_before.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include <arpa/inet.h>
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#include <port_after.h>
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#define SA(addr) ((struct sockaddr *)(addr))
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#define SIN(addr) ((struct sockaddr_in *)(addr))
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#define SIN6(addr) ((struct sockaddr_in6 *)(addr))
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#define SUN(addr) ((struct sockaddr_un *)(addr))
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static struct addrinfo
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*ai_reverse(struct addrinfo *oai),
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*ai_clone(struct addrinfo *oai, int family),
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*ai_alloc(int family, int addrlen);
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#ifdef AF_LOCAL
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static int get_local(const char *name, int socktype, struct addrinfo **res);
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#endif
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static int add_ipv4(const char *hostname, int flags, struct addrinfo **aip,
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int socktype, int port);
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static int add_ipv6(const char *hostname, int flags, struct addrinfo **aip,
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int socktype, int port);
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static void set_order(int, int (**)());
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#define FOUND_IPV4 0x1
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#define FOUND_IPV6 0x2
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#define FOUND_MAX 2
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int
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getaddrinfo(const char *hostname, const char *servname,
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const struct addrinfo *hints, struct addrinfo **res)
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{
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struct servent *sp;
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char *proto;
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int family, socktype, flags, protocol;
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struct addrinfo *ai, *ai_list;
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int port, err, i;
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int (*net_order[FOUND_MAX+1])();
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if (hostname == NULL && servname == NULL)
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return (EAI_NONAME);
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proto = NULL;
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if (hints != NULL) {
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if (hints->ai_flags & ~(AI_MASK))
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return (EAI_BADFLAGS);
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if (hints->ai_addrlen || hints->ai_canonname ||
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hints->ai_addr || hints->ai_next) {
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errno = EINVAL;
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return (EAI_SYSTEM);
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}
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family = hints->ai_family;
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socktype = hints->ai_socktype;
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protocol = hints->ai_protocol;
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flags = hints->ai_flags;
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switch (family) {
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case AF_UNSPEC:
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switch (hints->ai_socktype) {
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case SOCK_STREAM: proto = "tcp"; break;
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case SOCK_DGRAM: proto = "udp"; break;
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}
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break;
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case AF_INET:
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case AF_INET6:
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switch (hints->ai_socktype) {
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case 0: break;
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case SOCK_STREAM: proto = "tcp"; break;
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case SOCK_DGRAM: proto = "udp"; break;
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case SOCK_RAW: break;
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default: return (EAI_SOCKTYPE);
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}
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break;
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#ifdef AF_LOCAL
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case AF_LOCAL:
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switch (hints->ai_socktype) {
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case 0: break;
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case SOCK_STREAM: break;
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case SOCK_DGRAM: break;
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default: return (EAI_SOCKTYPE);
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}
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break;
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#endif
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default:
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return (EAI_FAMILY);
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}
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} else {
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protocol = 0;
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family = 0;
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socktype = 0;
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flags = 0;
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}
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#ifdef AF_LOCAL
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/*
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* First, deal with AF_LOCAL. If the family was not set,
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* then assume AF_LOCAL if the first character of the
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* hostname/servname is '/'.
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*/
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if (hostname &&
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(family == AF_LOCAL || (family == 0 && *hostname == '/')))
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return (get_local(hostname, socktype, res));
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if (servname &&
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(family == AF_LOCAL || (family == 0 && *servname == '/')))
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return (get_local(servname, socktype, res));
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#endif
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/*
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* Ok, only AF_INET and AF_INET6 left.
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*/
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ai_list = NULL;
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/*
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* First, look up the service name (port) if it was
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* requested. If the socket type wasn't specified, then
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* try and figure it out.
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*/
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if (servname) {
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char *e;
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port = strtol(servname, &e, 10);
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if (*e == '\0') {
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if (socktype == 0)
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return (EAI_SOCKTYPE);
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if (port < 0 || port > 65535)
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return (EAI_SERVICE);
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port = htons(port);
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} else {
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sp = getservbyname(servname, proto);
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if (sp == NULL)
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return (EAI_SERVICE);
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port = sp->s_port;
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if (socktype == 0) {
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if (strcmp(sp->s_proto, "tcp"))
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socktype = SOCK_STREAM;
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else if (strcmp(sp->s_proto, "udp"))
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socktype = SOCK_DGRAM;
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}
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}
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} else
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port = 0;
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/*
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* Next, deal with just a service name, and no hostname.
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* (we verified that one of them was non-null up above).
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*/
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if (hostname == NULL && (flags & AI_PASSIVE) != 0) {
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if (family == AF_INET || family == 0) {
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ai = ai_alloc(AF_INET, sizeof(struct sockaddr_in));
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if (ai == NULL)
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return (EAI_MEMORY);
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ai->ai_socktype = socktype;
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ai->ai_protocol = protocol;
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SIN(ai->ai_addr)->sin_port = port;
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ai->ai_next = ai_list;
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ai_list = ai;
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}
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if (family == AF_INET6 || family == 0) {
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ai = ai_alloc(AF_INET6, sizeof(struct sockaddr_in6));
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if (ai == NULL) {
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freeaddrinfo(ai_list);
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return (EAI_MEMORY);
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}
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ai->ai_socktype = socktype;
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ai->ai_protocol = protocol;
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SIN6(ai->ai_addr)->sin6_port = port;
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ai->ai_next = ai_list;
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ai_list = ai;
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}
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*res = ai_list;
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return (0);
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}
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/*
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* If the family isn't specified or AI_NUMERICHOST specified,
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* check first to see if it * is a numeric address.
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* Though the gethostbyname2() routine
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* will recognize numeric addresses, it will only recognize
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* the format that it is being called for. Thus, a numeric
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* AF_INET address will be treated by the AF_INET6 call as
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* a domain name, and vice versa. Checking for both numerics
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* here avoids that.
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*/
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if (hostname != NULL &&
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(family == 0 || (flags & AI_NUMERICHOST) != 0)) {
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char abuf[sizeof(struct in6_addr)];
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char nbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx00")];
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int addrsize, addroff;
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if (inet_aton(hostname, (struct in_addr *)abuf)) {
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if (family == AF_INET6) {
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/* Convert to a V4 mapped address */
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struct in6_addr *a6 = (struct in6_addr *)abuf;
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memcpy(&a6->s6_addr[12], &a6->s6_addr[0], 4);
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memset(&a6->s6_addr[10], 0xff, 2);
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memset(&a6->s6_addr[0], 0, 10);
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goto inet6_addr;
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}
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addrsize = sizeof(struct in_addr);
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addroff = (char *)(&SIN(0)->sin_addr) - (char *)0;
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family = AF_INET;
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goto common;
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} else if (inet_pton(AF_INET6, hostname, abuf)) {
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if (family && family != AF_INET6)
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return (EAI_NONAME);
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inet6_addr:
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addrsize = sizeof(struct in6_addr);
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addroff = (char *)(&SIN6(0)->sin6_addr) - (char *)0;
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family = AF_INET6;
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common:
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if ((ai = ai_clone(ai_list, family)) == NULL)
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return (EAI_MEMORY);
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ai_list = ai;
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ai->ai_socktype = socktype;
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SIN(ai->ai_addr)->sin_port = port;
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memcpy((char *)ai->ai_addr + addroff, abuf, addrsize);
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if (flags & AI_CANONNAME) {
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inet_ntop(family, abuf, nbuf, sizeof(nbuf));
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ai->ai_canonname = strdup(nbuf);
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}
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goto done;
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} else if ((flags & AI_NUMERICHOST) != 0){
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return (EAI_NONAME);
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}
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}
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set_order(family, net_order);
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for (i = 0; i < FOUND_MAX; i++) {
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if (net_order[i] == NULL)
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break;
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if ((err = (net_order[i])(hostname, flags, &ai_list,
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socktype, port)) != 0)
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return(err);
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}
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if (ai_list == NULL)
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return (EAI_NODATA);
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done:
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ai_list = ai_reverse(ai_list);
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*res = ai_list;
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return (0);
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}
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static void
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set_order(family, net_order)
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int family;
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int (**net_order)();
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{
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char *order, *tok;
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int found;
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if (family) {
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switch (family) {
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case AF_INET:
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*net_order++ = add_ipv4;
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break;
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case AF_INET6:
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*net_order++ = add_ipv6;
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break;
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}
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} else {
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order = getenv("NET_ORDER");
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found = 0;
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while (order != NULL) {
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/* We ignore any unknown names. */
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tok = strsep(&order, ":");
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if (strcasecmp(tok, "inet6") == 0) {
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if ((found & FOUND_IPV6) == 0)
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*net_order++ = add_ipv6;
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found |= FOUND_IPV6;
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} else if (strcasecmp(tok, "inet") == 0 ||
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strcasecmp(tok, "inet4") == 0) {
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if ((found & FOUND_IPV4) == 0)
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*net_order++ = add_ipv4;
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found |= FOUND_IPV4;
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}
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}
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/* Add in anything that we didn't find */
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if ((found & FOUND_IPV4) == 0)
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*net_order++ = add_ipv4;
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if ((found & FOUND_IPV6) == 0)
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*net_order++ = add_ipv6;
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}
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*net_order = NULL;
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return;
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}
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static char v4_loop[4] = { 127, 0, 0, 1 };
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static int
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add_ipv4(const char *hostname, int flags, struct addrinfo **aip,
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int socktype, int port)
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{
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struct addrinfo *ai;
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struct hostent *hp;
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char **addr;
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if (hostname == NULL && (flags & AI_PASSIVE) == 0) {
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if ((ai = ai_clone(*aip, AF_INET)) == NULL) {
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freeaddrinfo(*aip);
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return(EAI_MEMORY);
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}
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*aip = ai;
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ai->ai_socktype = socktype;
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SIN(ai->ai_addr)->sin_port = port;
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memcpy(&SIN(ai->ai_addr)->sin_addr, v4_loop, 4);
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} else if ((hp = gethostbyname2(hostname, AF_INET)) != NULL) {
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for (addr = hp->h_addr_list; *addr; addr++) {
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if ((ai = ai_clone(*aip, hp->h_addrtype)) == NULL) {
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freeaddrinfo(*aip);
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return(EAI_MEMORY);
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}
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*aip = ai;
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ai->ai_socktype = socktype;
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/* We get IPv6 addresses if RES_USE_INET6 is set */
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if (hp->h_addrtype == AF_INET6) {
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SIN6(ai->ai_addr)->sin6_port = port;
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memcpy(&SIN6(ai->ai_addr)->sin6_addr, *addr,
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hp->h_length);
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} else {
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SIN(ai->ai_addr)->sin_port = port;
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memcpy(&SIN(ai->ai_addr)->sin_addr, *addr,
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hp->h_length);
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}
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if (flags & AI_CANONNAME)
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ai->ai_canonname = strdup(hp->h_name);
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}
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}
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return(0);
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}
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static char v6_loop[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 };
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static int
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add_ipv6(const char *hostname, int flags, struct addrinfo **aip,
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int socktype, int port)
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{
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struct addrinfo *ai;
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struct hostent *hp;
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char **addr;
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|
|
if (hostname == NULL && (flags & AI_PASSIVE) == 0) {
|
||
|
|
if ((ai = ai_clone(*aip, AF_INET6)) == NULL) {
|
||
|
|
freeaddrinfo(*aip);
|
||
|
|
return(EAI_MEMORY);
|
||
|
|
}
|
||
|
|
|
||
|
|
*aip = ai;
|
||
|
|
ai->ai_socktype = socktype;
|
||
|
|
SIN6(ai->ai_addr)->sin6_port = port;
|
||
|
|
memcpy(&SIN6(ai->ai_addr)->sin6_addr, v6_loop, 16);
|
||
|
|
} else if ((hp = gethostbyname2(hostname, AF_INET6)) != NULL) {
|
||
|
|
for (addr = hp->h_addr_list; *addr; addr++) {
|
||
|
|
if ((ai = ai_clone(*aip, AF_INET6)) == NULL) {
|
||
|
|
freeaddrinfo(*aip);
|
||
|
|
return (EAI_MEMORY);
|
||
|
|
}
|
||
|
|
*aip = ai;
|
||
|
|
ai->ai_socktype = socktype;
|
||
|
|
SIN6(ai->ai_addr)->sin6_port = port;
|
||
|
|
memcpy(&SIN6(ai->ai_addr)->sin6_addr, *addr,
|
||
|
|
hp->h_length);
|
||
|
|
if (flags & AI_CANONNAME)
|
||
|
|
ai->ai_canonname = strdup(hp->h_name);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
freeaddrinfo(struct addrinfo *ai) {
|
||
|
|
struct addrinfo *ai_next;
|
||
|
|
|
||
|
|
while (ai != NULL) {
|
||
|
|
ai_next = ai->ai_next;
|
||
|
|
if (ai->ai_addr)
|
||
|
|
free(ai->ai_addr);
|
||
|
|
if (ai->ai_canonname)
|
||
|
|
free(ai->ai_canonname);
|
||
|
|
free(ai);
|
||
|
|
ai = ai_next;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef AF_LOCAL
|
||
|
|
static int
|
||
|
|
get_local(const char *name, int socktype, struct addrinfo **res) {
|
||
|
|
struct addrinfo *ai;
|
||
|
|
struct sockaddr_un *sun;
|
||
|
|
|
||
|
|
if (socktype == 0)
|
||
|
|
return (EAI_SOCKTYPE);
|
||
|
|
|
||
|
|
if ((ai = ai_alloc(AF_LOCAL, sizeof(*sun))) == NULL)
|
||
|
|
return (EAI_MEMORY);
|
||
|
|
|
||
|
|
sun = SUN(ai->ai_addr);
|
||
|
|
strncpy(sun->sun_path, name, sizeof(sun->sun_path));
|
||
|
|
|
||
|
|
ai->ai_socktype = socktype;
|
||
|
|
/*
|
||
|
|
* ai->ai_flags, ai->ai_protocol, ai->ai_canonname,
|
||
|
|
* and ai->ai_next were initialized to zero.
|
||
|
|
*/
|
||
|
|
|
||
|
|
*res = ai;
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Allocate an addrinfo structure, and a sockaddr structure
|
||
|
|
* of the specificed length. We initialize:
|
||
|
|
* ai_addrlen
|
||
|
|
* ai_family
|
||
|
|
* ai_addr
|
||
|
|
* ai_addr->sa_family
|
||
|
|
* ai_addr->sa_len (HAVE_SA_LEN)
|
||
|
|
* and everything else is initialized to zero.
|
||
|
|
*/
|
||
|
|
static struct addrinfo *
|
||
|
|
ai_alloc(int family, int addrlen) {
|
||
|
|
struct addrinfo *ai;
|
||
|
|
|
||
|
|
if ((ai = (struct addrinfo *)calloc(1, sizeof(*ai))) == NULL)
|
||
|
|
return (NULL);
|
||
|
|
|
||
|
|
if ((ai->ai_addr = SA(calloc(1, addrlen))) == NULL) {
|
||
|
|
free(ai);
|
||
|
|
return (NULL);
|
||
|
|
}
|
||
|
|
ai->ai_addrlen = addrlen;
|
||
|
|
ai->ai_family = family;
|
||
|
|
ai->ai_addr->sa_family = family;
|
||
|
|
#ifdef HAVE_SA_LEN
|
||
|
|
ai->ai_addr->sa_len = addrlen;
|
||
|
|
#endif
|
||
|
|
return (ai);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct addrinfo *
|
||
|
|
ai_clone(struct addrinfo *oai, int family) {
|
||
|
|
struct addrinfo *ai;
|
||
|
|
|
||
|
|
ai = ai_alloc(family, ((family == AF_INET6) ?
|
||
|
|
sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in)));
|
||
|
|
|
||
|
|
if (ai == NULL) {
|
||
|
|
freeaddrinfo(oai);
|
||
|
|
return (NULL);
|
||
|
|
}
|
||
|
|
if (oai == NULL)
|
||
|
|
return (ai);
|
||
|
|
|
||
|
|
ai->ai_flags = oai->ai_flags;
|
||
|
|
ai->ai_socktype = oai->ai_socktype;
|
||
|
|
ai->ai_protocol = oai->ai_protocol;
|
||
|
|
ai->ai_canonname = NULL;
|
||
|
|
ai->ai_next = oai;
|
||
|
|
return (ai);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct addrinfo *
|
||
|
|
ai_reverse(struct addrinfo *oai) {
|
||
|
|
struct addrinfo *nai, *tai;
|
||
|
|
|
||
|
|
nai = NULL;
|
||
|
|
|
||
|
|
while (oai) {
|
||
|
|
/* grab one off the old list */
|
||
|
|
tai = oai;
|
||
|
|
oai = oai->ai_next;
|
||
|
|
/* put it on the front of the new list */
|
||
|
|
tai->ai_next = nai;
|
||
|
|
nai = tai;
|
||
|
|
}
|
||
|
|
return (nai);
|
||
|
|
}
|