From: Siddhesh Poyarekar <siddhesh@sourceware.org>
To: libc-alpha@sourceware.org
Subject: [PATCH v2 10/12] gaih_inet: split loopback lookup into its own function
Date: Mon, 14 Mar 2022 15:18:33 +0530 [thread overview]
Message-ID: <20220314094835.1159523-11-siddhesh@sourceware.org> (raw)
In-Reply-To: <20220314094835.1159523-1-siddhesh@sourceware.org>
Flatten the condition nesting and replace the alloca for RET.AT/ATR with
a single array LOCAL_AT[2]. This gets rid of alloca and alloca
accounting.
`git diff -b` is probably the best way to view this change since much of
the diff is whitespace changes.
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
---
sysdeps/posix/getaddrinfo.c | 127 ++++++++++++++++++------------------
1 file changed, 62 insertions(+), 65 deletions(-)
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index e71f21f3c9..3aeeb0d1e0 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -1002,6 +1002,32 @@ try_simple_gethostbyname (const char *name, const struct addrinfo *req,
return -EAI_NODATA;
}
+/* Add local address information into RES. RES->AT is assumed to have enough
+ space for two tuples and is zeroed out. */
+
+static void
+get_local_addresses (const struct addrinfo *req, struct gaih_result *res)
+{
+ struct gaih_addrtuple *atr = res->at;
+ if (req->ai_family == AF_UNSPEC)
+ res->at->next = res->at + 1;
+
+ if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
+ {
+ res->at->family = AF_INET6;
+ if ((req->ai_flags & AI_PASSIVE) == 0)
+ memcpy (res->at->addr, &in6addr_loopback, sizeof (struct in6_addr));
+ atr = res->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);
+ }
+}
+
static int
gaih_inet (const char *name, const struct gaih_service *service,
const struct addrinfo *req, struct addrinfo **pai,
@@ -1012,10 +1038,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
const char *orig_name = name;
- /* Reserve stack memory for the scratch buffer in the getaddrinfo
- function. */
- size_t alloca_used = sizeof (struct scratch_buffer);
-
int rc;
if ((rc = get_servtuples (service, req, st, tmpbuf)) != 0)
return rc;
@@ -1025,76 +1047,51 @@ gaih_inet (const char *name, const struct gaih_service *service,
int result = 0;
struct gaih_result res = {0};
- if (name != NULL)
+ struct gaih_addrtuple local_at[2] = {0};
+
+ res.at = local_at;
+
+ if (__glibc_unlikely (name == NULL))
{
- if (req->ai_flags & AI_IDN)
- {
- char *out;
- result = __idna_to_dns_encoding (name, &out);
- if (result != 0)
- return -result;
- name = out;
- malloc_name = true;
- }
+ get_local_addresses (req, &res);
+ goto process_list;
+ }
- res.at = alloca_account (sizeof (struct gaih_addrtuple), alloca_used);
- res.at->scopeid = 0;
- res.at->next = NULL;
+ if (req->ai_flags & AI_IDN)
+ {
+ char *out;
+ result = __idna_to_dns_encoding (name, &out);
+ if (result != 0)
+ return -result;
+ name = out;
+ malloc_name = true;
+ }
- if ((result = text_to_binary_address (name, req, &res)) != 0)
- goto free_and_return;
- else if (res.at != NULL)
- goto process_list;
+ if ((result = text_to_binary_address (name, req, &res)) != 0)
+ goto free_and_return;
+ else if (res.at != NULL)
+ goto process_list;
- if ((result = try_simple_gethostbyname (name, req, tmpbuf, &res)) != 0)
- goto free_and_return;
- else if (res.at != NULL)
- goto process_list;
+ if ((result = try_simple_gethostbyname (name, req, tmpbuf, &res)) != 0)
+ goto free_and_return;
+ else if (res.at != NULL)
+ goto process_list;
#ifdef USE_NSCD
- if ((result = get_nscd_addresses (name, req, &res)) != 0)
- goto free_and_return;
- else if (res.at != NULL)
- goto process_list;
+ if ((result = get_nscd_addresses (name, req, &res)) != 0)
+ goto free_and_return;
+ else if (res.at != NULL)
+ goto process_list;
#endif
- if ((result = get_nss_addresses (name, req, tmpbuf, &res)) != 0)
- goto free_and_return;
- else if (res.at != NULL)
- goto process_list;
-
- /* None of the lookups worked, so name not found. */
- result = -EAI_NONAME;
- goto free_and_return;
- }
- else
- {
- struct gaih_addrtuple *atr;
- atr = res.at = alloca_account (sizeof (struct gaih_addrtuple),
- alloca_used);
- memset (res.at, '\0', sizeof (struct gaih_addrtuple));
-
- if (req->ai_family == AF_UNSPEC)
- {
- res.at->next = __alloca (sizeof (struct gaih_addrtuple));
- memset (res.at->next, '\0', sizeof (struct gaih_addrtuple));
- }
-
- if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
- {
- res.at->family = AF_INET6;
- if ((req->ai_flags & AI_PASSIVE) == 0)
- memcpy (res.at->addr, &in6addr_loopback, sizeof (struct in6_addr));
- atr = res.at->next;
- }
+ if ((result = get_nss_addresses (name, req, tmpbuf, &res)) != 0)
+ goto free_and_return;
+ else if (res.at != NULL)
+ goto process_list;
- 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);
- }
- }
+ /* None of the lookups worked, so name not found. */
+ result = -EAI_NONAME;
+ goto free_and_return;
process_list:
{
--
2.35.1
next prev parent reply other threads:[~2022-03-14 9:49 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-08 10:07 [PATCH 00/12] getaddrinfo facelift and fixes Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 01/12] Simplify allocations and fix merge and continue actions [BZ #28931] Siddhesh Poyarekar
2022-03-08 13:52 ` Siddhesh Poyarekar
2022-03-08 21:12 ` Carlos O'Donell
2022-03-09 17:13 ` Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 02/12] gaih_inet: Simplify canon name resolution Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 03/12] getaddrinfo: Fix leak with AI_ALL [BZ #28852] Siddhesh Poyarekar
2022-03-08 11:00 ` Andreas Schwab
2022-03-08 13:45 ` Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 04/12] gaih_inet: Simplify service resolution Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 05/12] gaih_inet: make numeric lookup a separate routine Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 06/12] gaih_inet: Split simple gethostbyname into its own function Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 07/12] gaih_inet: Split nscd lookup code " Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 08/12] gaih_inet: separate nss lookup loop " Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 09/12] gaih_inet: make gethosts into a function Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 10/12] gaih_inet: split loopback lookup into its own function Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 11/12] gaih_inet: Split result generation " Siddhesh Poyarekar
2022-03-08 10:07 ` [PATCH 12/12] gethosts: Return EAI_MEMORY on allocation failure Siddhesh Poyarekar
2022-03-14 9:48 ` [PATCH v2 00/12] getaddrinfo facelift and fixes Siddhesh Poyarekar
2022-03-14 9:48 ` [PATCH v2 01/12] Simplify allocations and fix merge and continue actions [BZ #28931] Siddhesh Poyarekar
2022-03-14 10:30 ` Andreas Schwab
2022-03-14 14:15 ` Siddhesh Poyarekar
2022-03-16 20:47 ` DJ Delorie
2022-03-17 1:39 ` Siddhesh Poyarekar
2022-03-14 9:48 ` [PATCH v2 02/12] gaih_inet: Simplify canon name resolution Siddhesh Poyarekar
2022-03-16 21:12 ` DJ Delorie
2022-03-14 9:48 ` [PATCH v2 03/12] getaddrinfo: Fix leak with AI_ALL [BZ #28852] Siddhesh Poyarekar
2022-03-16 23:42 ` DJ Delorie
2022-03-17 2:30 ` Siddhesh Poyarekar
2022-03-14 9:48 ` [PATCH v2 04/12] gaih_inet: Simplify service resolution Siddhesh Poyarekar
2022-03-17 0:48 ` DJ Delorie
2022-03-14 9:48 ` [PATCH v2 05/12] gaih_inet: make numeric lookup a separate routine Siddhesh Poyarekar
2022-03-17 4:10 ` DJ Delorie
2022-03-14 9:48 ` [PATCH v2 06/12] gaih_inet: Split simple gethostbyname into its own function Siddhesh Poyarekar
2022-03-17 4:20 ` DJ Delorie
2022-03-14 9:48 ` [PATCH v2 07/12] gaih_inet: Split nscd lookup code " Siddhesh Poyarekar
2022-03-17 4:31 ` DJ Delorie
2022-03-17 6:22 ` Siddhesh Poyarekar
2022-03-14 9:48 ` [PATCH v2 08/12] gaih_inet: separate nss lookup loop " Siddhesh Poyarekar
2022-03-17 4:42 ` DJ Delorie
2022-03-17 4:59 ` Siddhesh Poyarekar
2022-03-14 9:48 ` [PATCH v2 09/12] gaih_inet: make gethosts into a function Siddhesh Poyarekar
2022-03-17 4:44 ` DJ Delorie
2022-03-14 9:48 ` Siddhesh Poyarekar [this message]
2022-03-17 4:51 ` [PATCH v2 10/12] gaih_inet: split loopback lookup into its own function DJ Delorie
2022-03-14 9:48 ` [PATCH v2 11/12] gaih_inet: Split result generation " Siddhesh Poyarekar
2022-03-17 5:05 ` DJ Delorie
2022-03-17 5:11 ` Siddhesh Poyarekar
2022-03-14 9:48 ` [PATCH v2 12/12] gethosts: Return EAI_MEMORY on allocation failure Siddhesh Poyarekar
2022-03-17 5:06 ` DJ Delorie
2022-03-14 13:21 ` [PATCH 00/12] getaddrinfo facelift and fixes Cristian Rodríguez
2022-03-14 14:16 ` Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 " Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 01/12] Simplify allocations and fix merge and continue actions [BZ #28931] Siddhesh Poyarekar
2022-03-17 21:47 ` DJ Delorie
2022-03-17 8:11 ` [PATCH v3 02/12] gaih_inet: Simplify canon name resolution Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 03/12] getaddrinfo: Fix leak with AI_ALL [BZ #28852] Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 04/12] gaih_inet: Simplify service resolution Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 05/12] gaih_inet: make numeric lookup a separate routine Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 06/12] gaih_inet: Split simple gethostbyname into its own function Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 07/12] gaih_inet: Split nscd lookup code " Siddhesh Poyarekar
2022-03-17 22:02 ` DJ Delorie
2022-03-17 8:11 ` [PATCH v3 08/12] gaih_inet: separate nss lookup loop " Siddhesh Poyarekar
2022-03-17 22:05 ` DJ Delorie
2022-03-17 8:11 ` [PATCH v3 09/12] gaih_inet: make gethosts into a function Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 10/12] gaih_inet: split loopback lookup into its own function Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 11/12] gaih_inet: Split result generation " Siddhesh Poyarekar
2022-03-17 8:11 ` [PATCH v3 12/12] gethosts: Return EAI_MEMORY on allocation failure Siddhesh Poyarekar
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