diff options
Diffstat (limited to 'newlib/libc/sys/linux/net/getaddrinfo.c')
| -rw-r--r-- | newlib/libc/sys/linux/net/getaddrinfo.c | 1700 |
1 files changed, 0 insertions, 1700 deletions
diff --git a/newlib/libc/sys/linux/net/getaddrinfo.c b/newlib/libc/sys/linux/net/getaddrinfo.c deleted file mode 100644 index 7019260b4..000000000 --- a/newlib/libc/sys/linux/net/getaddrinfo.c +++ /dev/null @@ -1,1700 +0,0 @@ -/* The Inner Net License, Version 2.00 - - The author(s) grant permission for redistribution and use in source and -binary forms, with or without modification, of the software and documentation -provided that the following conditions are met: - -0. If you receive a version of the software that is specifically labelled - as not being for redistribution (check the version message and/or README), - you are not permitted to redistribute that version of the software in any - way or form. -1. All terms of the all other applicable copyrights and licenses must be - followed. -2. Redistributions of source code must retain the authors' copyright - notice(s), this list of conditions, and the following disclaimer. -3. Redistributions in binary form must reproduce the authors' copyright - notice(s), this list of conditions, and the following disclaimer in the - documentation and/or other materials provided with the distribution. -4. [The copyright holder has authorized the removal of this clause.] -5. Neither the name(s) of the author(s) 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 ITS AUTHORS 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 AUTHORS 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. - - If these license terms cause you a real problem, contact the author. */ - -/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */ - -#include <alloca.h> -#include <sys/types.h> -#include <assert.h> -#include <errno.h> -#include <ifaddrs.h> -#include <netdb.h> -#include <resolv.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <arpa/inet.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <sys/un.h> -#include <sys/utsname.h> -#include <net/if.h> -#include <nsswitch.h> -#include <not-cancel.h> -#include <nscd/nscd-client.h> -#include <nscd/nscd_proto.h> -#include <limits.h> -#include "local.h" - -#ifdef HAVE_LIBIDN -extern int __idna_to_ascii_lz (const char *input, char **output, int flags); -extern int __idna_to_unicode_lzlz (const char *input, char **output, - int flags); -# include <libidn/idna.h> -#endif - -#define GAIH_OKIFUNSPEC 0x0100 -#define GAIH_EAI ~(GAIH_OKIFUNSPEC) - -#ifndef UNIX_PATH_MAX -#define UNIX_PATH_MAX 108 -#endif - -struct gaih_service - { - const char *name; - int num; - }; - -struct gaih_servtuple - { - struct gaih_servtuple *next; - int socktype; - int protocol; - int port; - }; - -static const struct gaih_servtuple nullserv; - -struct gaih_addrtuple - { - struct gaih_addrtuple *next; - char *name; - int family; - uint32_t addr[4]; - uint32_t scopeid; - }; - -struct gaih_typeproto - { - int socktype; - int protocol; - char name[4]; - int protoflag; - }; - -/* Values for `protoflag'. */ -#define GAI_PROTO_NOSERVICE 1 -#define GAI_PROTO_PROTOANY 2 - -static const struct gaih_typeproto gaih_inet_typeproto[] = -{ - { 0, 0, "", 0 }, - { SOCK_STREAM, IPPROTO_TCP, "tcp", 0 }, - { SOCK_DGRAM, IPPROTO_UDP, "udp", 0 }, - { SOCK_RAW, 0, "raw", GAI_PROTO_PROTOANY|GAI_PROTO_NOSERVICE }, - { 0, 0, "", 0 } -}; - -struct gaih - { - int family; - int (*gaih)(const char *name, const struct gaih_service *service, - const struct addrinfo *req, struct addrinfo **pai); - }; - -static const struct addrinfo default_hints = - { - .ai_flags = AI_DEFAULT, - .ai_family = PF_UNSPEC, - .ai_socktype = 0, - .ai_protocol = 0, - .ai_addrlen = 0, - .ai_addr = NULL, - .ai_canonname = NULL, - .ai_next = NULL - }; - -#define s6_addr32 __u6_addr.__u6_addr32 - -#if 0 -/* Using Unix sockets this way is a security risk. */ -static int -gaih_local (const char *name, const struct gaih_service *service, - const struct addrinfo *req, struct addrinfo **pai) -{ - struct utsname utsname; - - if ((name != NULL) && (req->ai_flags & AI_NUMERICHOST)) - return GAIH_OKIFUNSPEC | -EAI_NONAME; - - if ((name != NULL) || (req->ai_flags & AI_CANONNAME)) - if (uname (&utsname) < 0) - return -EAI_SYSTEM; - - if (name != NULL) - { - if (strcmp(name, "localhost") && - strcmp(name, "local") && - strcmp(name, "unix") && - strcmp(name, utsname.nodename)) - return GAIH_OKIFUNSPEC | -EAI_NONAME; - } - - if (req->ai_protocol || req->ai_socktype) - { - const struct gaih_typeproto *tp = gaih_inet_typeproto + 1; - - while (tp->name[0] - && ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0 - || (req->ai_socktype != 0 && req->ai_socktype != tp->socktype) - || (req->ai_protocol != 0 - && !(tp->protoflag & GAI_PROTO_PROTOANY) - && req->ai_protocol != tp->protocol))) - ++tp; - - if (! tp->name[0]) - { - if (req->ai_socktype) - return (GAIH_OKIFUNSPEC | -EAI_SOCKTYPE); - else - return (GAIH_OKIFUNSPEC | -EAI_SERVICE); - } - } - - *pai = malloc (sizeof (struct addrinfo) + sizeof (struct sockaddr_un) - + ((req->ai_flags & AI_CANONNAME) - ? (strlen(utsname.nodename) + 1): 0)); - if (*pai == NULL) - return -EAI_MEMORY; - - (*pai)->ai_next = NULL; - (*pai)->ai_flags = req->ai_flags; - (*pai)->ai_family = AF_LOCAL; - (*pai)->ai_socktype = req->ai_socktype ? req->ai_socktype : SOCK_STREAM; - (*pai)->ai_protocol = req->ai_protocol; - (*pai)->ai_addrlen = sizeof (struct sockaddr_un); - (*pai)->ai_addr = (void *) (*pai) + sizeof (struct addrinfo); - -#if SALEN - ((struct sockaddr_un *) (*pai)->ai_addr)->sun_len = - sizeof (struct sockaddr_un); -#endif /* SALEN */ - - ((struct sockaddr_un *)(*pai)->ai_addr)->sun_family = AF_LOCAL; - memset(((struct sockaddr_un *)(*pai)->ai_addr)->sun_path, 0, UNIX_PATH_MAX); - - if (service) - { - struct sockaddr_un *sunp = (struct sockaddr_un *) (*pai)->ai_addr; - - if (strchr (service->name, '/') != NULL) - { - if (strlen (service->name) >= sizeof (sunp->sun_path)) - return GAIH_OKIFUNSPEC | -EAI_SERVICE; - - strcpy (sunp->sun_path, service->name); - } - else - { - if (strlen (P_tmpdir "/") + 1 + strlen (service->name) >= - sizeof (sunp->sun_path)) - return GAIH_OKIFUNSPEC | -EAI_SERVICE; - - __stpcpy (__stpcpy (sunp->sun_path, P_tmpdir "/"), service->name); - } - } - else - { - /* This is a dangerous use of the interface since there is a time - window between the test for the file and the actual creation - (done by the caller) in which a file with the same name could - be created. */ - char *buf = ((struct sockaddr_un *) (*pai)->ai_addr)->sun_path; - - if (__builtin_expect (__path_search (buf, L_tmpnam, NULL, NULL, 0), - 0) != 0 - || __builtin_expect (__gen_tempname (buf, __GT_NOCREATE), 0) != 0) - return -EAI_SYSTEM; - } - - if (req->ai_flags & AI_CANONNAME) - (*pai)->ai_canonname = strcpy ((char *) *pai + sizeof (struct addrinfo) - + sizeof (struct sockaddr_un), - utsname.nodename); - else - (*pai)->ai_canonname = NULL; - return 0; -} -#endif /* 0 */ - -static int -gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp, - const struct addrinfo *req, struct gaih_servtuple *st) -{ - struct servent *s; - size_t tmpbuflen = 1024; - struct servent ts; - char *tmpbuf; - int r; - - do - { - tmpbuf = alloca (tmpbuflen); - - r = __getservbyname_r (servicename, tp->name, &ts, tmpbuf, tmpbuflen, - &s); - if (r != 0 || s == NULL) - { - if (r == ERANGE) - tmpbuflen *= 2; - else - return GAIH_OKIFUNSPEC | -EAI_SERVICE; - } - } - while (r); - - st->next = NULL; - st->socktype = tp->socktype; - st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY) - ? req->ai_protocol : tp->protocol); - st->port = s->s_port; - - return 0; -} - -#define gethosts(_family, _type) \ - { \ - int i; \ - int herrno; \ - struct hostent th; \ - struct hostent *h; \ - char *localcanon = NULL; \ - no_data = 0; \ - while (1) { \ - rc = 0; \ - status = DL_CALL_FCT (fct, (name, _family, &th, tmpbuf, tmpbuflen, \ - &rc, &herrno, NULL, &localcanon)); \ - if (rc != ERANGE || herrno != NETDB_INTERNAL) \ - break; \ - tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); \ - } \ - if (status == NSS_STATUS_SUCCESS && rc == 0) \ - h = &th; \ - else \ - h = NULL; \ - if (rc != 0) \ - { \ - if (herrno == NETDB_INTERNAL) \ - { \ - h_errno = (herrno); \ - return -EAI_SYSTEM; \ - } \ - if (herrno == TRY_AGAIN) \ - no_data = EAI_AGAIN; \ - else \ - no_data = herrno == NO_DATA; \ - } \ - else if (h != NULL) \ - { \ - for (i = 0; h->h_addr_list[i]; i++) \ - { \ - if (*pat == NULL) \ - { \ - *pat = alloca (sizeof (struct gaih_addrtuple)); \ - (*pat)->scopeid = 0; \ - } \ - uint32_t *addr = (*pat)->addr; \ - (*pat)->next = NULL; \ - if (i == 0) \ - { \ - (*pat)->name = alloca (strlen (h->h_name) + 1); \ - strcpy ((*pat)->name, h->h_name); \ - } \ - else \ - (*pat)->name = NULL; \ - if (_family == AF_INET && req->ai_family == AF_INET6) \ - { \ - (*pat)->family = AF_INET6; \ - addr[3] = *(uint32_t *) h->h_addr_list[i]; \ - addr[2] = htonl (0xffff); \ - addr[1] = 0; \ - addr[0] = 0; \ - } \ - else \ - { \ - (*pat)->family = _family; \ - memcpy (addr, h->h_addr_list[i], sizeof(_type)); \ - } \ - pat = &((*pat)->next); \ - } \ - \ - if (localcanon != NULL && canon == NULL) \ - { \ - canon = alloca (strlen (localcanon) + 1); \ - strcpy (canon, localcanon); \ - } \ - \ - if (_family == AF_INET6 && i > 0) \ - got_ipv6 = true; \ - } \ - } - - -typedef enum nss_status (*nss_gethostbyname3_r) - (const char *name, int af, struct hostent *host, - char *buffer, size_t buflen, int *errnop, - int *h_errnop, int32_t *ttlp, char **canonp); -typedef enum nss_status (*nss_getcanonname_r) - (const char *name, char *buffer, size_t buflen, char **result, - int *errnop, int *h_errnop); -extern service_user *__nss_hosts_database attribute_hidden; - -static int -gaih_inet (const char *name, const struct gaih_service *service, - const struct addrinfo *req, struct addrinfo **pai) -{ - const struct gaih_typeproto *tp = gaih_inet_typeproto; - struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv; - struct gaih_addrtuple *at = NULL; - int rc; - bool got_ipv6 = false; - const char *canon = NULL; - const char *orig_name = name; - - if (req->ai_protocol || req->ai_socktype) - { - ++tp; - - while (tp->name[0] - && ((req->ai_socktype != 0 && req->ai_socktype != tp->socktype) - || (req->ai_protocol != 0 - && !(tp->protoflag & GAI_PROTO_PROTOANY) - && req->ai_protocol != tp->protocol))) - ++tp; - - if (! tp->name[0]) - { - if (req->ai_socktype) - return (GAIH_OKIFUNSPEC | -EAI_SOCKTYPE); - else - return (GAIH_OKIFUNSPEC | -EAI_SERVICE); - } - } - - if (service != NULL) - { - if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0) - return (GAIH_OKIFUNSPEC | -EAI_SERVICE); - - if (service->num < 0) - { - if (tp->name[0]) - { - st = (struct gaih_servtuple *) - alloca (sizeof (struct gaih_servtuple)); - - if ((rc = gaih_inet_serv (service->name, tp, req, st))) - return rc; - } - else - { - struct gaih_servtuple **pst = &st; - for (tp++; tp->name[0]; tp++) - { - struct gaih_servtuple *newp; - - if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0) - continue; - - if (req->ai_socktype != 0 - && req->ai_socktype != tp->socktype) - continue; - if (req->ai_protocol != 0 - && !(tp->protoflag & GAI_PROTO_PROTOANY) - && req->ai_protocol != tp->protocol) - continue; - - newp = (struct gaih_servtuple *) - alloca (sizeof (struct gaih_servtuple)); - - if ((rc = gaih_inet_serv (service->name, tp, req, newp))) - { - if (rc & GAIH_OKIFUNSPEC) - continue; - return rc; - } - - *pst = newp; - pst = &(newp->next); - } - if (st == (struct gaih_servtuple *) &nullserv) - return (GAIH_OKIFUNSPEC | -EAI_SERVICE); - } - } - else - { - if (req->ai_socktype || req->ai_protocol) - { - st = alloca (sizeof (struct gaih_servtuple)); - st->next = NULL; - st->socktype = tp->socktype; - st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY) - ? req->ai_protocol : tp->protocol); - st->port = htons (service->num); - } - else - { - /* Neither socket type nor protocol is set. Return all - socket types we know about. */ - struct gaih_servtuple **lastp = &st; - for (tp = gaih_inet_typeproto + 1; tp->name[0]; ++tp) - if ((tp->protoflag & GAI_PROTO_NOSERVICE) == 0) - { - struct gaih_servtuple *newp; - - newp = alloca (sizeof (struct gaih_servtuple)); - newp->next = NULL; - newp->socktype = tp->socktype; - newp->protocol = tp->protocol; - newp->port = htons (service->num); - - *lastp = newp; - lastp = &newp->next; - } - } - } - } - else if (req->ai_socktype || req->ai_protocol) - { - st = alloca (sizeof (struct gaih_servtuple)); - st->next = NULL; - st->socktype = tp->socktype; - st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY) - ? req->ai_protocol : tp->protocol); - st->port = 0; - } - else - { - /* Neither socket type nor protocol is set. Return all socket types - we know about. */ - struct gaih_servtuple **lastp = &st; - for (++tp; tp->name[0]; ++tp) - { - struct gaih_servtuple *newp; - - newp = alloca (sizeof (struct gaih_servtuple)); - newp->next = NULL; - newp->socktype = tp->socktype; - newp->protocol = tp->protocol; - newp->port = 0; - - *lastp = newp; - lastp = &newp->next; - } - } - - if (name != NULL) - { - at = alloca (sizeof (struct gaih_addrtuple)); - - at->family = AF_UNSPEC; - at->scopeid = 0; - at->next = NULL; - -#ifdef HAVE_LIBIDN - if (req->ai_flags & AI_IDN) - { - int idn_flags = 0; - if (req->ai_flags & AI_IDN_ALLOW_UNASSIGNED) - idn_flags |= IDNA_ALLOW_UNASSIGNED; - if (req->ai_flags & AI_IDN_USE_STD3_ASCII_RULES) - idn_flags |= IDNA_USE_STD3_ASCII_RULES; - - char *p = NULL; - rc = __idna_to_ascii_lz (name, &p, idn_flags); - if (rc != IDNA_SUCCESS) - { - if (rc == IDNA_MALLOC_ERROR) - return -EAI_MEMORY; - if (rc == IDNA_DLOPEN_ERROR) - return -EAI_SYSTEM; - return -EAI_IDN_ENCODE; - } - /* In case the output string is the same as the input string - no new string has been allocated. */ - if (p != name) - { - name = alloca (strlen (p) + 1); - strcpy (name, p); - free (p); - } - } -#endif - - if (inet_aton (name, (struct in_addr *) at->addr) != 0) - { - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) - at->family = AF_INET; - else if (req->ai_family == AF_INET6 && req->ai_flags & AI_V4MAPPED) - { - at->addr[3] = at->addr[0]; - at->addr[2] = htonl (0xffff); - at->addr[1] = 0; - at->addr[0] = 0; - at->family = AF_INET6; - } - else - return -EAI_ADDRFAMILY; - - dupname: - if (req->ai_flags & AI_CANONNAME) - { - canon = strdup (name); - if (canon == NULL) - return -EAI_MEMORY; - } - } - - if (at->family == AF_UNSPEC) - { - char *scope_delim; - char *namebuf = alloca (strlen (name) + 1); - strcpy (namebuf, name); - - scope_delim = strchr (namebuf, SCOPE_DELIMITER); - if (scope_delim != NULL) - *scope_delim = '\0'; - - if (inet_pton (AF_INET6, namebuf, at->addr) > 0) - { - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) - at->family = AF_INET6; - else if (req->ai_family == AF_INET - && IN6_IS_ADDR_V4MAPPED ((struct in6_addr *)at->addr)) - { - at->addr[0] = at->addr[3]; - at->family = AF_INET; - } - else - return -EAI_ADDRFAMILY; - - if (scope_delim != NULL) - { - int try_numericscope = 0; - if (IN6_IS_ADDR_LINKLOCAL ((struct in6_addr *)at->addr) - || IN6_IS_ADDR_MC_LINKLOCAL ((struct in6_addr *)at->addr)) - { - at->scopeid = if_nametoindex (scope_delim + 1); - if (at->scopeid == 0) - try_numericscope = 1; - } - else - try_numericscope = 1; - - if (try_numericscope != 0) - { - char *end; - assert (sizeof (uint32_t) <= sizeof (unsigned long)); - at->scopeid = (uint32_t) strtoul (scope_delim + 1, &end, - 10); - if (*end != '\0') - return GAIH_OKIFUNSPEC | -EAI_NONAME; - } - } - - goto dupname; - } - } - - if (at->family == AF_UNSPEC && (req->ai_flags & AI_NUMERICHOST) == 0) - { - struct gaih_addrtuple **pat = &at; - int no_data = 0; - int no_inet6_data = 0; - service_user *nip = NULL; - enum nss_status inet6_status = NSS_STATUS_UNAVAIL; - enum nss_status status = NSS_STATUS_UNAVAIL; - int no_more; - int old_res_options; - - /* If we do not have to look for IPv4 and IPv6 together, use - the simple, old functions. */ - if (req->ai_family == AF_INET || req->ai_family == AF_INET6) - { - int family = req->ai_family; - size_t tmpbuflen = 512; - char *tmpbuf = alloca (tmpbuflen); - int rc; - struct hostent th; - struct hostent *h; - int herrno; - - simple_again: - while (1) - { - rc = __gethostbyname2_r (name, family, &th, tmpbuf, - tmpbuflen, &h, &herrno); - if (rc != ERANGE || herrno != NETDB_INTERNAL) - break; - tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen); - } - - if (rc == 0) - { - if (h == NULL) - { - if (req->ai_family == AF_INET6 - && (req->ai_flags & AI_V4MAPPED) - && family == AF_INET6) - { - /* Try again, this time looking for IPv4 - addresses. */ - family = AF_INET; - goto simple_again; - } - } - else - { - /* We found data, now convert it into the list. */ - int i = 0; - for (i = 0; h->h_addr_list[i]; ++i) - { - if (*pat == NULL) - { - *pat = alloca (sizeof (struct gaih_addrtuple)); - (*pat)->scopeid = 0; - } - (*pat)->next = NULL; - (*pat)->family = req->ai_family; - if (family == req->ai_family) - memcpy ((*pat)->addr, h->h_addr_list[i], - h->h_length); - else - { - int32_t *addr = (uint32_t *) (*pat)->addr; - addr[3] = *(uint32_t *) h->h_addr_list[i]; - addr[2] = htonl (0xffff); - addr[1] = 0; - addr[0] = 0; - } - pat = &((*pat)->next); - } - } - } - else - { - if (herrno == NETDB_INTERNAL) - { - h_errno = (herrno); - return -EAI_SYSTEM; - } - if (herrno == TRY_AGAIN) - { - return -EAI_AGAIN; - } - /* We made requests but they turned out no data. - The name is known, though. */ - return (GAIH_OKIFUNSPEC | -EAI_NODATA); - } - - goto process_list; - } - -#ifdef USE_NSCD - if (__nss_not_use_nscd_hosts > 0 - && ++__nss_not_use_nscd_hosts > NSS_NSCD_RETRY) - __nss_not_use_nscd_hosts = 0; - - if (!__nss_not_use_nscd_hosts) - { - /* Try to use nscd. */ - struct nscd_ai_result *air = NULL; - int herrno; - int err = __nscd_getai (name, &air, &herrno); - if (air != NULL) - { - /* Transform into gaih_addrtuple list. */ - bool added_canon = (req->ai_flags & AI_CANONNAME) == 0; - char *addrs = air->addrs; - - for (int i = 0; i < air->naddrs; ++i) - { - socklen_t size = (air->family[i] == AF_INET - ? INADDRSZ : IN6ADDRSZ); - if (*pat == NULL) - { - *pat = alloca (sizeof (struct gaih_addrtuple)); - (*pat)->scopeid = 0; - } - uint32_t *pataddr = (*pat)->addr; - (*pat)->next = NULL; - if (added_canon || air->canon == NULL) - (*pat)->name = NULL; - else { - canon = (*pat)->name = alloca (strlen (air->canon) + 1); - strcpy (canon, air->canon); - } - - if (air->family[i] == AF_INET - && req->ai_family == AF_INET6 - && (req->ai_flags & AI_V4MAPPED)) - { - (*pat)->family = AF_INET6; - pataddr[3] = *(uint32_t *) addrs; - pataddr[2] = htonl (0xffff); - pataddr[1] = 0; - pataddr[0] = 0; - pat = &((*pat)->next); - added_canon = true; - } - else if (req->ai_family == AF_UNSPEC - || air->family[i] == req->ai_family) - { - (*pat)->family = air->family[i]; - memcpy (pataddr, addrs, size); - pat = &((*pat)->next); - added_canon = true; - if (air->family[i] == AF_INET6) - got_ipv6 = true; - } - addrs += size; - } - - free (air); - - if (at->family == AF_UNSPEC) - return (GAIH_OKIFUNSPEC | -EAI_NONAME); - - goto process_list; - } - else if (err != 0 && __nss_not_use_nscd_hosts == 0) - { - if (herrno == NETDB_INTERNAL && errno == ENOMEM) - return -EAI_MEMORY; - if (herrno == TRY_AGAIN) - return -EAI_AGAIN; - return -EAI_SYSTEM; - } - } -#endif - - if (__nss_hosts_database != NULL) - { - no_more = 0; - nip = __nss_hosts_database; - } - else - no_more = __nss_database_lookup ("hosts", NULL, - "dns [!UNAVAIL=return] files", - &nip); - - if (__res_maybe_init (&_res, 0) == -1) - no_more = 1; - - /* If we are looking for both IPv4 and IPv6 address we don't - want the lookup functions to automatically promote IPv4 - addresses to IPv6 addresses. Currently this is decided - by setting the RES_USE_INET6 bit in _res.options. */ - old_res_options = _res.options; - _res.options &= ~RES_USE_INET6; - - size_t tmpbuflen = 512; - char *tmpbuf = alloca (tmpbuflen); - - while (!no_more) - { - nss_gethostbyname3_r fct = NULL; - if (req->ai_flags & AI_CANONNAME) - /* No need to use this function if we do not look for - the canonical name. The function does not exist in - all NSS modules and therefore the lookup would - often fail. */ - fct = __nss_lookup_function (nip, "gethostbyname3_r"); - if (fct == NULL) - /* We are cheating here. The gethostbyname2_r function does - not have the same interface as gethostbyname3_r but the - extra arguments the latter takes are added at the end. - So the gethostbyname2_r code will just ignore them. */ - fct = __nss_lookup_function (nip, "gethostbyname2_r"); - - if (fct != NULL) - { - if (req->ai_family == AF_INET6 - || req->ai_family == AF_UNSPEC) - { - gethosts (AF_INET6, struct in6_addr); - no_inet6_data = no_data; - inet6_status = status; - } - if (req->ai_family == AF_INET - || req->ai_family == AF_UNSPEC - || (req->ai_family == AF_INET6 - && (req->ai_flags & AI_V4MAPPED) - /* Avoid generating the mapped addresses if we - know we are not going to need them. */ - && ((req->ai_flags & AI_ALL) || !got_ipv6))) - { - gethosts (AF_INET, struct in_addr); - - if (req->ai_family == AF_INET) - { - no_inet6_data = no_data; - inet6_status = status; - } - } - - /* If we found one address for AF_INET or AF_INET6, - don't continue the search. */ - if (inet6_status == NSS_STATUS_SUCCESS - || status == NSS_STATUS_SUCCESS) - { - if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL) - { - /* If we need the canonical name, get it - from the same service as the result. */ - nss_getcanonname_r cfct; - int herrno; - - cfct = __nss_lookup_function (nip, "getcanonname_r"); - if (cfct != NULL) - { - const size_t max_fqdn_len = 256; - char *buf = alloca (max_fqdn_len); - char *s; - - if (DL_CALL_FCT (cfct, (at->name ?: name, buf, - max_fqdn_len, &s, &rc, - &herrno)) - == NSS_STATUS_SUCCESS) - canon = s; - else - /* Set to name now to avoid using - gethostbyaddr. */ - canon = name; - } - } - - break; - } - - /* We can have different states for AF_INET and - AF_INET6. Try to find a useful one for both. */ - if (inet6_status == NSS_STATUS_TRYAGAIN) - status = NSS_STATUS_TRYAGAIN; - else if (status == NSS_STATUS_UNAVAIL && - inet6_status != NSS_STATUS_UNAVAIL) - status = inet6_status; - } - - if (nss_next_action (nip, status) == NSS_ACTION_RETURN) - break; - - if (nip->next == NULL) - no_more = -1; - else - nip = nip->next; - } - - _res.options = old_res_options; - - if (no_data != 0 && no_inet6_data != 0) - { - /* If both requests timed out report this. */ - if (no_data == EAI_AGAIN && no_inet6_data == EAI_AGAIN) - return -EAI_AGAIN; - - /* We made requests but they turned out no data. The name - is known, though. */ - return (GAIH_OKIFUNSPEC | -EAI_NODATA); - } - } - - process_list: - if (at->family == AF_UNSPEC) - return (GAIH_OKIFUNSPEC | -EAI_NONAME); - } - else - { - struct gaih_addrtuple *atr; - atr = at = alloca (sizeof (struct gaih_addrtuple)); - memset (at, '\0', sizeof (struct gaih_addrtuple)); - - if (req->ai_family == AF_UNSPEC) - { - at->next = alloca (sizeof (struct gaih_addrtuple)); - memset (at->next, '\0', sizeof (struct gaih_addrtuple)); - } - - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) - { - at->family = AF_INET6; - if ((req->ai_flags & AI_PASSIVE) == 0) - memcpy (at->addr, &in6addr_loopback, sizeof (struct in6_addr)); - atr = at->next; - } - - if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) - { - atr->family = AF_INET; - if ((req->ai_flags & AI_PASSIVE) == 0) - atr->addr[0] = htonl (INADDR_LOOPBACK); - } - } - - if (pai == NULL) - return 0; - - { - struct gaih_servtuple *st2; - struct gaih_addrtuple *at2 = at; - size_t socklen; - sa_family_t family; - - /* - buffer is the size of an unformatted IPv6 address in printable format. - */ - while (at2 != NULL) - { - /* Only the first entry gets the canonical name. */ - if (at2 == at && (req->ai_flags & AI_CANONNAME) != 0) - { - if (canon == NULL) - { - struct hostent *h = NULL; - int herrno; - struct hostent th; - size_t tmpbuflen = 512; - char *tmpbuf = NULL; - - do - { - tmpbuf = extend_alloca (tmpbuf, tmpbuflen, tmpbuflen * 2); - rc = __gethostbyaddr_r (at2->addr, - ((at2->family == AF_INET6) - ? sizeof (struct in6_addr) - : sizeof (struct in_addr)), - at2->family, &th, tmpbuf, - tmpbuflen, &h, &herrno); - } - while (rc == ERANGE && herrno == NETDB_INTERNAL); - - if (rc != 0 && herrno == NETDB_INTERNAL) - { - h_errno = (herrno); - return -EAI_SYSTEM; - } - - if (h != NULL) - canon = h->h_name; - else - { - assert (orig_name != NULL); - /* If the canonical name cannot be determined, use - the passed in string. */ - canon = orig_name; - } - } - -#ifdef HAVE_LIBIDN - if (req->ai_flags & AI_CANONIDN) - { - int idn_flags = 0; - if (req->ai_flags & AI_IDN_ALLOW_UNASSIGNED) - idn_flags |= IDNA_ALLOW_UNASSIGNED; - if (req->ai_flags & AI_IDN_USE_STD3_ASCII_RULES) - idn_flags |= IDNA_USE_STD3_ASCII_RULES; - - char *out; - int rc = __idna_to_unicode_lzlz (canon, &out, idn_flags); - if (rc != IDNA_SUCCESS) - { - if (rc == IDNA_MALLOC_ERROR) - return -EAI_MEMORY; - if (rc == IDNA_DLOPEN_ERROR) - return -EAI_SYSTEM; - return -EAI_IDN_ENCODE; - } - /* In case the output string is the same as the input - string no new string has been allocated. Otherwise - make a copy. */ - if (out == canon) - goto make_copy; - } - else -#endif - { -#ifdef HAVE_LIBIDN - make_copy: -#endif - canon = strdup (canon); - if (canon == NULL) - return -EAI_MEMORY; - } - } - - if (at2->family == AF_INET6) - { - family = AF_INET6; - socklen = sizeof (struct sockaddr_in6); - - /* If we looked up IPv4 mapped address discard them here if - the caller isn't interested in all address and we have - found at least one IPv6 address. */ - if (got_ipv6 - && (req->ai_flags & (AI_V4MAPPED|AI_ALL)) == AI_V4MAPPED - && IN6_IS_ADDR_V4MAPPED ((struct in6_addr *)at2->addr)) - goto ignore; - } - else - { - family = AF_INET; - socklen = sizeof (struct sockaddr_in); - } - - for (st2 = st; st2 != NULL; st2 = st2->next) - { - struct addrinfo *ai; - ai = *pai = malloc (sizeof (struct addrinfo) + socklen); - if (ai == NULL) - return -EAI_MEMORY; - - ai->ai_flags = req->ai_flags; - ai->ai_family = family; - ai->ai_socktype = st2->socktype; - ai->ai_protocol = st2->protocol; - ai->ai_addrlen = socklen; - ai->ai_addr = (void *) (ai + 1); - - /* We only add the canonical name once. */ - ai->ai_canonname = (char *) canon; - canon = NULL; - -#if SALEN - ai->ai_addr->sa_len = socklen; -#endif /* SALEN */ - ai->ai_addr->sa_family = family; - - if (family == AF_INET6) - { - struct sockaddr_in6 *sin6p = - (struct sockaddr_in6 *) ai->ai_addr; - - sin6p->sin6_port = st2->port; - sin6p->sin6_flowinfo = 0; - memcpy (&sin6p->sin6_addr, - at2->addr, sizeof (struct in6_addr)); - sin6p->sin6_scope_id = at2->scopeid; - } - else - { - struct sockaddr_in *sinp = - (struct sockaddr_in *) ai->ai_addr; - sinp->sin_port = st2->port; - memcpy (&sinp->sin_addr, - at2->addr, sizeof (struct in_addr)); - memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero)); - } - - pai = &(ai->ai_next); - } - *pai = NULL; - - ignore: - at2 = at2->next; - } - } - return 0; -} - -static struct gaih gaih[] = - { - { PF_INET6, gaih_inet }, - { PF_INET, gaih_inet }, -#if 0 - { PF_LOCAL, gaih_local }, -#endif - { PF_UNSPEC, NULL } - }; - -struct sort_result -{ - struct addrinfo *dest_addr; - struct sockaddr_storage source_addr; - uint8_t source_addr_len; - bool got_source_addr; -}; - - -static int -get_scope (const struct sockaddr_storage *ss) -{ - int scope; - if (ss->ss_family == PF_INET6) - { - const struct sockaddr_in6 *in6 = (const struct sockaddr_in6 *) ss; - - if (! IN6_IS_ADDR_MULTICAST (&in6->sin6_addr)) - { - if (IN6_IS_ADDR_LINKLOCAL (&in6->sin6_addr)) - scope = 2; - else if (IN6_IS_ADDR_SITELOCAL (&in6->sin6_addr)) - scope = 5; - else - /* XXX Is this the correct default behavior? */ - scope = 14; - } - else - scope = in6->sin6_addr.s6_addr[1] & 0xf; - } - else if (ss->ss_family == PF_INET) - { - const struct sockaddr_in *in = (const struct sockaddr_in *) ss; - const uint8_t *addr = (const uint8_t *) &in->sin_addr; - - /* RFC 3484 specifies how to map IPv6 addresses to scopes. - 169.254/16 and 127/8 are link-local. */ - if ((addr[0] == 169 && addr[1] == 254) || addr[0] == 127) - scope = 2; - else if (addr[0] == 10 || (addr[0] == 172 && addr[1] == 16) - || (addr[0] == 192 && addr[1] == 168)) - scope = 5; - else - scope = 14; - } - else - /* XXX What is a good default? */ - scope = 15; - - return scope; -} - - -/* XXX The system administrator should be able to install other - tables. We need to make this configurable. The problem is that - the kernel is also involved since it needs the same table. */ -static const struct prefixlist -{ - struct in6_addr prefix; - unsigned int bits; - int val; -} default_labels[] = - { - /* See RFC 3484 for the details. */ - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0001 } } }, - 128, 0 }, - { { .__u6_addr = { .__u6_addr16 = { 0x2002, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0000 } } }, - 16, 2 }, - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0000 } } }, - 96, 3 }, - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0xffff, 0x0000, 0x0000 } } }, - 96, 4 }, - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0000 } } }, - 0, 1 } - }; - - -static const struct prefixlist default_precedence[] = - { - /* See RFC 3484 for the details. */ - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0001 } } }, - 128, 50 }, - { { .__u6_addr = { .__u6_addr16 = { 0x2002, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0000 } } }, - 16, 30 }, - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0000 } } }, - 96, 20 }, - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0xffff, 0x0000, 0x0000 } } }, - 96, 10 }, - { { .__u6_addr = { .__u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000, - 0x0000, 0x0000, 0x0000, 0x0000 } } }, - 0, 40 } - }; - - -static int -match_prefix (const struct sockaddr_storage *ss, const struct prefixlist *list, - int default_val) -{ - int idx; - struct sockaddr_in6 in6_mem; - const struct sockaddr_in6 *in6; - - if (ss->ss_family == PF_INET6) - in6 = (const struct sockaddr_in6 *) ss; - else if (ss->ss_family == PF_INET) - { - const struct sockaddr_in *in = (const struct sockaddr_in *) ss; - - /* Convert to IPv6 address. */ - in6_mem.sin6_family = PF_INET6; - in6_mem.sin6_port = in->sin_port; - in6_mem.sin6_flowinfo = 0; - if (in->sin_addr.s_addr == htonl (0x7f000001)) - in6_mem.sin6_addr = (struct in6_addr) IN6ADDR_LOOPBACK_INIT; - else - { - /* Construct a V4-to-6 mapped address. */ - memset (&in6_mem.sin6_addr, '\0', sizeof (in6_mem.sin6_addr)); - in6_mem.sin6_addr.__u6_addr.__u6_addr16[5] = 0xffff; - in6_mem.sin6_addr.__u6_addr.__u6_addr32[3] = in->sin_addr.s_addr; - in6_mem.sin6_scope_id = 0; - } - - in6 = &in6_mem; - } - else - return default_val; - - for (idx = 0; ; ++idx) - { - unsigned int bits = list[idx].bits; - uint8_t *mask = list[idx].prefix.s6_addr; - uint8_t *val = in6->sin6_addr.s6_addr; - - while (bits > 8) - { - if (*mask != *val) - break; - - ++mask; - ++val; - bits -= 8; - } - - if (bits < 8) - { - if ((*mask & (0xff00 >> bits)) == (*val & (0xff00 >> bits))) - /* Match! */ - break; - } - } - - return list[idx].val; -} - - -static int -get_label (const struct sockaddr_storage *ss) -{ - /* XXX What is a good default value? */ - return match_prefix (ss, default_labels, INT_MAX); -} - - -static int -get_precedence (const struct sockaddr_storage *ss) -{ - /* XXX What is a good default value? */ - return match_prefix (ss, default_precedence, 0); -} - - -static int -rfc3484_sort (const void *p1, const void *p2) -{ - const struct sort_result *a1 = (const struct sort_result *) p1; - const struct sort_result *a2 = (const struct sort_result *) p2; - - /* Rule 1: Avoid unusable destinations. - We have the got_source_addr flag set if the destination is reachable. */ - if (a1->got_source_addr && ! a2->got_source_addr) - return -1; - if (! a1->got_source_addr && a2->got_source_addr) - return 1; - - - /* Rule 2: Prefer matching scope. Only interesting if both - destination addresses are IPv6. */ - int a1_dst_scope - = get_scope ((struct sockaddr_storage *) a1->dest_addr->ai_addr); - - int a2_dst_scope - = get_scope ((struct sockaddr_storage *) a2->dest_addr->ai_addr); - - if (a1->got_source_addr) - { - int a1_src_scope = get_scope (&a1->source_addr); - int a2_src_scope = get_scope (&a2->source_addr); - - if (a1_dst_scope == a1_src_scope && a2_dst_scope != a2_src_scope) - return -1; - if (a1_dst_scope != a1_src_scope && a2_dst_scope == a2_src_scope) - return 1; - } - - - /* Rule 3: Avoid deprecated addresses. - That's something only the kernel could decide. */ - - /* Rule 4: Prefer home addresses. - Another thing only the kernel can decide. */ - - /* Rule 5: Prefer matching label. */ - if (a1->got_source_addr) - { - int a1_dst_label - = get_label ((struct sockaddr_storage *) a1->dest_addr->ai_addr); - int a1_src_label = get_label (&a1->source_addr); - - int a2_dst_label - = get_label ((struct sockaddr_storage *) a2->dest_addr->ai_addr); - int a2_src_label = get_label (&a2->source_addr); - - if (a1_dst_label == a1_src_label && a2_dst_label != a2_src_label) - return -1; - if (a1_dst_label != a1_src_label && a2_dst_label == a2_src_label) - return 1; - } - - - /* Rule 6: Prefer higher precedence. */ - int a1_prec - = get_precedence ((struct sockaddr_storage *) a1->dest_addr->ai_addr); - int a2_prec - = get_precedence ((struct sockaddr_storage *) a2->dest_addr->ai_addr); - - if (a1_prec > a2_prec) - return -1; - if (a1_prec < a2_prec) - return 1; - - - /* Rule 7: Prefer native transport. - XXX How to recognize tunnels? */ - - - /* Rule 8: Prefer smaller scope. */ - if (a1_dst_scope < a2_dst_scope) - return -1; - if (a1_dst_scope > a2_dst_scope) - return 1; - - - /* Rule 9: Use longest matching prefix. */ - if (a1->got_source_addr - && a1->dest_addr->ai_family == a2->dest_addr->ai_family) - { - int bit1 = 0; - int bit2 = 0; - - if (a1->dest_addr->ai_family == PF_INET) - { - assert (a1->source_addr.ss_family == PF_INET); - assert (a2->source_addr.ss_family == PF_INET); - - struct sockaddr_in *in1_dst; - struct sockaddr_in *in1_src; - struct sockaddr_in *in2_dst; - struct sockaddr_in *in2_src; - - in1_dst = (struct sockaddr_in *) a1->dest_addr->ai_addr; - in1_src = (struct sockaddr_in *) &a1->source_addr; - in2_dst = (struct sockaddr_in *) a2->dest_addr->ai_addr; - in2_src = (struct sockaddr_in *) &a2->source_addr; - - bit1 = ffs (in1_dst->sin_addr.s_addr ^ in1_src->sin_addr.s_addr); - bit2 = ffs (in2_dst->sin_addr.s_addr ^ in2_src->sin_addr.s_addr); - } - else if (a1->dest_addr->ai_family == PF_INET6) - { - assert (a1->source_addr.ss_family == PF_INET6); - assert (a2->source_addr.ss_family == PF_INET6); - - struct sockaddr_in6 *in1_dst; - struct sockaddr_in6 *in1_src; - struct sockaddr_in6 *in2_dst; - struct sockaddr_in6 *in2_src; - - in1_dst = (struct sockaddr_in6 *) a1->dest_addr->ai_addr; - in1_src = (struct sockaddr_in6 *) &a1->source_addr; - in2_dst = (struct sockaddr_in6 *) a2->dest_addr->ai_addr; - in2_src = (struct sockaddr_in6 *) &a2->source_addr; - - int i; - for (i = 0; i < 4; ++i) - if (in1_dst->sin6_addr.s6_addr32[i] - != in1_src->sin6_addr.s6_addr32[i] - || (in2_dst->sin6_addr.s6_addr32[i] - != in2_src->sin6_addr.s6_addr32[i])) - break; - - if (i < 4) - { - bit1 = ffs (in1_dst->sin6_addr.s6_addr32[i] - ^ in1_src->sin6_addr.s6_addr32[i]); - bit2 = ffs (in2_dst->sin6_addr.s6_addr32[i] - ^ in2_src->sin6_addr.s6_addr32[i]); - } - } - - if (bit1 > bit2) - return -1; - if (bit1 < bit2) - return 1; - } - - - /* Rule 10: Otherwise, leave the order unchanged. */ - return 0; -} - - -int -getaddrinfo (const char *name, const char *service, - const struct addrinfo *hints, struct addrinfo **pai) -{ - int i = 0, j = 0, last_i = 0; - int nresults = 0; - struct addrinfo *p = NULL, **end; - struct gaih *g = gaih, *pg = NULL; - struct gaih_service gaih_service, *pservice; - struct addrinfo local_hints; - - if (name != NULL && name[0] == '*' && name[1] == 0) - name = NULL; - - if (service != NULL && service[0] == '*' && service[1] == 0) - service = NULL; - - if (name == NULL && service == NULL) - return EAI_NONAME; - - if (hints == NULL) - hints = &default_hints; - - if (hints->ai_flags - & ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST|AI_ADDRCONFIG|AI_V4MAPPED -#ifdef HAVE_LIBIDN - |AI_IDN|AI_CANONIDN|AI_IDN_ALLOW_UNASSIGNED - |AI_IDN_USE_STD3_ASCII_RULES -#endif - |AI_NUMERICSERV|AI_ALL)) - return EAI_BADFLAGS; - - if ((hints->ai_flags & AI_CANONNAME) && name == NULL) - return EAI_BADFLAGS; - - if (hints->ai_flags & AI_ADDRCONFIG) - { - /* Determine whether we have IPv4 or IPv6 interfaces or both. - We cannot cache the results since new interfaces could be - added at any time. */ - bool seen_ipv4; - bool seen_ipv6; - __check_pf (&seen_ipv4, &seen_ipv6); - - /* Now make a decision on what we return, if anything. */ - if (hints->ai_family == PF_UNSPEC && (seen_ipv4 || seen_ipv6)) - { - /* If we haven't seen both IPv4 and IPv6 interfaces we can - narrow down the search. */ - if (! seen_ipv4 || ! seen_ipv6) - { - local_hints = *hints; - local_hints.ai_family = seen_ipv4 ? PF_INET : PF_INET6; - hints = &local_hints; - } - } - else if ((hints->ai_family == PF_INET && ! seen_ipv4) - || (hints->ai_family == PF_INET6 && ! seen_ipv6)) - /* We cannot possibly return a valid answer. */ - return EAI_NONAME; - } - - if (service && service[0]) - { - char *c; - gaih_service.name = service; - gaih_service.num = strtoul (gaih_service.name, &c, 10); - if (*c != '\0') - { - if (hints->ai_flags & AI_NUMERICSERV) - return EAI_NONAME; - - gaih_service.num = -1; - } - - pservice = &gaih_service; - } - else - pservice = NULL; - - if (pai) - end = &p; - else - end = NULL; - - while (g->gaih) - { - if (hints->ai_family == g->family || hints->ai_family == AF_UNSPEC) - { - j++; - if (pg == NULL || pg->gaih != g->gaih) - { - pg = g; - i = g->gaih (name, pservice, hints, end); - if (i != 0) - { - /* EAI_NODATA is a more specific result as it says that - we found a result but it is not usable. */ - if (last_i != (GAIH_OKIFUNSPEC | -EAI_NODATA)) - last_i = i; - - if (hints->ai_family == AF_UNSPEC && (i & GAIH_OKIFUNSPEC)) - { - ++g; - continue; - } - - freeaddrinfo (p); - - return -(i & GAIH_EAI); - } - if (end) - while (*end) - { - end = &((*end)->ai_next); - ++nresults; - } - } - } - ++g; - } - - if (j == 0) - return EAI_FAMILY; - - if (nresults > 1) - { - /* Sort results according to RFC 3484. */ - struct sort_result results[nresults]; - struct addrinfo *q; - struct addrinfo *last = NULL; - char *canonname = NULL; - - for (i = 0, q = p; q != NULL; ++i, last = q, q = q->ai_next) - { - results[i].dest_addr = q; - results[i].got_source_addr = false; - - /* If we just looked up the address for a different - protocol, reuse the result. */ - if (last != NULL && last->ai_addrlen == q->ai_addrlen - && memcmp (last->ai_addr, q->ai_addr, q->ai_addrlen) == 0) - { - memcpy (&results[i].source_addr, &results[i - 1].source_addr, - results[i - 1].source_addr_len); - results[i].source_addr_len = results[i - 1].source_addr_len; - results[i].got_source_addr = results[i - 1].got_source_addr; - } - else - { - /* We overwrite the type with SOCK_DGRAM since we do not - want connect() to connect to the other side. If we - cannot determine the source address remember this - fact. */ - int fd = socket (q->ai_family, SOCK_DGRAM, IPPROTO_IP); - socklen_t sl = sizeof (results[i].source_addr); - if (fd != -1 - && connect (fd, q->ai_addr, q->ai_addrlen) == 0 - && getsockname (fd, - (struct sockaddr *) &results[i].source_addr, - &sl) == 0) - { - results[i].source_addr_len = sl; - results[i].got_source_addr = true; - } - else - /* Just make sure that if we have to process the same - address again we do not copy any memory. */ - results[i].source_addr_len = 0; - - if (fd != -1) - close_not_cancel_no_status (fd); - } - - /* Remember the canonical name. */ - if (q->ai_canonname != NULL) - { - assert (canonname == NULL); - canonname = q->ai_canonname; - q->ai_canonname = NULL; - } - } - - /* We got all the source addresses we can get, now sort using - the information. */ - qsort (results, nresults, sizeof (results[0]), rfc3484_sort); - - /* Queue the results up as they come out of sorting. */ - q = p = results[0].dest_addr; - for (i = 1; i < nresults; ++i) - q = q->ai_next = results[i].dest_addr; - q->ai_next = NULL; - - /* Fill in the canonical name into the new first entry. */ - p->ai_canonname = canonname; - } - - if (p) - { - *pai = p; - return 0; - } - - if (pai == NULL && last_i == 0) - return 0; - - return last_i ? -(last_i & GAIH_EAI) : EAI_NONAME; -} -libc_hidden_def (getaddrinfo) - -static_link_warning (getaddrinfo) - -void -freeaddrinfo (struct addrinfo *ai) -{ - struct addrinfo *p; - - while (ai != NULL) - { - p = ai; - ai = ai->ai_next; - free (p->ai_canonname); - free (p); - } -} -libc_hidden_def (freeaddrinfo) |