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gaih_inet: Simplify canon name resolution

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Simplify logic for allocation of canon to remove the canonbuf variable;
canon now always points to an allocated block.  Also pull the canon name
set into a separate function.

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 22:17:36 +05:30
parent 1c37b8022e
commit d01411f6bc
1 changed files with 75 additions and 55 deletions
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130
sysdeps/posix/getaddrinfo.c
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@ -285,7 +285,7 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
\ \
if (localcanon != NULL && canon == NULL) \ if (localcanon != NULL && canon == NULL) \
{ \ { \
canonbuf = __strdup (localcanon); \ char *canonbuf = __strdup (localcanon); \
if (canonbuf == NULL) \ if (canonbuf == NULL) \
{ \ { \
__resolv_context_put (res_ctx); \ __resolv_context_put (res_ctx); \
@ -323,6 +323,41 @@ getcanonname (nss_action_list nip, struct gaih_addrtuple *at, const char *name)
return __strdup (name); return __strdup (name);
} }
/* Process looked up canonical name and if necessary, decode to IDNA. Result
is a new string written to CANONP and the earlier string is freed. */
static int
process_canonname (const struct addrinfo *req, const char *orig_name,
char **canonp)
{
char *canon = *canonp;
if ((req->ai_flags & AI_CANONNAME) != 0)
{
bool do_idn = req->ai_flags & AI_CANONIDN;
if (do_idn)
{
char *out;
int rc = __idna_from_dns_encoding (canon ?: orig_name, &out);
if (rc == 0)
{
free (canon);
canon = out;
}
else if (rc == EAI_IDN_ENCODE)
/* Use the punycode name as a fallback. */
do_idn = false;
else
return -rc;
}
if (!do_idn && canon == NULL && (canon = __strdup (orig_name)) == NULL)
return -EAI_MEMORY;
}
*canonp = canon;
return 0;
}
static int static int
gaih_inet (const char *name, const struct gaih_service *service, gaih_inet (const char *name, const struct gaih_service *service,
const struct addrinfo *req, struct addrinfo **pai, const struct addrinfo *req, struct addrinfo **pai,
@ -332,7 +367,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv; struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv;
struct gaih_addrtuple *at = NULL; struct gaih_addrtuple *at = NULL;
bool got_ipv6 = false; bool got_ipv6 = false;
const char *canon = NULL; char *canon = NULL;
const char *orig_name = name; const char *orig_name = name;
/* Reserve stack memory for the scratch buffer in the getaddrinfo /* Reserve stack memory for the scratch buffer in the getaddrinfo
@ -453,7 +488,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
bool malloc_name = false; bool malloc_name = false;
struct gaih_addrtuple *addrmem = NULL; struct gaih_addrtuple *addrmem = NULL;
char *canonbuf = NULL;
int result = 0; int result = 0;
if (name != NULL) if (name != NULL)
@ -495,7 +529,15 @@ gaih_inet (const char *name, const struct gaih_service *service,
} }
if (req->ai_flags & AI_CANONNAME) if (req->ai_flags & AI_CANONNAME)
canon = name; {
char *canonbuf = __strdup (name);
if (canonbuf == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
canon = canonbuf;
}
goto process_list; goto process_list;
} }
@ -545,7 +587,15 @@ gaih_inet (const char *name, const struct gaih_service *service,
} }
if (req->ai_flags & AI_CANONNAME) if (req->ai_flags & AI_CANONNAME)
canon = name; {
char *canonbuf = __strdup (name);
if (canonbuf == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
canon = canonbuf;
}
goto process_list; goto process_list;
} }
@ -676,9 +726,9 @@ gaih_inet (const char *name, const struct gaih_service *service,
(*pat)->next = NULL; (*pat)->next = NULL;
if (added_canon || air->canon == NULL) if (added_canon || air->canon == NULL)
(*pat)->name = NULL; (*pat)->name = NULL;
else if (canonbuf == NULL) else if (canon == NULL)
{ {
canonbuf = __strdup (air->canon); char *canonbuf = __strdup (air->canon);
if (canonbuf == NULL) if (canonbuf == NULL)
{ {
result = -EAI_MEMORY; result = -EAI_MEMORY;
@ -748,9 +798,9 @@ gaih_inet (const char *name, const struct gaih_service *service,
/* Always start afresh; continue should discard previous results /* Always start afresh; continue should discard previous results
and the hosts database does not support merge. */ and the hosts database does not support merge. */
at = NULL; at = NULL;
free (canonbuf); free (canon);
free (addrmem); free (addrmem);
canon = canonbuf = NULL; canon = NULL;
addrmem = NULL; addrmem = NULL;
got_ipv6 = false; got_ipv6 = false;
@ -805,7 +855,16 @@ gaih_inet (const char *name, const struct gaih_service *service,
no_data = 1; no_data = 1;
if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL) if ((req->ai_flags & AI_CANONNAME) != 0 && canon == NULL)
canon = at->name; {
char *canonbuf = __strdup (at->name);
if (canonbuf == NULL)
{
__resolv_context_put (res_ctx);
result = -EAI_MEMORY;
goto free_and_return;
}
canon = canonbuf;
}
struct gaih_addrtuple **pat = &at; struct gaih_addrtuple **pat = &at;
@ -893,7 +952,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
if ((req->ai_flags & AI_CANONNAME) != 0 if ((req->ai_flags & AI_CANONNAME) != 0
&& canon == NULL) && canon == NULL)
{ {
canonbuf = getcanonname (nip, at, name); char *canonbuf = getcanonname (nip, at, name);
if (canonbuf == NULL) if (canonbuf == NULL)
{ {
__resolv_context_put (res_ctx); __resolv_context_put (res_ctx);
@ -1004,6 +1063,10 @@ gaih_inet (const char *name, const struct gaih_service *service,
} }
{ {
/* Set up the canonical name if we need it. */
if ((result = process_canonname (req, orig_name, &canon)) != 0)
goto free_and_return;
struct gaih_servtuple *st2; struct gaih_servtuple *st2;
struct gaih_addrtuple *at2 = at; struct gaih_addrtuple *at2 = at;
size_t socklen; size_t socklen;
@ -1014,48 +1077,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
*/ */
while (at2 != NULL) while (at2 != NULL)
{ {
/* Only the first entry gets the canonical name. */
if (at2 == at && (req->ai_flags & AI_CANONNAME) != 0)
{
if (canon == NULL)
/* If the canonical name cannot be determined, use
the passed in string. */
canon = orig_name;
bool do_idn = req->ai_flags & AI_CANONIDN;
if (do_idn)
{
char *out;
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
{
result = -rc;
goto free_and_return;
}
}
if (!do_idn)
{
if (canonbuf != NULL)
/* We already allocated the string using malloc, but
the buffer is now owned by canon. */
canonbuf = NULL;
else
{
canon = __strdup (canon);
if (canon == NULL)
{
result = -EAI_MEMORY;
goto free_and_return;
}
}
}
}
family = at2->family; family = at2->family;
if (family == AF_INET6) if (family == AF_INET6)
{ {
@ -1078,7 +1099,6 @@ gaih_inet (const char *name, const struct gaih_service *service,
ai = *pai = malloc (sizeof (struct addrinfo) + socklen); ai = *pai = malloc (sizeof (struct addrinfo) + socklen);
if (ai == NULL) if (ai == NULL)
{ {
free ((char *) canon);
result = -EAI_MEMORY; result = -EAI_MEMORY;
goto free_and_return; goto free_and_return;
} }
@ -1138,7 +1158,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
if (malloc_name) if (malloc_name)
free ((char *) name); free ((char *) name);
free (addrmem); free (addrmem);
free (canonbuf); free (canon);
return result; return result;
} }