From d09f1655887b453e86c9c29b40463218a778fbc2 Mon Sep 17 00:00:00 2001 From: Bernhard Reutner-Fischer Date: Fri, 13 Feb 2009 15:04:08 +0000 Subject: - fix comment style to make it compile again - add note about "/etc/config/" and the resolver code per se. --- libc/inet/resolv.c | 64 +++++++++++++++++++++++++++++++----------------------- 1 file changed, 37 insertions(+), 27 deletions(-) (limited to 'libc') 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 #include @@ -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; -- cgit v1.2.3