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gai-merge-continue-actions.patch
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File gai-merge-continue-actions.patch of Package glibc
From 96e523383fc409779172be312576d2c359761047 Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar <siddhesh@sourceware.org> Date: Thu, 17 Mar 2022 11:44:34 +0530 Subject: [PATCH] Simplify allocations and fix merge and continue actions [BZ #28931] Allocations for address tuples is currently a bit confusing because of the pointer chasing through PAT, making it hard to observe the sequence in which allocations have been made. Narrow scope of the pointer chasing through PAT so that it is only used where necessary. This also tightens actions behaviour with the hosts database in getaddrinfo to comply with the manual text. The "continue" action discards previous results and the "merge" action results in an immedate lookup failure. Consequently, chaining of allocations across modules is no longer necessary, thus opening up cleanup opportunities. A test has been added that checks some combinations to ensure that they work correctly. Resolves: BZ #28931 Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: DJ Delorie <dj@redhat.com> (cherry picked from commit 1c37b8022e8763fedbb3f79c02e05c6acfe5a215) --- nss/Makefile | 3 +- nss/tst-nss-gai-actions.c | 150 ++++++ nss/tst-nss-gai-actions.root/etc/host.conf | 1 + nss/tst-nss-gai-actions.root/etc/hosts | 508 +++++++++++++++++++++ sysdeps/posix/getaddrinfo.c | 140 +++--- 5 files changed, 749 insertions(+), 53 deletions(-) create mode 100644 nss/tst-nss-gai-actions.c create mode 100644 nss/tst-nss-gai-actions.root/etc/host.conf create mode 100644 nss/tst-nss-gai-actions.root/etc/hosts diff --git a/nss/Makefile b/nss/Makefile index 39febe8654..bd6283927c 100644 --- a/nss/Makefile +++ b/nss/Makefile @@ -64,7 +64,8 @@ tests-container = \ tst-nss-files-hosts-long \ tst-nss-files-hosts-v4mapped \ tst-nss-db-endpwent \ - tst-nss-db-endgrent + tst-nss-db-endgrent \ + tst-nss-gai-actions # Tests which need libdl ifeq (yes,$(build-shared)) diff --git a/nss/tst-nss-gai-actions.c b/nss/tst-nss-gai-actions.c new file mode 100644 index 0000000000..880de5027c --- /dev/null +++ b/nss/tst-nss-gai-actions.c @@ -0,0 +1,150 @@ +/* Test continue and merge NSS actions for getaddrinfo. + Copyright The GNU Toolchain Authors. + 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 + <https://www.gnu.org/licenses/>. */ + +#include <dlfcn.h> +#include <gnu/lib-names.h> +#include <nss.h> +#include <stdio.h> +#include <stdbool.h> +#include <stdlib.h> +#include <string.h> + +#include <support/check.h> +#include <support/format_nss.h> +#include <support/support.h> +#include <support/xstdio.h> +#include <support/xunistd.h> + +enum +{ + ACTION_MERGE = 0, + ACTION_CONTINUE, +}; + +static const char * +family_str (int family) +{ + switch (family) + { + case AF_UNSPEC: + return "AF_UNSPEC"; + case AF_INET: + return "AF_INET"; + default: + __builtin_unreachable (); + } +} + +static const char * +action_str (int action) +{ + switch (action) + { + case ACTION_MERGE: + return "merge"; + case ACTION_CONTINUE: + return "continue"; + default: + __builtin_unreachable (); + } +} + +static void +do_one_test (int action, int family, bool canon) +{ + struct addrinfo hints = + { + .ai_family = family, + }; + + struct addrinfo *ai; + + if (canon) + hints.ai_flags = AI_CANONNAME; + + printf ("***** Testing \"files [SUCCESS=%s] files\" for family %s, %s\n", + action_str (action), family_str (family), + canon ? "AI_CANONNAME" : ""); + + int ret = getaddrinfo ("example.org", "80", &hints, &ai); + + switch (action) + { + case ACTION_MERGE: + if (ret == 0) + { + char *formatted = support_format_addrinfo (ai, ret); + + printf ("merge unexpectedly succeeded:\n %s\n", formatted); + support_record_failure (); + free (formatted); + } + else + return; + case ACTION_CONTINUE: + { + char *formatted = support_format_addrinfo (ai, ret); + + /* Verify that the result appears exactly once. */ + const char *expected = "address: STREAM/TCP 192.0.0.1 80\n" + "address: DGRAM/UDP 192.0.0.1 80\n" + "address: RAW/IP 192.0.0.1 80\n"; + + const char *contains = strstr (formatted, expected); + const char *contains2 = NULL; + + if (contains != NULL) + contains2 = strstr (contains + strlen (expected), expected); + + if (contains == NULL || contains2 != NULL) + { + printf ("continue failed:\n%s\n", formatted); + support_record_failure (); + } + + free (formatted); + break; + } + default: + __builtin_unreachable (); + } +} + +static void +do_one_test_set (int action) +{ + char buf[32]; + + snprintf (buf, sizeof (buf), "files [SUCCESS=%s] files", + action_str (action)); + __nss_configure_lookup ("hosts", buf); + + do_one_test (action, AF_UNSPEC, false); + do_one_test (action, AF_INET, false); + do_one_test (action, AF_INET, true); +} + +static int +do_test (void) +{ + do_one_test_set (ACTION_CONTINUE); + do_one_test_set (ACTION_MERGE); + return 0; +} + +#include <support/test-driver.c> diff --git a/nss/tst-nss-gai-actions.root/etc/host.conf b/nss/tst-nss-gai-actions.root/etc/host.conf new file mode 100644 index 0000000000..d1a59f73a9 --- /dev/null +++ b/nss/tst-nss-gai-actions.root/etc/host.conf @@ -0,0 +1 @@ +multi on diff --git a/nss/tst-nss-gai-actions.root/etc/hosts b/nss/tst-nss-gai-actions.root/etc/hosts new file mode 100644 index 0000000000..50ce9774dc --- /dev/null +++ b/nss/tst-nss-gai-actions.root/etc/hosts @@ -0,0 +1,508 @@ +192.0.0.1 example.org +192.0.0.2 example.org +192.0.0.3 example.org 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+192.0.1.237 example.org +192.0.1.238 example.org +192.0.1.239 example.org +192.0.1.240 example.org +192.0.1.241 example.org +192.0.1.242 example.org +192.0.1.243 example.org +192.0.1.244 example.org +192.0.1.245 example.org +192.0.1.246 example.org +192.0.1.247 example.org +192.0.1.248 example.org +192.0.1.249 example.org +192.0.1.250 example.org +192.0.1.251 example.org +192.0.1.252 example.org +192.0.1.253 example.org +192.0.1.254 example.org diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c index 538691a598..c38b4ce93b 100644 --- a/sysdeps/posix/getaddrinfo.c +++ b/sysdeps/posix/getaddrinfo.c @@ -470,11 +470,6 @@ gaih_inet (const char *name, const struct gaih_service *service, if (name != NULL) { - at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); - at->family = AF_UNSPEC; - at->scopeid = 0; - at->next = NULL; - if (req->ai_flags & AI_IDN) { char *out; @@ -485,13 +480,21 @@ gaih_inet (const char *name, const struct gaih_service *service, malloc_name = true; } - if (__inet_aton_exact (name, (struct in_addr *) at->addr) != 0) + uint32_t addr[4]; + if (__inet_aton_exact (name, (struct in_addr *) addr) != 0) { + at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used); + at->scopeid = 0; + at->next = NULL; + if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET) - at->family = AF_INET; + { + memcpy (at->addr, addr, sizeof (at->addr)); + at->family = AF_INET; + } else if (req->ai_family == AF_INET6 && (req->ai_flags & AI_V4MAPPED)) { - at->addr[3] = at->addr[0]; + at->addr[3] = addr[0]; at->addr[2] = htonl (0xffff); at->addr[1] = 0; at->addr[0] = 0; @@ -505,49 +508,59 @@ gaih_inet (const char *name, const struct gaih_service *service, if (req->ai_flags & AI_CANONNAME) canon = name; + + goto process_list; } - else if (at->family == AF_UNSPEC) + + char *scope_delim = strchr (name, SCOPE_DELIMITER); + int e; + + if (scope_delim == NULL) + e = inet_pton (AF_INET6, name, addr); + else + e = __inet_pton_length (AF_INET6, name, scope_delim - name, addr); + + if (e > 0) { - char *scope_delim = strchr (name, SCOPE_DELIMITER); - int e; - if (scope_delim == NULL) - e = inet_pton (AF_INET6, name, at->addr); + at = alloca_account (sizeof (struct gaih_addrtuple), + alloca_used); + at->scopeid = 0; + at->next = NULL; + + if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) + { + memcpy (at->addr, addr, sizeof (at->addr)); + at->family = AF_INET6; + } + else if (req->ai_family == AF_INET + && IN6_IS_ADDR_V4MAPPED (addr)) + { + at->addr[0] = addr[3]; + at->family = AF_INET; + } 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) - at->family = AF_INET6; - else if (req->ai_family == AF_INET - && IN6_IS_ADDR_V4MAPPED (at->addr)) - { - at->addr[0] = at->addr[3]; - at->family = AF_INET; - } - else - { - result = -EAI_ADDRFAMILY; - goto free_and_return; - } - - if (scope_delim != NULL - && __inet6_scopeid_pton ((struct in6_addr *) at->addr, - scope_delim + 1, - &at->scopeid) != 0) - { - result = -EAI_NONAME; - goto free_and_return; - } + result = -EAI_ADDRFAMILY; + goto free_and_return; + } - if (req->ai_flags & AI_CANONNAME) - canon = name; + if (scope_delim != NULL + && __inet6_scopeid_pton ((struct in6_addr *) at->addr, + scope_delim + 1, + &at->scopeid) != 0) + { + result = -EAI_NONAME; + goto free_and_return; } + + if (req->ai_flags & AI_CANONNAME) + canon = name; + + goto process_list; } - if (at->family == AF_UNSPEC && (req->ai_flags & AI_NUMERICHOST) == 0) + if ((req->ai_flags & AI_NUMERICHOST) == 0) { - struct gaih_addrtuple **pat = &at; int no_data = 0; int no_inet6_data = 0; service_user *nip; @@ -555,6 +568,7 @@ gaih_inet (const char *name, const struct gaih_service *service, enum nss_status status = NSS_STATUS_UNAVAIL; int no_more; struct resolv_context *res_ctx = NULL; + bool do_merge = false; /* If we do not have to look for IPv6 addresses or the canonical name, use the simple, old functions, which do not support @@ -591,7 +605,7 @@ gaih_inet (const char *name, const struct gaih_service *service, result = -EAI_MEMORY; goto free_and_return; } - *pat = addrmem; + at = addrmem; } else { @@ -644,6 +658,8 @@ gaih_inet (const char *name, const struct gaih_service *service, } struct gaih_addrtuple *addrfree = addrmem; + struct gaih_addrtuple **pat = &at; + for (int i = 0; i < air->naddrs; ++i) { socklen_t size = (air->family[i] == AF_INET @@ -707,12 +723,6 @@ gaih_inet (const char *name, const struct gaih_service *service, free (air); - if (at->family == AF_UNSPEC) - { - result = -EAI_NONAME; - goto free_and_return; - } - goto process_list; } else if (err == 0) @@ -750,6 +760,22 @@ gaih_inet (const char *name, const struct gaih_service *service, while (!no_more) { + /* Always start afresh; continue should discard previous results + and the hosts database does not support merge. */ + at = NULL; + free (canonbuf); + free (addrmem); + canon = canonbuf = NULL; + addrmem = NULL; + got_ipv6 = false; + + if (do_merge) + { + __set_h_errno (NETDB_INTERNAL); + __set_errno (EBUSY); + break; + } + no_data = 0; nss_gethostbyname4_r fct4 = NULL; @@ -762,12 +788,14 @@ gaih_inet (const char *name, const struct gaih_service *service, { while (1) { - status = DL_CALL_FCT (fct4, (name, pat, + status = DL_CALL_FCT (fct4, (name, &at, tmpbuf->data, tmpbuf->length, &errno, &h_errno, NULL)); if (status == NSS_STATUS_SUCCESS) break; + /* gethostbyname4_r may write into AT, so reset it. */ + at = NULL; if (status != NSS_STATUS_TRYAGAIN || errno != ERANGE || h_errno != NETDB_INTERNAL) { @@ -792,7 +820,9 @@ gaih_inet (const char *name, const struct gaih_service *service, no_data = 1; if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL) - canon = (*pat)->name; + canon = at->name; + + struct gaih_addrtuple **pat = &at; while (*pat != NULL) { @@ -844,6 +874,8 @@ gaih_inet (const char *name, const struct gaih_service *service, if (fct != NULL) { + struct gaih_addrtuple **pat = &at; + if (req->ai_family == AF_INET6 || req->ai_family == AF_UNSPEC) { @@ -917,6 +949,10 @@ gaih_inet (const char *name, const struct gaih_service *service, if (nss_next_action (nip, status) == NSS_ACTION_RETURN) break; + /* The hosts database does not support MERGE. */ + if (nss_next_action (nip, status) == NSS_ACTION_MERGE) + do_merge = true; + if (nip->next == NULL) no_more = -1; else @@ -949,7 +985,7 @@ gaih_inet (const char *name, const struct gaih_service *service, } process_list: - if (at->family == AF_UNSPEC) + if (at == NULL) { result = -EAI_NONAME; goto free_and_return; -- 2.42.0
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