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gaih_inet: split loopback lookup into its own function

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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>
Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Siddhesh Poyarekar 2022-03-07 20:24:37 +05:30
parent cfa3bd48cb
commit 657472b2a5
1 changed files with 62 additions and 65 deletions
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127
sysdeps/posix/getaddrinfo.c
View File

@ -1004,6 +1004,32 @@ 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,
@ -1014,10 +1040,6 @@ 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;
@ -1027,76 +1049,51 @@ 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;
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 (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:
{