diff options
Diffstat (limited to 'sysdeps/posix/getaddrinfo.c')
| -rw-r--r-- | sysdeps/posix/getaddrinfo.c | 718 |
1 files changed, 284 insertions, 434 deletions
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index 1ef3f20d98..553833d1f2 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -1,3 +1,21 @@ +/* Host and service name lookups using Name Service Switch modules. + Copyright (C) 1996-2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + /* The Inner Net License, Version 2.00 The author(s) grant permission for redistribution and use in source and @@ -41,7 +59,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include <ifaddrs.h> #include <netdb.h> #include <nss.h> -#include <resolv.h> +#include <resolv/resolv-internal.h> +#include <resolv/resolv_context.h> +#include <resolv/res_use_inet6.h> #include <stdbool.h> #include <stdio.h> #include <stdio_ext.h> @@ -62,13 +82,15 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include <not-cancel.h> #include <nscd/nscd-client.h> #include <nscd/nscd_proto.h> -#include <resolv/res_hconf.h> +#include <scratch_buffer.h> +#include <inet/net-internal.h> + +/* Former AI_IDN_ALLOW_UNASSIGNED and AI_IDN_USE_STD3_ASCII_RULES + flags, now ignored. */ +#define DEPRECATED_AI_IDN 0x300 -#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> +#if IS_IN (libc) +# define feof_unlocked(fp) __feof_unlocked (fp) #endif struct gaih_service @@ -135,24 +157,24 @@ static const struct addrinfo default_hints = static int gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp, - const struct addrinfo *req, struct gaih_servtuple *st) + const struct addrinfo *req, struct gaih_servtuple *st, + struct scratch_buffer *tmpbuf) { 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); + r = __getservbyname_r (servicename, tp->name, &ts, + tmpbuf->data, tmpbuf->length, &s); if (r != 0 || s == NULL) { if (r == ERANGE) - tmpbuflen *= 2; + { + if (!scratch_buffer_grow (tmpbuf)) + return -EAI_MEMORY; + } else return -EAI_SERVICE; } @@ -168,87 +190,114 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp, return 0; } +/* Convert struct hostent to a list of struct gaih_addrtuple objects. + h_name is not copied, and the struct hostent object must not be + deallocated prematurely. *RESULT must be NULL or a pointer to a + linked-list. The new addresses are appended at the end. */ +static bool +convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, + int family, + struct hostent *h, + struct gaih_addrtuple **result) +{ + while (*result) + result = &(*result)->next; + + /* Count the number of addresses in h->h_addr_list. */ + size_t count = 0; + for (char **p = h->h_addr_list; *p != NULL; ++p) + ++count; + + /* Report no data if no addresses are available, or if the incoming + address size is larger than what we can store. */ + if (count == 0 || h->h_length > sizeof (((struct gaih_addrtuple) {}).addr)) + return true; + + struct gaih_addrtuple *array = calloc (count, sizeof (*array)); + if (array == NULL) + return false; + + for (size_t i = 0; i < count; ++i) + { + if (family == AF_INET && req->ai_family == AF_INET6) + { + /* Perform address mapping. */ + array[i].family = AF_INET6; + memcpy(array[i].addr + 3, h->h_addr_list[i], sizeof (uint32_t)); + array[i].addr[2] = htonl (0xffff); + } + else + { + array[i].family = family; + memcpy (array[i].addr, h->h_addr_list[i], h->h_length); + } + array[i].next = array + i + 1; + } + array[0].name = h->h_name; + array[count - 1].next = NULL; + + *result = array; + return true; +} + #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; \ - if (!malloc_tmpbuf && __libc_use_alloca (alloca_used + 2 * tmpbuflen)) \ - tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen, 2 * tmpbuflen, \ - alloca_used); \ - else \ - { \ - char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL, \ - 2 * tmpbuflen); \ - if (newp == NULL) \ - { \ - result = -EAI_MEMORY; \ - goto free_and_return; \ - } \ - tmpbuf = newp; \ - malloc_tmpbuf = true; \ - tmpbuflen = 2 * tmpbuflen; \ - } \ - } \ - if (status == NSS_STATUS_SUCCESS && rc == 0) \ - h = &th; \ - else \ - h = NULL; \ - if (rc != 0) \ + while (1) \ + { \ + status = DL_CALL_FCT (fct, (name, _family, &th, \ + tmpbuf->data, tmpbuf->length, \ + &errno, &h_errno, NULL, &localcanon)); \ + if (status != NSS_STATUS_TRYAGAIN || h_errno != NETDB_INTERNAL \ + || errno != ERANGE) \ + break; \ + if (!scratch_buffer_grow (tmpbuf)) \ + { \ + __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \ + __resolv_context_put (res_ctx); \ + result = -EAI_MEMORY; \ + goto free_and_return; \ + } \ + } \ + if (status == NSS_STATUS_NOTFOUND \ + || status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL) \ { \ - if (herrno == NETDB_INTERNAL) \ + if (h_errno == NETDB_INTERNAL) \ { \ - __set_h_errno (herrno); \ - _res.options |= old_res_options & RES_USE_INET6; \ + __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \ + __resolv_context_put (res_ctx); \ result = -EAI_SYSTEM; \ goto free_and_return; \ } \ - if (herrno == TRY_AGAIN) \ + if (h_errno == TRY_AGAIN) \ no_data = EAI_AGAIN; \ else \ - no_data = herrno == NO_DATA; \ + no_data = h_errno == NO_DATA; \ } \ - else if (h != NULL) \ + else if (status == NSS_STATUS_SUCCESS) \ { \ - for (i = 0; h->h_addr_list[i]; i++) \ + if (!convert_hostent_to_gaih_addrtuple (req, _family, &th, &addrmem)) \ { \ - if (*pat == NULL) \ - { \ - *pat = __alloca (sizeof (struct gaih_addrtuple)); \ - (*pat)->scopeid = 0; \ - } \ - uint32_t *addr = (*pat)->addr; \ - (*pat)->next = NULL; \ - (*pat)->name = i == 0 ? strdupa (h->h_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 \ + __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); \ + __resolv_context_put (res_ctx); \ + result = -EAI_SYSTEM; \ + goto free_and_return; \ + } \ + *pat = addrmem; \ + \ + if (localcanon != NULL && canon == NULL) \ + { \ + canonbuf = __strdup (localcanon); \ + if (canonbuf == NULL) \ { \ - (*pat)->family = _family; \ - memcpy (addr, h->h_addr_list[i], sizeof(_type)); \ + result = -EAI_SYSTEM; \ + goto free_and_return; \ } \ - pat = &((*pat)->next); \ + canon = canonbuf; \ } \ - \ - if (localcanon != NULL && canon == NULL) \ - canon = strdupa (localcanon); \ - \ - if (_family == AF_INET6 && i > 0) \ + if (_family == AF_INET6 && *pat != NULL) \ got_ipv6 = true; \ } \ } @@ -265,22 +314,45 @@ typedef enum nss_status (*nss_gethostbyname3_r) 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; +/* This function is called if a canonical name is requested, but if + the service function did not provide it. It tries to obtain the + name using getcanonname_r from the same service NIP. If the name + cannot be canonicalized, return a copy of NAME. Return NULL on + memory allocation failure. The returned string is allocated on the + heap; the caller has to free it. */ +static char * +getcanonname (service_user *nip, struct gaih_addrtuple *at, const char *name) +{ + nss_getcanonname_r cfct = __nss_lookup_function (nip, "getcanonname_r"); + char *s = (char *) name; + if (cfct != NULL) + { + char buf[256]; + if (DL_CALL_FCT (cfct, (at->name ?: name, buf, sizeof (buf), + &s, &errno, &h_errno)) != NSS_STATUS_SUCCESS) + /* If the canonical name cannot be determined, use the passed + string. */ + s = (char *) name; + } + return __strdup (name); +} static int gaih_inet (const char *name, const struct gaih_service *service, const struct addrinfo *req, struct addrinfo **pai, - unsigned int *naddrs) + unsigned int *naddrs, struct scratch_buffer *tmpbuf) { 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; - size_t alloca_used = 0; + + /* Reserve stack memory for the scratch buffer in the getaddrinfo + function. */ + size_t alloca_used = sizeof (struct scratch_buffer); if (req->ai_protocol || req->ai_socktype) { @@ -315,7 +387,8 @@ gaih_inet (const char *name, const struct gaih_service *service, st = (struct gaih_servtuple *) alloca_account (sizeof (struct gaih_servtuple), alloca_used); - if ((rc = gaih_inet_serv (service->name, tp, req, st))) + int rc = gaih_inet_serv (service->name, tp, req, st, tmpbuf); + if (__glibc_unlikely (rc != 0)) return rc; } else @@ -340,12 +413,9 @@ gaih_inet (const char *name, const struct gaih_service *service, alloca_account (sizeof (struct gaih_servtuple), alloca_used); - if ((rc = gaih_inet_serv (service->name, tp, req, newp))) - { - if (rc) - continue; - return rc; - } + if (gaih_inet_serv (service->name, + tp, req, newp, tmpbuf) != 0) + continue; *pst = newp; pst = &(newp->next); @@ -397,13 +467,10 @@ gaih_inet (const char *name, const struct gaih_service *service, } bool malloc_name = false; - bool malloc_addrmem = false; struct gaih_addrtuple *addrmem = NULL; - bool malloc_canonbuf = false; char *canonbuf = NULL; - bool malloc_tmpbuf = false; - char *tmpbuf = NULL; int result = 0; + if (name != NULL) { at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); @@ -411,35 +478,15 @@ gaih_inet (const char *name, const struct gaih_service *service, 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) - { - /* No need to jump to free_and_return here. */ - 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 = p; - malloc_name = true; - } + char *out; + result = __idna_to_dns_encoding (name, &out); + if (result != 0) + return -result; + name = out; + malloc_name = true; } -#endif if (__inet_aton (name, (struct in_addr *) at->addr) != 0) { @@ -466,46 +513,11 @@ gaih_inet (const char *name, const struct gaih_service *service, { char *scope_delim = strchr (name, SCOPE_DELIMITER); int e; - - { - bool malloc_namebuf = false; - char *namebuf = (char *) name; - - if (__glibc_unlikely (scope_delim != NULL)) - { - if (malloc_name) - *scope_delim = '\0'; - else - { - if (__libc_use_alloca (alloca_used - + scope_delim - name + 1)) - { - namebuf = alloca_account (scope_delim - name + 1, - alloca_used); - *((char *) __mempcpy (namebuf, name, - scope_delim - name)) = '\0'; - } - else - { - namebuf = strndup (name, scope_delim - name); - if (namebuf == NULL) - { - assert (!malloc_name); - return -EAI_MEMORY; - } - malloc_namebuf = true; - } - } - } - - e = inet_pton (AF_INET6, namebuf, at->addr); - - if (malloc_namebuf) - free (namebuf); - else if (scope_delim != NULL && malloc_name) - /* Undo what we did above. */ - *scope_delim = SCOPE_DELIMITER; - } + if (scope_delim == NULL) + e = inet_pton (AF_INET6, name, at->addr); + else + e = __inet_pton_length (AF_INET6, name, scope_delim - name, + at->addr); if (e > 0) { if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) @@ -522,31 +534,13 @@ gaih_inet (const char *name, const struct gaih_service *service, goto free_and_return; } - if (scope_delim != NULL) + if (scope_delim != NULL + && __inet6_scopeid_pton ((struct in6_addr *) at->addr, + scope_delim + 1, + &at->scopeid) != 0) { - int try_numericscope = 0; - if (IN6_IS_ADDR_LINKLOCAL (at->addr) - || IN6_IS_ADDR_MC_LINKLOCAL (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') - { - result = -EAI_NONAME; - goto free_and_return; - } - } + result = -EAI_NONAME; + goto free_and_return; } if (req->ai_flags & AI_CANONNAME) @@ -563,7 +557,8 @@ gaih_inet (const char *name, const struct gaih_service *service, enum nss_status inet6_status = NSS_STATUS_UNAVAIL; enum nss_status status = NSS_STATUS_UNAVAIL; int no_more; - int old_res_options; + struct resolv_context *res_ctx = NULL; + bool res_enable_inet6 = false; /* If we do not have to look for IPv6 addresses or the canonical name, use the simple, old functions, which do not support @@ -571,40 +566,21 @@ gaih_inet (const char *name, const struct gaih_service *service, if (req->ai_family == AF_INET && (req->ai_flags & AI_CANONNAME) == 0) { - /* Allocate additional room for struct host_data. */ - size_t tmpbuflen = (512 + MAX_NR_ALIASES * sizeof(char*) - + 16 * sizeof(char)); - assert (tmpbuf == NULL); - tmpbuf = alloca_account (tmpbuflen, alloca_used); int rc; struct hostent th; struct hostent *h; - int herrno; while (1) { - rc = __gethostbyname2_r (name, AF_INET, &th, tmpbuf, - tmpbuflen, &h, &herrno); - if (rc != ERANGE || herrno != NETDB_INTERNAL) + rc = __gethostbyname2_r (name, AF_INET, &th, + tmpbuf->data, tmpbuf->length, + &h, &h_errno); + if (rc != ERANGE || h_errno != NETDB_INTERNAL) break; - - if (!malloc_tmpbuf - && __libc_use_alloca (alloca_used + 2 * tmpbuflen)) - tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen, - 2 * tmpbuflen, - alloca_used); - else + if (!scratch_buffer_grow (tmpbuf)) { - char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL, - 2 * tmpbuflen); - if (newp == NULL) - { - result = -EAI_MEMORY; - goto free_and_return; - } - tmpbuf = newp; - malloc_tmpbuf = true; - tmpbuflen = 2 * tmpbuflen; + result = -EAI_MEMORY; + goto free_and_return; } } @@ -612,54 +588,29 @@ gaih_inet (const char *name, const struct gaih_service *service, { if (h != NULL) { - int i; - /* We found data, count the number of addresses. */ - for (i = 0; h->h_addr_list[i]; ++i) - ; - if (i > 0 && *pat != NULL) - --i; - - if (__libc_use_alloca (alloca_used - + i * sizeof (struct gaih_addrtuple))) - addrmem = alloca_account (i * sizeof (struct gaih_addrtuple), - alloca_used); - else - { - addrmem = malloc (i - * sizeof (struct gaih_addrtuple)); - if (addrmem == NULL) - { - result = -EAI_MEMORY; - goto free_and_return; - } - malloc_addrmem = true; - } - - /* Now convert it into the list. */ - struct gaih_addrtuple *addrfree = addrmem; - for (i = 0; h->h_addr_list[i]; ++i) + /* We found data, convert it. */ + if (!convert_hostent_to_gaih_addrtuple + (req, AF_INET, h, &addrmem)) { - if (*pat == NULL) - { - *pat = addrfree++; - (*pat)->scopeid = 0; - } - (*pat)->next = NULL; - (*pat)->family = AF_INET; - memcpy ((*pat)->addr, h->h_addr_list[i], - h->h_length); - pat = &((*pat)->next); + result = -EAI_MEMORY; + goto free_and_return; } + *pat = addrmem; + } + else + { + if (h_errno == NO_DATA) + result = -EAI_NODATA; + else + result = -EAI_NONAME; + goto free_and_return; } } else { - if (herrno == NETDB_INTERNAL) - { - __set_h_errno (herrno); - result = -EAI_SYSTEM; - } - else if (herrno == TRY_AGAIN) + if (h_errno == NETDB_INTERNAL) + result = -EAI_SYSTEM; + else if (h_errno == TRY_AGAIN) result = -EAI_AGAIN; else /* We made requests but they turned out no data. @@ -682,29 +633,18 @@ gaih_inet (const char *name, const struct gaih_service *service, { /* Try to use nscd. */ struct nscd_ai_result *air = NULL; - int herrno; - int err = __nscd_getai (name, &air, &herrno); + int err = __nscd_getai (name, &air, &h_errno); if (air != NULL) { /* Transform into gaih_addrtuple list. */ bool added_canon = (req->ai_flags & AI_CANONNAME) == 0; char *addrs = air->addrs; - if (__libc_use_alloca (alloca_used - + air->naddrs * sizeof (struct gaih_addrtuple))) - addrmem = alloca_account (air->naddrs - * sizeof (struct gaih_addrtuple), - alloca_used); - else + addrmem = calloc (air->naddrs, sizeof (*addrmem)); + if (addrmem == NULL) { - addrmem = malloc (air->naddrs - * sizeof (struct gaih_addrtuple)); - if (addrmem == NULL) - { - result = -EAI_MEMORY; - goto free_and_return; - } - malloc_addrmem = true; + result = -EAI_MEMORY; + goto free_and_return; } struct gaih_addrtuple *addrfree = addrmem; @@ -735,22 +675,13 @@ gaih_inet (const char *name, const struct gaih_service *service, (*pat)->name = NULL; else if (canonbuf == NULL) { - size_t canonlen = strlen (air->canon) + 1; - if ((req->ai_flags & AI_CANONIDN) != 0 - && __libc_use_alloca (alloca_used + canonlen)) - canonbuf = alloca_account (canonlen, alloca_used); - else + canonbuf = __strdup (air->canon); + if (canonbuf == NULL) { - canonbuf = malloc (canonlen); - if (canonbuf == NULL) - { - result = -EAI_MEMORY; - goto free_and_return; - } - malloc_canonbuf = true; + result = -EAI_MEMORY; + goto free_and_return; } - canon = (*pat)->name = memcpy (canonbuf, air->canon, - canonlen); + canon = (*pat)->name = canonbuf; } if (air->family[i] == AF_INET @@ -793,9 +724,9 @@ gaih_inet (const char *name, const struct gaih_service *service, goto free_and_return; else if (__nss_not_use_nscd_hosts == 0) { - if (herrno == NETDB_INTERNAL && errno == ENOMEM) + if (h_errno == NETDB_INTERNAL && errno == ENOMEM) result = -EAI_MEMORY; - else if (herrno == TRY_AGAIN) + else if (h_errno == TRY_AGAIN) result = -EAI_AGAIN; else result = -EAI_SYSTEM; @@ -813,34 +744,14 @@ gaih_inet (const char *name, const struct gaih_service *service, no_more = 0; nip = __nss_hosts_database; - /* Initialize configurations. */ - if (__glibc_unlikely (!_res_hconf.initialized)) - _res_hconf_init (); - 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 = 1024 + sizeof(struct gaih_addrtuple); - malloc_tmpbuf = !__libc_use_alloca (alloca_used + tmpbuflen); - assert (tmpbuf == NULL); - if (!malloc_tmpbuf) - tmpbuf = alloca_account (tmpbuflen, alloca_used); - else - { - tmpbuf = malloc (tmpbuflen); - if (tmpbuf == NULL) - { - _res.options |= old_res_options & RES_USE_INET6; - result = -EAI_MEMORY; - goto free_and_return; - } - } + addresses to IPv6 addresses, so we use the no_inet6 + function variant. */ + res_ctx = __resolv_context_get (); + res_enable_inet6 = __resolv_context_disable_inet6 (res_ctx); + if (res_ctx == NULL) + no_more = 1; while (!no_more) { @@ -854,44 +765,31 @@ gaih_inet (const char *name, const struct gaih_service *service, if (fct4 != NULL) { - int herrno; - while (1) { - rc = 0; - status = DL_CALL_FCT (fct4, (name, pat, tmpbuf, - tmpbuflen, &rc, &herrno, + status = DL_CALL_FCT (fct4, (name, pat, + tmpbuf->data, tmpbuf->length, + &errno, &h_errno, NULL)); if (status == NSS_STATUS_SUCCESS) break; if (status != NSS_STATUS_TRYAGAIN - || rc != ERANGE || herrno != NETDB_INTERNAL) + || errno != ERANGE || h_errno != NETDB_INTERNAL) { - if (herrno == TRY_AGAIN) + if (h_errno == TRY_AGAIN) no_data = EAI_AGAIN; else - no_data = herrno == NO_DATA; + no_data = h_errno == NO_DATA; break; } - if (!malloc_tmpbuf - && __libc_use_alloca (alloca_used + 2 * tmpbuflen)) - tmpbuf = extend_alloca_account (tmpbuf, tmpbuflen, - 2 * tmpbuflen, - alloca_used); - else + if (!scratch_buffer_grow (tmpbuf)) { - char *newp = realloc (malloc_tmpbuf ? tmpbuf : NULL, - 2 * tmpbuflen); - if (newp == NULL) - { - _res.options |= old_res_options & RES_USE_INET6; - result = -EAI_MEMORY; - goto free_and_return; - } - tmpbuf = newp; - malloc_tmpbuf = true; - tmpbuflen = 2 * tmpbuflen; + __resolv_context_enable_inet6 + (res_ctx, res_enable_inet6); + __resolv_context_put (res_ctx); + result = -EAI_MEMORY; + goto free_and_return; } } @@ -985,54 +883,16 @@ gaih_inet (const char *name, const struct gaih_service *service, 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) + canonbuf = getcanonname (nip, at, name); + if (canonbuf == NULL) { - const size_t max_fqdn_len = 256; - if ((req->ai_flags & AI_CANONIDN) != 0 - && __libc_use_alloca (alloca_used - + max_fqdn_len)) - canonbuf = alloca_account (max_fqdn_len, - alloca_used); - else - { - canonbuf = malloc (max_fqdn_len); - if (canonbuf == NULL) - { - _res.options - |= old_res_options & RES_USE_INET6; - result = -EAI_MEMORY; - goto free_and_return; - } - malloc_canonbuf = true; - } - char *s; - - if (DL_CALL_FCT (cfct, (at->name ?: name, - canonbuf, - max_fqdn_len, - &s, &rc, &herrno)) - == NSS_STATUS_SUCCESS) - canon = s; - else - { - /* If the canonical name cannot be - determined, use the passed in - string. */ - if (malloc_canonbuf) - { - free (canonbuf); - malloc_canonbuf = false; - } - canon = name; - } + __resolv_context_enable_inet6 + (res_ctx, res_enable_inet6); + __resolv_context_put (res_ctx); + result = -EAI_MEMORY; + goto free_and_return; } + canon = canonbuf; } status = NSS_STATUS_SUCCESS; } @@ -1049,13 +909,17 @@ gaih_inet (const char *name, const struct gaih_service *service, } else { + /* Could not locate any of the lookup functions. + The NSS lookup code does not consistently set + errno, so we need to supply our own error + code here. The root cause could either be a + resource allocation failure, or a missing + service function in the DSO (so it should not + be listed in /etc/nsswitch.conf). Assume the + former, and return EBUSY. */ status = NSS_STATUS_UNAVAIL; - /* Could not load any of the lookup functions. Indicate - an internal error if the failure was due to a system - error other than the file not being found. We use the - errno from the last failed callback. */ - if (errno != 0 && errno != ENOENT) - __set_h_errno (NETDB_INTERNAL); + __set_h_errno (NETDB_INTERNAL); + __set_errno (EBUSY); } } @@ -1068,9 +932,13 @@ gaih_inet (const char *name, const struct gaih_service *service, nip = nip->next; } - _res.options |= old_res_options & RES_USE_INET6; + __resolv_context_enable_inet6 (res_ctx, res_enable_inet6); + __resolv_context_put (res_ctx); - if (h_errno == NETDB_INTERNAL) + /* If we have a failure which sets errno, report it using + EAI_SYSTEM. */ + if ((status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL) + && h_errno == NETDB_INTERNAL) { result = -EAI_SYSTEM; goto free_and_return; @@ -1144,46 +1012,31 @@ gaih_inet (const char *name, const struct gaih_service *service, the passed in string. */ canon = orig_name; -#ifdef HAVE_LIBIDN - if (req->ai_flags & AI_CANONIDN) + bool do_idn = req->ai_flags & AI_CANONIDN; + if (do_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 *out; - int rc = __idna_to_unicode_lzlz (canon, &out, idn_flags); - if (rc != IDNA_SUCCESS) + int rc = __idna_from_dns_encoding (canon, &out); + if (rc == 0) + canon = out; + else if (rc == EAI_IDN_ENCODE) + /* Use the punycode name as a fallback. */ + do_idn = false; + else { - if (rc == IDNA_MALLOC_ERROR) - result = -EAI_MEMORY; - else if (rc == IDNA_DLOPEN_ERROR) - result = -EAI_SYSTEM; - else - result = -EAI_IDN_ENCODE; + result = -rc; goto free_and_return; } - /* In case the output string is the same as the input - string no new string has been allocated and we - make a copy. */ - if (out == canon) - goto make_copy; - canon = out; } - else -#endif + if (!do_idn) { -#ifdef HAVE_LIBIDN - make_copy: -#endif - if (malloc_canonbuf) - /* We already allocated the string using malloc. */ - malloc_canonbuf = false; + if (canonbuf != NULL) + /* We already allocated the string using malloc, but + the buffer is now owned by canon. */ + canonbuf = NULL; else { - canon = strdup (canon); + canon = __strdup (canon); if (canon == NULL) { result = -EAI_MEMORY; @@ -1274,12 +1127,8 @@ gaih_inet (const char *name, const struct gaih_service *service, free_and_return: if (malloc_name) free ((char *) name); - if (malloc_addrmem) - free (addrmem); - if (malloc_canonbuf) - free (canonbuf); - if (malloc_tmpbuf) - free (tmpbuf); + free (addrmem); + free (canonbuf); return result; } @@ -2341,10 +2190,7 @@ getaddrinfo (const char *name, const char *service, 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_IDN|AI_CANONIDN|DEPRECATED_AI_IDN |AI_NUMERICSERV|AI_ALL)) return EAI_BADFLAGS; @@ -2414,7 +2260,11 @@ getaddrinfo (const char *name, const char *service, if (hints->ai_family == AF_UNSPEC || hints->ai_family == AF_INET || hints->ai_family == AF_INET6) { - last_i = gaih_inet (name, pservice, hints, end, &naddrs); + struct scratch_buffer tmpbuf; + scratch_buffer_init (&tmpbuf); + last_i = gaih_inet (name, pservice, hints, end, &naddrs, &tmpbuf); + scratch_buffer_free (&tmpbuf); + if (last_i != 0) { freeaddrinfo (p); @@ -2510,9 +2360,9 @@ getaddrinfo (const char *name, const char *service, { if (fd != -1) close_retry: - close_not_cancel_no_status (fd); + __close_nocancel_nostatus (fd); af = q->ai_family; - fd = __socket (af, SOCK_DGRAM, IPPROTO_IP); + fd = __socket (af, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_IP); } else { @@ -2613,7 +2463,7 @@ getaddrinfo (const char *name, const char *service, } if (fd != -1) - close_not_cancel_no_status (fd); + __close_nocancel_nostatus (fd); /* We got all the source addresses we can get, now sort using the information. */ |