cpython/Modules/getaddrinfo.c at 3.9 · python-emscripten/cpython · GitHub

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* 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

* 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 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 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 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(const char *, struct gai_afd *,

struct addrinfo **, char *, struct addrinfo *,

int);

static int get_addr(const char *, int, struct addrinfo **,

struct addrinfo *, int);

static int str_isnumber(const char *);

static const char * const 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; }

const 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 */

{

const 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;

const 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_addr[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;

}

cpython/Modules/getaddrinfo.c at 3.9 · python-emscripten/cpython · GitHub

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