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-rw-r--r--libc/inet/resolv.c64
1 files changed, 37 insertions, 27 deletions
diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c
index 6be3a866d..938fd8ca8 100644
--- a/libc/inet/resolv.c
+++ b/libc/inet/resolv.c
@@ -133,6 +133,14 @@
*
*/
+/* Nota bene:
+ The whole resolver code has several (severe) problems:
+ - it doesn't even build without IPv4, i.e. !UCLIBC_HAS_IPV4 but only IPv6
+ - it is way too big
+
+ Both points above are considered bugs, patches/reimplementations welcome.
+*/
+
#define __FORCE_GLIBC
#include <features.h>
#include <string.h>
@@ -303,7 +311,7 @@ __UCLIBC_MUTEX_EXTERN(__resolv_lock);
/* Protected by __resolv_lock */
extern void (*__res_sync)(void) attribute_hidden;
-//extern uint32_t __resolv_opts attribute_hidden;
+/*extern uint32_t __resolv_opts attribute_hidden; */
extern unsigned __nameservers attribute_hidden;
extern unsigned __searchdomains attribute_hidden;
extern sockaddr46_t *__nameserver attribute_hidden;
@@ -651,7 +659,7 @@ int attribute_hidden __decode_question(const unsigned char * const message, int
offset += i;
-//TODO: what if strdup fails?
+/*TODO: what if strdup fails? */
q->dotted = strdup(temp);
q->qtype = (message[offset + 0] << 8) | message[offset + 1];
q->qclass = (message[offset + 2] << 8) | message[offset + 3];
@@ -731,7 +739,7 @@ int attribute_hidden __decode_answer(const unsigned char *message, int offset,
return len;
}
-// TODO: what if strdup fails?
+/* TODO: what if strdup fails? */
a->dotted = strdup(temp);
a->atype = (message[0] << 8) | message[1];
message += 2;
@@ -875,7 +883,7 @@ __UCLIBC_MUTEX_INIT(__resolv_lock, PTHREAD_MUTEX_INITIALIZER);
/* Protected by __resolv_lock */
void (*__res_sync)(void);
-//uint32_t __resolv_opts;
+/*uint32_t __resolv_opts; */
unsigned __nameservers;
unsigned __searchdomains;
sockaddr46_t *__nameserver;
@@ -944,7 +952,10 @@ void attribute_hidden __open_nameservers(void)
fp = fopen("/etc/resolv.conf", "r");
if (!fp) {
-// TODO: why? google says nothing about this...
+ /* If we do not have a pre-populated /etc/resolv.conf then
+ try to use the one from /etc/config which exists on numerous
+ systems ranging from some uClinux to IRIX installations and
+ may be the only /etc dir that was mounted rw. */
fp = fopen("/etc/config/resolv.conf", "r");
}
@@ -1169,12 +1180,12 @@ int attribute_hidden __dns_lookup(const char *name, int type,
/* first time? pick starting server etc */
if (local_ns_num < 0) {
local_id = last_id;
-//TODO: implement /etc/resolv.conf's "options rotate"
-// (a.k.a. RES_ROTATE bit in _res.options)
-// local_ns_num = 0;
-// if (_res.options & RES_ROTATE)
+/*TODO: implement /etc/resolv.conf's "options rotate"
+ (a.k.a. RES_ROTATE bit in _res.options)
+ local_ns_num = 0;
+ if (_res.options & RES_ROTATE) */
local_ns_num = last_ns_num;
-//TODO: use _res.retry
+/*TODO: use _res.retry */
retries_left = __nameservers * RES_DFLRETRY;
}
retries_left--;
@@ -1221,20 +1232,20 @@ int attribute_hidden __dns_lookup(const char *name, int type,
goto try_next_server;
rc = connect(fd, &sa.sa, sizeof(sa));
if (rc < 0) {
- //if (errno == ENETUNREACH) {
+ /*if (errno == ENETUNREACH) { */
/* routing error, presume not transient */
goto try_next_server;
- //}
-//For example, what transient error this can be? Can't think of any
- ///* retry */
- //continue;
+ /*} */
+/*For example, what transient error this can be? Can't think of any */
+ /* retry */
+ /*continue; */
}
DPRINTF("Xmit packet len:%d id:%d qr:%d\n", len, h.id, h.qr);
/* no error check - if it fails, we time out on recv */
send(fd, packet, len, 0);
#ifdef USE_SELECT
-//TODO: use _res.retrans
+/*TODO: use _res.retrans*/
reply_timeout = RES_TIMEOUT;
wait_again:
FD_ZERO(&fds);
@@ -1259,7 +1270,7 @@ int attribute_hidden __dns_lookup(const char *name, int type,
* to next nameserver */
goto try_next_server;
}
-//TODO: better timeout accounting?
+/*TODO: better timeout accounting?*/
reply_timeout -= 1000;
#endif
len = recv(fd, packet, PACKETSZ, MSG_DONTWAIT);
@@ -1805,8 +1816,6 @@ libc_hidden_def(getnameinfo)
#ifdef L_gethostbyname_r
-//Does this function assume IPv4? If yes,
-//what happens in IPv6-only build?
/* Bug 671 says:
* "uClibc resolver's gethostbyname does not return the requested name
@@ -2109,7 +2118,7 @@ int gethostbyname2_r(const char *name,
result_buf->h_addrtype = AF_INET6;
result_buf->h_length = sizeof(*in);
result_buf->h_addr_list = (char **) addr_list;
- //result_buf->h_aliases = ???
+ /* result_buf->h_aliases = ??? */
*result = result_buf;
*h_errnop = NETDB_SUCCESS;
return NETDB_SUCCESS;
@@ -2124,10 +2133,10 @@ int gethostbyname2_r(const char *name,
}
/* talk to DNS servers */
-// TODO: why it's so different from gethostbyname_r (IPv4 case)?
+/* TODO: why it's so different from gethostbyname_r (IPv4 case)? */
memset(&a, '\0', sizeof(a));
for (;;) {
-// Hmm why we memset(a) to zeros only once?
+/* Hmm why we memset(a) to zeros only once? */
i = __dns_lookup(buf, T_AAAA, &packet, &a);
if (i < 0) {
*h_errnop = HOST_NOT_FOUND;
@@ -2157,7 +2166,7 @@ int gethostbyname2_r(const char *name,
result_buf->h_addrtype = AF_INET6;
result_buf->h_length = sizeof(*in);
result_buf->h_addr_list = (char **) addr_list;
- //result_buf->h_aliases = ???
+ /* result_buf->h_aliases = ??? */
free(packet);
*result = result_buf;
*h_errnop = NETDB_SUCCESS;
@@ -2281,7 +2290,7 @@ int gethostbyaddr_r(const void *addr, socklen_t addrlen, int type,
memset(&a, '\0', sizeof(a));
for (;;) {
-// Hmm why we memset(a) to zeros only once?
+/* Hmm why we memset(a) to zeros only once? */
i = __dns_lookup(buf, T_PTR, &packet, &a);
if (i < 0) {
*h_errnop = HOST_NOT_FOUND;
@@ -2730,9 +2739,10 @@ static void res_sync_func(void)
}
/* Extend and comment what program is known
* to use which _res.XXX member(s).
+
+ __resolv_opts = rp->options;
+ ...
*/
- // __resolv_opts = rp->options;
- // ...
}
/* Our res_init never fails (always returns 0) */
@@ -2756,7 +2766,7 @@ int res_init(void)
#ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
rp->retrans = RES_TIMEOUT;
rp->retry = 4;
-//TODO: pulls in largish static buffers... use simpler one?
+/*TODO: pulls in largish static buffers... use simpler one? */
rp->id = random();
#endif
rp->ndots = 1;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 04:37:06 +0000