summaryrefslogtreecommitdiff
path: root/sysdeps/posix/getaddrinfo.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/posix/getaddrinfo.c')
-rw-r--r--sysdeps/posix/getaddrinfo.c184
1 files changed, 143 insertions, 41 deletions
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 46c66a8f7e..843e60bba3 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -68,7 +68,7 @@ extern int __idna_to_unicode_lzlz (const char *input, char **output,
#define GAIH_EAI ~(GAIH_OKIFUNSPEC)
#ifndef UNIX_PATH_MAX
-#define UNIX_PATH_MAX 108
+# define UNIX_PATH_MAX 108
#endif
struct gaih_service
@@ -177,9 +177,9 @@ gaih_local (const char *name, const struct gaih_service *service,
if (! tp->name[0])
{
if (req->ai_socktype)
- return (GAIH_OKIFUNSPEC | -EAI_SOCKTYPE);
+ return GAIH_OKIFUNSPEC | -EAI_SOCKTYPE;
else
- return (GAIH_OKIFUNSPEC | -EAI_SERVICE);
+ return GAIH_OKIFUNSPEC | -EAI_SERVICE;
}
}
@@ -249,9 +249,10 @@ gaih_local (const char *name, const struct gaih_service *service,
}
#endif /* 0 */
+
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 servent *s;
size_t tmpbuflen = 1024;
@@ -362,6 +363,7 @@ typedef enum nss_status (*nss_getcanonname_r)
int *errnop, int *h_errnop);
extern service_user *__nss_hosts_database attribute_hidden;
+
static int
gaih_inet (const char *name, const struct gaih_service *service,
const struct addrinfo *req, struct addrinfo **pai,
@@ -389,9 +391,9 @@ gaih_inet (const char *name, const struct gaih_service *service,
if (! tp->name[0])
{
if (req->ai_socktype)
- return (GAIH_OKIFUNSPEC | -EAI_SOCKTYPE);
+ return GAIH_OKIFUNSPEC | -EAI_SOCKTYPE;
else
- return (GAIH_OKIFUNSPEC | -EAI_SERVICE);
+ return GAIH_OKIFUNSPEC | -EAI_SERVICE;
}
}
@@ -399,7 +401,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
if (service != NULL)
{
if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
- return (GAIH_OKIFUNSPEC | -EAI_SERVICE);
+ return GAIH_OKIFUNSPEC | -EAI_SERVICE;
if (service->num < 0)
{
@@ -443,7 +445,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
pst = &(newp->next);
}
if (st == (struct gaih_servtuple *) &nullserv)
- return (GAIH_OKIFUNSPEC | -EAI_SERVICE);
+ return GAIH_OKIFUNSPEC | -EAI_SERVICE;
}
}
else
@@ -538,16 +540,10 @@ gaih_inet (const char *name, const struct gaih_service *service,
else
return -EAI_ADDRFAMILY;
- dupname:
if (req->ai_flags & AI_CANONNAME)
- {
- canon = strdup (name);
- if (canon == NULL)
- return -EAI_MEMORY;
- }
+ canon = name;
}
-
- if (at->family == AF_UNSPEC)
+ else if (at->family == AF_UNSPEC)
{
char *namebuf = (char *) name;
char *scope_delim = strchr (name, SCOPE_DELIMITER);
@@ -595,7 +591,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
}
}
- goto dupname;
+ if (req->ai_flags & AI_CANONNAME)
+ canon = name;
}
}
@@ -689,7 +686,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
}
/* We made requests but they turned out no data.
The name is known, though. */
- return (GAIH_OKIFUNSPEC | -EAI_NODATA);
+ return GAIH_OKIFUNSPEC | -EAI_NODATA;
}
goto process_list;
@@ -756,7 +753,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
free (air);
if (at->family == AF_UNSPEC)
- return (GAIH_OKIFUNSPEC | -EAI_NONAME);
+ return GAIH_OKIFUNSPEC | -EAI_NONAME;
goto process_list;
}
@@ -898,13 +895,13 @@ gaih_inet (const char *name, const struct gaih_service *service,
/* We made requests but they turned out no data. The name
is known, though. */
- return (GAIH_OKIFUNSPEC | -EAI_NODATA);
+ return GAIH_OKIFUNSPEC | -EAI_NODATA;
}
}
process_list:
if (at->family == AF_UNSPEC)
- return (GAIH_OKIFUNSPEC | -EAI_NONAME);
+ return GAIH_OKIFUNSPEC | -EAI_NONAME;
}
else
{
@@ -1098,6 +1095,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
return 0;
}
+#if 0
static const struct gaih gaih[] =
{
{ PF_INET6, gaih_inet },
@@ -1107,6 +1105,7 @@ static const struct gaih gaih[] =
#endif
{ PF_UNSPEC, NULL }
};
+#endif
struct sort_result
{
@@ -1114,6 +1113,7 @@ struct sort_result
struct sockaddr_storage source_addr;
uint8_t source_addr_len;
bool got_source_addr;
+ uint8_t source_addr_flags;
};
@@ -1204,7 +1204,7 @@ static const struct prefixlist default_precedence[] =
96, 20 },
{ { .in6_u = { .u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0xffff, 0x0000, 0x0000 } } },
- 96, 10 },
+ 96, 100 },
{ { .in6_u = { .u6_addr16 = { 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000 } } },
0, 40 }
@@ -1336,8 +1336,16 @@ rfc3484_sort (const void *p1, const void *p2)
}
- /* Rule 3: Avoid deprecated addresses.
- That's something only the kernel could decide. */
+ /* Rule 3: Avoid deprecated addresses. */
+ if (a1->got_source_addr)
+ {
+ if (!(a1->source_addr_flags & in6ai_deprecated)
+ && (a2->source_addr_flags & in6ai_deprecated))
+ return -1;
+ if ((a1->source_addr_flags & in6ai_deprecated)
+ && !(a2->source_addr_flags & in6ai_deprecated))
+ return 1;
+ }
/* Rule 4: Prefer home addresses.
Another thing only the kernel can decide. */
@@ -1372,8 +1380,18 @@ rfc3484_sort (const void *p1, const void *p2)
return 1;
- /* Rule 7: Prefer native transport.
- XXX How to recognize tunnels? */
+ /* Rule 7: Prefer native transport. */
+ if (a1->got_source_addr)
+ {
+ if (!(a1->source_addr_flags & in6ai_temporary)
+ && (a1->source_addr_flags & in6ai_temporary))
+ return -1;
+ if ((a1->source_addr_flags & in6ai_temporary)
+ && !(a1->source_addr_flags & in6ai_temporary))
+ return -1;
+
+ /* XXX Do we need to check anything beside temporary addresses? */
+ }
/* Rule 8: Prefer smaller scope. */
@@ -1454,15 +1472,23 @@ rfc3484_sort (const void *p1, const void *p2)
}
+static int
+in6aicmp (const void *p1, const void *p2)
+{
+ struct in6addrinfo *a1 = (struct in6addrinfo *) p1;
+ struct in6addrinfo *a2 = (struct in6addrinfo *) p2;
+
+ return memcmp (a1->addr, a2->addr, sizeof (a1->addr));
+}
+
+
int
getaddrinfo (const char *name, const char *service,
const struct addrinfo *hints, struct addrinfo **pai)
{
- int i = 0, j = 0, last_i = 0;
+ int i = 0, last_i = 0;
int nresults = 0;
- struct addrinfo *p = NULL, **end;
- const struct gaih *g = gaih;
- const struct gaih *pg = NULL;
+ struct addrinfo *p = NULL;
struct gaih_service gaih_service, *pservice;
struct addrinfo local_hints;
@@ -1490,15 +1516,23 @@ getaddrinfo (const char *name, const char *service,
if ((hints->ai_flags & AI_CANONNAME) && name == NULL)
return EAI_BADFLAGS;
+ struct in6addrinfo *in6ai;
+ size_t in6ailen;
+ bool seen_ipv4 = false;
+ bool seen_ipv6 = false;
+ /* We might need information about what kind of interfaces are available.
+ But even if AI_ADDRCONFIG is not used, if the user requested IPv6
+ addresses we have to know whether an address is deprecated or
+ temporary. */
+ if ((hints->ai_flags & AI_ADDRCONFIG) || hints->ai_family == PF_UNSPEC
+ || hints->ai_family == PF_INET6)
+ /* Determine whether we have IPv4 or IPv6 interfaces or both. We
+ cannot cache the results since new interfaces could be added at
+ any time. */
+ __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);
+
if (hints->ai_flags & AI_ADDRCONFIG)
{
- /* Determine whether we have IPv4 or IPv6 interfaces or both.
- We cannot cache the results since new interfaces could be
- added at any time. */
- bool seen_ipv4;
- bool seen_ipv6;
- __check_pf (&seen_ipv4, &seen_ipv6);
-
/* Now make a decision on what we return, if anything. */
if (hints->ai_family == PF_UNSPEC && (seen_ipv4 || seen_ipv6))
{
@@ -1513,8 +1547,11 @@ getaddrinfo (const char *name, const char *service,
}
else if ((hints->ai_family == PF_INET && ! seen_ipv4)
|| (hints->ai_family == PF_INET6 && ! seen_ipv6))
- /* We cannot possibly return a valid answer. */
- return EAI_NONAME;
+ {
+ /* We cannot possibly return a valid answer. */
+ free (in6ai);
+ return EAI_NONAME;
+ }
}
if (service && service[0])
@@ -1525,7 +1562,10 @@ getaddrinfo (const char *name, const char *service,
if (*c != '\0')
{
if (hints->ai_flags & AI_NUMERICSERV)
- return EAI_NONAME;
+ {
+ free (in6ai);
+ return EAI_NONAME;
+ }
gaih_service.num = -1;
}
@@ -1535,12 +1575,21 @@ getaddrinfo (const char *name, const char *service,
else
pservice = NULL;
+ struct addrinfo **end;
if (pai)
end = &p;
else
end = NULL;
unsigned int naddrs = 0;
+#if 0
+ /* If we would support more protocols than just IPv4 and IPv6 we
+ would iterate over a table with appropriate callback functions.
+ Since we currently only handle IPv4 and IPv6 this is not
+ necessary. */
+ const struct gaih *g = gaih;
+ const struct gaih *pg = NULL;
+ int j = 0;
while (g->gaih)
{
if (hints->ai_family == g->family || hints->ai_family == AF_UNSPEC)
@@ -1564,6 +1613,7 @@ getaddrinfo (const char *name, const char *service,
}
freeaddrinfo (p);
+ free (in6ai);
return -(i & GAIH_EAI);
}
@@ -1579,7 +1629,35 @@ getaddrinfo (const char *name, const char *service,
}
if (j == 0)
- return EAI_FAMILY;
+ {
+ free (in6ai);
+ return EAI_FAMILY;
+ }
+#else
+ 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);
+ if (last_i != 0)
+ {
+ freeaddrinfo (p);
+ free (in6ai);
+
+ return -(i & GAIH_EAI);
+ }
+ if (end)
+ while (*end)
+ {
+ end = &((*end)->ai_next);
+ ++nresults;
+ }
+ }
+ else
+ {
+ free (in6ai);
+ return EAI_FAMILY;
+ }
+#endif
if (naddrs > 1)
{
@@ -1589,6 +1667,11 @@ getaddrinfo (const char *name, const char *service,
struct addrinfo *last = NULL;
char *canonname = NULL;
+ /* If we have information about deprecated and temporary address
+ sort the array now. */
+ if (in6ai != NULL)
+ qsort (in6ai, in6ailen, sizeof (*in6ai), in6aicmp);
+
for (i = 0, q = p; q != NULL; ++i, last = q, q = q->ai_next)
{
results[i].dest_addr = q;
@@ -1603,9 +1686,12 @@ getaddrinfo (const char *name, const char *service,
results[i - 1].source_addr_len);
results[i].source_addr_len = results[i - 1].source_addr_len;
results[i].got_source_addr = results[i - 1].got_source_addr;
+ results[i].source_addr_flags = results[i - 1].source_addr_flags;
}
else
{
+ results[i].source_addr_flags = 0;
+
/* We overwrite the type with SOCK_DGRAM since we do not
want connect() to connect to the other side. If we
cannot determine the source address remember this
@@ -1620,6 +1706,20 @@ getaddrinfo (const char *name, const char *service,
{
results[i].source_addr_len = sl;
results[i].got_source_addr = true;
+
+ if (q->ai_family == PF_INET6 && in6ai != NULL)
+ {
+ /* See whether the address is the list of deprecated
+ or temporary addresses. */
+ struct in6addrinfo tmp;
+ memcpy (tmp.addr, q->ai_addr, IN6ADDRSZ);
+
+ struct in6addrinfo *found
+ = bsearch (&tmp, in6ai, in6ailen, sizeof (*in6ai),
+ in6aicmp);
+ if (found != NULL)
+ results[i].source_addr_flags = found->flags;
+ }
}
else
/* Just make sure that if we have to process the same
@@ -1653,6 +1753,8 @@ getaddrinfo (const char *name, const char *service,
p->ai_canonname = canonname;
}
+ free (in6ai);
+
if (p)
{
*pai = p;
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-30 16:05:03 +0000