Staging
v0.8.1
v0.8.1
swh:1:snp:635f4099902912592851108bcac178ff574f7c5f
Tip revision: 74f4bd53e03ded8408bcc2de67cf0f5a4ac5b1a1 authored by Barry Warsaw on 23 February 2012, 15:59:38 UTC
Bump some more copyright years (as per PEP 101), since this is the first
Bump some more copyright years (as per PEP 101), since this is the first
Tip revision: 74f4bd5
getaddrinfo.c
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* GAI_ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR GAI_ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON GAI_ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN GAI_ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
*
* Issues to be discussed:
* - Thread safe-ness must be checked.
* - Return values. There are nonstandard return values defined and used
* in the source code. This is because RFC2133 is silent about which error
* code must be returned for which situation.
* - PF_UNSPEC case would be handled in getipnodebyname() with the AI_ALL flag.
*/
#if 0
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <netdb.h>
#include <resolv.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <ctype.h>
#include <unistd.h>
#include "addrinfo.h"
#endif
#if defined(__KAME__) && defined(ENABLE_IPV6)
# define FAITH
#endif
#define SUCCESS 0
#define GAI_ANY 0
#define YES 1
#define NO 0
#ifdef FAITH
static int translate = NO;
static struct in6_addr faith_prefix = IN6ADDR_GAI_ANY_INIT;
#endif
static const char in_addrany[] = { 0, 0, 0, 0 };
static const char in6_addrany[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static const char in_loopback[] = { 127, 0, 0, 1 };
static const char in6_loopback[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
};
struct sockinet {
u_char si_len;
u_char si_family;
u_short si_port;
};
static struct gai_afd {
int a_af;
int a_addrlen;
int a_socklen;
int a_off;
const char *a_addrany;
const char *a_loopback;
} gai_afdl [] = {
#ifdef ENABLE_IPV6
#define N_INET6 0
{PF_INET6, sizeof(struct in6_addr),
sizeof(struct sockaddr_in6),
offsetof(struct sockaddr_in6, sin6_addr),
in6_addrany, in6_loopback},
#define N_INET 1
#else
#define N_INET 0
#endif
{PF_INET, sizeof(struct in_addr),
sizeof(struct sockaddr_in),
offsetof(struct sockaddr_in, sin_addr),
in_addrany, in_loopback},
{0, 0, 0, 0, NULL, NULL},
};
#ifdef ENABLE_IPV6
#define PTON_MAX 16
#else
#define PTON_MAX 4
#endif
#ifndef IN_MULTICAST
#define IN_MULTICAST(i) (((i) & 0xf0000000U) == 0xe0000000U)
#endif
#ifndef IN_EXPERIMENTAL
#define IN_EXPERIMENTAL(i) (((i) & 0xe0000000U) == 0xe0000000U)
#endif
#ifndef IN_LOOPBACKNET
#define IN_LOOPBACKNET 127
#endif
static int get_name Py_PROTO((const char *, struct gai_afd *,
struct addrinfo **, char *, struct addrinfo *,
int));
static int get_addr Py_PROTO((const char *, int, struct addrinfo **,
struct addrinfo *, int));
static int str_isnumber Py_PROTO((const char *));
static char *ai_errlist[] = {
"success.",
"address family for hostname not supported.", /* EAI_ADDRFAMILY */
"temporary failure in name resolution.", /* EAI_AGAIN */
"invalid value for ai_flags.", /* EAI_BADFLAGS */
"non-recoverable failure in name resolution.", /* EAI_FAIL */
"ai_family not supported.", /* EAI_FAMILY */
"memory allocation failure.", /* EAI_MEMORY */
"no address associated with hostname.", /* EAI_NODATA */
"hostname nor servname provided, or not known.",/* EAI_NONAME */
"servname not supported for ai_socktype.", /* EAI_SERVICE */
"ai_socktype not supported.", /* EAI_SOCKTYPE */
"system error returned in errno.", /* EAI_SYSTEM */
"invalid value for hints.", /* EAI_BADHINTS */
"resolved protocol is unknown.", /* EAI_PROTOCOL */
"unknown error.", /* EAI_MAX */
};
#define GET_CANONNAME(ai, str) \
if (pai->ai_flags & AI_CANONNAME) {\
if (((ai)->ai_canonname = (char *)malloc(strlen(str) + 1)) != NULL) {\
strcpy((ai)->ai_canonname, (str));\
} else {\
error = EAI_MEMORY;\
goto free;\
}\
}
#ifdef HAVE_SOCKADDR_SA_LEN
#define GET_AI(ai, gai_afd, addr, port) {\
char *p;\
if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
((gai_afd)->a_socklen)))\
== NULL) goto free;\
memcpy(ai, pai, sizeof(struct addrinfo));\
(ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
memset((ai)->ai_addr, 0, (gai_afd)->a_socklen);\
(ai)->ai_addr->sa_len = (ai)->ai_addrlen = (gai_afd)->a_socklen;\
(ai)->ai_addr->sa_family = (ai)->ai_family = (gai_afd)->a_af;\
((struct sockinet *)(ai)->ai_addr)->si_port = port;\
p = (char *)((ai)->ai_addr);\
memcpy(p + (gai_afd)->a_off, (addr), (gai_afd)->a_addrlen);\
}
#else
#define GET_AI(ai, gai_afd, addr, port) {\
char *p;\
if (((ai) = (struct addrinfo *)malloc(sizeof(struct addrinfo) +\
((gai_afd)->a_socklen)))\
== NULL) goto free;\
memcpy(ai, pai, sizeof(struct addrinfo));\
(ai)->ai_addr = (struct sockaddr *)((ai) + 1);\
memset((ai)->ai_addr, 0, (gai_afd)->a_socklen);\
(ai)->ai_addrlen = (gai_afd)->a_socklen;\
(ai)->ai_addr->sa_family = (ai)->ai_family = (gai_afd)->a_af;\
((struct sockinet *)(ai)->ai_addr)->si_port = port;\
p = (char *)((ai)->ai_addr);\
memcpy(p + (gai_afd)->a_off, (addr), (gai_afd)->a_addrlen);\
}
#endif
#define ERR(err) { error = (err); goto bad; }
char *
gai_strerror(int ecode)
{
if (ecode < 0 || ecode > EAI_MAX)
ecode = EAI_MAX;
return ai_errlist[ecode];
}
void
freeaddrinfo(struct addrinfo *ai)
{
struct addrinfo *next;
do {
next = ai->ai_next;
if (ai->ai_canonname)
free(ai->ai_canonname);
/* no need to free(ai->ai_addr) */
free(ai);
} while ((ai = next) != NULL);
}
static int
str_isnumber(const char *p)
{
unsigned char *q = (unsigned char *)p;
while (*q) {
if (! isdigit(*q))
return NO;
q++;
}
return YES;
}
int
getaddrinfo(const char*hostname, const char*servname,
const struct addrinfo *hints, struct addrinfo **res)
{
struct addrinfo sentinel;
struct addrinfo *top = NULL;
struct addrinfo *cur;
int i, error = 0;
char pton[PTON_MAX];
struct addrinfo ai;
struct addrinfo *pai;
u_short port;
#ifdef FAITH
static int firsttime = 1;
if (firsttime) {
/* translator hack */
{
char *q = getenv("GAI");
if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
translate = YES;
}
firsttime = 0;
}
#endif
/* initialize file static vars */
sentinel.ai_next = NULL;
cur = &sentinel;
pai = &ai;
pai->ai_flags = 0;
pai->ai_family = PF_UNSPEC;
pai->ai_socktype = GAI_ANY;
pai->ai_protocol = GAI_ANY;
pai->ai_addrlen = 0;
pai->ai_canonname = NULL;
pai->ai_addr = NULL;
pai->ai_next = NULL;
port = GAI_ANY;
if (hostname == NULL && servname == NULL)
return EAI_NONAME;
if (hints) {
/* error check for hints */
if (hints->ai_addrlen || hints->ai_canonname ||
hints->ai_addr || hints->ai_next)
ERR(EAI_BADHINTS); /* xxx */
if (hints->ai_flags & ~AI_MASK)
ERR(EAI_BADFLAGS);
switch (hints->ai_family) {
case PF_UNSPEC:
case PF_INET:
#ifdef ENABLE_IPV6
case PF_INET6:
#endif
break;
default:
ERR(EAI_FAMILY);
}
memcpy(pai, hints, sizeof(*pai));
switch (pai->ai_socktype) {
case GAI_ANY:
switch (pai->ai_protocol) {
case GAI_ANY:
break;
case IPPROTO_UDP:
pai->ai_socktype = SOCK_DGRAM;
break;
case IPPROTO_TCP:
pai->ai_socktype = SOCK_STREAM;
break;
default:
pai->ai_socktype = SOCK_RAW;
break;
}
break;
case SOCK_RAW:
break;
case SOCK_DGRAM:
if (pai->ai_protocol != IPPROTO_UDP &&
pai->ai_protocol != GAI_ANY)
ERR(EAI_BADHINTS); /*xxx*/
pai->ai_protocol = IPPROTO_UDP;
break;
case SOCK_STREAM:
if (pai->ai_protocol != IPPROTO_TCP &&
pai->ai_protocol != GAI_ANY)
ERR(EAI_BADHINTS); /*xxx*/
pai->ai_protocol = IPPROTO_TCP;
break;
default:
ERR(EAI_SOCKTYPE);
/* unreachable */
}
}
/*
* service port
*/
if (servname) {
if (str_isnumber(servname)) {
if (pai->ai_socktype == GAI_ANY) {
/* caller accept *GAI_ANY* socktype */
pai->ai_socktype = SOCK_DGRAM;
pai->ai_protocol = IPPROTO_UDP;
}
port = htons((u_short)atoi(servname));
} else {
struct servent *sp;
char *proto;
proto = NULL;
switch (pai->ai_socktype) {
case GAI_ANY:
proto = NULL;
break;
case SOCK_DGRAM:
proto = "udp";
break;
case SOCK_STREAM:
proto = "tcp";
break;
default:
fprintf(stderr, "panic!\n");
break;
}
if ((sp = getservbyname(servname, proto)) == NULL)
ERR(EAI_SERVICE);
port = sp->s_port;
if (pai->ai_socktype == GAI_ANY) {
if (strcmp(sp->s_proto, "udp") == 0) {
pai->ai_socktype = SOCK_DGRAM;
pai->ai_protocol = IPPROTO_UDP;
} else if (strcmp(sp->s_proto, "tcp") == 0) {
pai->ai_socktype = SOCK_STREAM;
pai->ai_protocol = IPPROTO_TCP;
} else
ERR(EAI_PROTOCOL); /*xxx*/
}
}
}
/*
* hostname == NULL.
* passive socket -> anyaddr (0.0.0.0 or ::)
* non-passive socket -> localhost (127.0.0.1 or ::1)
*/
if (hostname == NULL) {
struct gai_afd *gai_afd;
for (gai_afd = &gai_afdl[0]; gai_afd->a_af; gai_afd++) {
if (!(pai->ai_family == PF_UNSPEC
|| pai->ai_family == gai_afd->a_af)) {
continue;
}
if (pai->ai_flags & AI_PASSIVE) {
GET_AI(cur->ai_next, gai_afd, gai_afd->a_addrany, port);
/* xxx meaningless?
* GET_CANONNAME(cur->ai_next, "anyaddr");
*/
} else {
GET_AI(cur->ai_next, gai_afd, gai_afd->a_loopback,
port);
/* xxx meaningless?
* GET_CANONNAME(cur->ai_next, "localhost");
*/
}
cur = cur->ai_next;
}
top = sentinel.ai_next;
if (top)
goto good;
else
ERR(EAI_FAMILY);
}
/* hostname as numeric name */
for (i = 0; gai_afdl[i].a_af; i++) {
if (inet_pton(gai_afdl[i].a_af, hostname, pton)) {
u_long v4a;
#ifdef ENABLE_IPV6
u_char pfx;
#endif
switch (gai_afdl[i].a_af) {
case AF_INET:
v4a = ((struct in_addr *)pton)->s_addr;
v4a = ntohl(v4a);
if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
pai->ai_flags &= ~AI_CANONNAME;
v4a >>= IN_CLASSA_NSHIFT;
if (v4a == 0 || v4a == IN_LOOPBACKNET)
pai->ai_flags &= ~AI_CANONNAME;
break;
#ifdef ENABLE_IPV6
case AF_INET6:
pfx = ((struct in6_addr *)pton)->s6_addr8[0];
if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
pai->ai_flags &= ~AI_CANONNAME;
break;
#endif
}
if (pai->ai_family == gai_afdl[i].a_af ||
pai->ai_family == PF_UNSPEC) {
if (! (pai->ai_flags & AI_CANONNAME)) {
GET_AI(top, &gai_afdl[i], pton, port);
goto good;
}
/*
* if AI_CANONNAME and if reverse lookup
* fail, return ai anyway to pacify
* calling application.
*
* XXX getaddrinfo() is a name->address
* translation function, and it looks strange
* that we do addr->name translation here.
*/
get_name(pton, &gai_afdl[i], &top, pton, pai, port);
goto good;
} else
ERR(EAI_FAMILY); /*xxx*/
}
}
if (pai->ai_flags & AI_NUMERICHOST)
ERR(EAI_NONAME);
/* hostname as alphabetical name */
error = get_addr(hostname, pai->ai_family, &top, pai, port);
if (error == 0) {
if (top) {
good:
*res = top;
return SUCCESS;
} else
error = EAI_FAIL;
}
free:
if (top)
freeaddrinfo(top);
bad:
*res = NULL;
return error;
}
static int
get_name(addr, gai_afd, res, numaddr, pai, port0)
const char *addr;
struct gai_afd *gai_afd;
struct addrinfo **res;
char *numaddr;
struct addrinfo *pai;
int port0;
{
u_short port = port0 & 0xffff;
struct hostent *hp;
struct addrinfo *cur;
int error = 0;
#ifdef ENABLE_IPV6
int h_error;
#endif
#ifdef ENABLE_IPV6
hp = getipnodebyaddr(addr, gai_afd->a_addrlen, gai_afd->a_af, &h_error);
#else
hp = gethostbyaddr(addr, gai_afd->a_addrlen, AF_INET);
#endif
if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
GET_AI(cur, gai_afd, hp->h_addr_list[0], port);
GET_CANONNAME(cur, hp->h_name);
} else
GET_AI(cur, gai_afd, numaddr, port);
#ifdef ENABLE_IPV6
if (hp)
freehostent(hp);
#endif
*res = cur;
return SUCCESS;
free:
if (cur)
freeaddrinfo(cur);
#ifdef ENABLE_IPV6
if (hp)
freehostent(hp);
#endif
/* bad: */
*res = NULL;
return error;
}
static int
get_addr(hostname, af, res, pai, port0)
const char *hostname;
int af;
struct addrinfo **res;
struct addrinfo *pai;
int port0;
{
u_short port = port0 & 0xffff;
struct addrinfo sentinel;
struct hostent *hp;
struct addrinfo *top, *cur;
struct gai_afd *gai_afd;
int i, error = 0, h_error;
char *ap;
top = NULL;
sentinel.ai_next = NULL;
cur = &sentinel;
#ifdef ENABLE_IPV6
if (af == AF_UNSPEC) {
hp = getipnodebyname(hostname, AF_INET6,
AI_ADDRCONFIG|AI_ALL|AI_V4MAPPED, &h_error);
} else
hp = getipnodebyname(hostname, af, AI_ADDRCONFIG, &h_error);
#else
hp = gethostbyname(hostname);
h_error = h_errno;
#endif
if (hp == NULL) {
switch (h_error) {
case HOST_NOT_FOUND:
case NO_DATA:
error = EAI_NODATA;
break;
case TRY_AGAIN:
error = EAI_AGAIN;
break;
case NO_RECOVERY:
default:
error = EAI_FAIL;
break;
}
goto free;
}
if ((hp->h_name == NULL) || (hp->h_name[0] == 0) ||
(hp->h_addr_list[0] == NULL)) {
error = EAI_FAIL;
goto free;
}
for (i = 0; (ap = hp->h_addr_list[i]) != NULL; i++) {
switch (af) {
#ifdef ENABLE_IPV6
case AF_INET6:
gai_afd = &gai_afdl[N_INET6];
break;
#endif
#ifndef ENABLE_IPV6
default: /* AF_UNSPEC */
#endif
case AF_INET:
gai_afd = &gai_afdl[N_INET];
break;
#ifdef ENABLE_IPV6
default: /* AF_UNSPEC */
if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
ap += sizeof(struct in6_addr) -
sizeof(struct in_addr);
gai_afd = &gai_afdl[N_INET];
} else
gai_afd = &gai_afdl[N_INET6];
break;
#endif
}
#ifdef FAITH
if (translate && gai_afd->a_af == AF_INET) {
struct in6_addr *in6;
GET_AI(cur->ai_next, &gai_afdl[N_INET6], ap, port);
in6 = &((struct sockaddr_in6 *)cur->ai_next->ai_addr)->sin6_addr;
memcpy(&in6->s6_addr32[0], &faith_prefix,
sizeof(struct in6_addr) - sizeof(struct in_addr));
memcpy(&in6->s6_addr32[3], ap, sizeof(struct in_addr));
} else
#endif /* FAITH */
GET_AI(cur->ai_next, gai_afd, ap, port);
if (cur == &sentinel) {
top = cur->ai_next;
GET_CANONNAME(top, hp->h_name);
}
cur = cur->ai_next;
}
#ifdef ENABLE_IPV6
freehostent(hp);
#endif
*res = top;
return SUCCESS;
free:
if (top)
freeaddrinfo(top);
#ifdef ENABLE_IPV6
if (hp)
freehostent(hp);
#endif
/* bad: */
*res = NULL;
return error;
}