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-rw-r--r--libc/inet/resolv.c226
1 files changed, 48 insertions, 178 deletions
diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c
index 3fd9b81cd..e45154d3f 100644
--- a/libc/inet/resolv.c
+++ b/libc/inet/resolv.c
@@ -82,6 +82,15 @@
#endif /* DEBUG */
+/* Global stuff... */
+extern int nameservers;
+extern char * nameserver[MAX_SERVERS];
+extern int searchdomains;
+extern char * searchdomain[MAX_SEARCH];
+
+
+
+/* Structs */
struct resolv_header {
int id;
int qr,opcode,aa,tc,rd,ra,rcode;
@@ -113,11 +122,7 @@ enum etc_hosts_action {
GET_HOSTS_BYADDR,
};
-
-extern int nameservers;
-extern char * nameserver[MAX_SERVERS];
-extern int searchdomains;
-extern char * searchdomain[MAX_SEARCH];
+/* function prototypes */
extern int get_hosts_byname_r(const char * name, int type,
struct hostent * result_buf,
char * buf, size_t buflen,
@@ -135,28 +140,24 @@ extern int read_etc_hosts_r(FILE *fp, const char * name, int type,
char * buf, size_t buflen,
struct hostent ** result,
int * h_errnop);
-extern int resolve_address(const char * address, int nscount,
- char ** nsip, struct in_addr * in);
-extern int resolve_mailbox(const char * address, int nscount,
- char ** nsip, struct in_addr * in);
extern int dns_lookup(const char * name, int type, int nscount,
char ** nsip, unsigned char ** outpacket, struct resolv_answer * a);
-int encode_dotted(const char * dotted, unsigned char * dest, int maxlen);
-int decode_dotted(const unsigned char * message, int offset,
+extern int encode_dotted(const char * dotted, unsigned char * dest, int maxlen);
+extern int decode_dotted(const unsigned char * message, int offset,
char * dest, int maxlen);
-int length_dotted(const unsigned char * message, int offset);
-int encode_header(struct resolv_header * h, unsigned char * dest, int maxlen);
-int decode_header(unsigned char * data, struct resolv_header * h);
-int encode_question(struct resolv_question * q,
+extern int length_dotted(const unsigned char * message, int offset);
+extern int encode_header(struct resolv_header * h, unsigned char * dest, int maxlen);
+extern int decode_header(unsigned char * data, struct resolv_header * h);
+extern int encode_question(struct resolv_question * q,
unsigned char * dest, int maxlen);
-int decode_question(unsigned char * message, int offset,
+extern int decode_question(unsigned char * message, int offset,
struct resolv_question * q);
-int encode_answer(struct resolv_answer * a,
+extern int encode_answer(struct resolv_answer * a,
unsigned char * dest, int maxlen);
-int decode_answer(unsigned char * message, int offset,
+extern int decode_answer(unsigned char * message, int offset,
struct resolv_answer * a);
-int length_question(unsigned char * message, int offset);
+extern int length_question(unsigned char * message, int offset);
extern int open_nameservers(void);
@@ -343,7 +344,7 @@ int encode_question(struct resolv_question *q,
int decode_question(unsigned char *message, int offset,
struct resolv_question *q)
{
- char temp[256];
+ char temp[BUFSIZ];
int i;
i = decode_dotted(message, offset, temp, sizeof(temp));
@@ -408,7 +409,7 @@ int encode_answer(struct resolv_answer *a, unsigned char *dest, int maxlen)
int decode_answer(unsigned char *message, int offset,
struct resolv_answer *a)
{
- char temp[256];
+ char temp[BUFSIZ];
int i;
i = decode_dotted(message, offset, temp, sizeof(temp));
@@ -533,9 +534,7 @@ int form_query(int id, const char *name, int type, unsigned char *packet,
int dns_lookup(const char *name, int type, int nscount, char **nsip,
unsigned char **outpacket, struct resolv_answer *a)
{
- static int id = 1;
- int i, j, len, fd, pos;
- static int ns = 0;
+ int i, j, len, fd, pos, id, ns;
struct sockaddr_in sa;
#ifdef __UCLIBC_HAS_IPV6__
struct sockaddr_in6 sa6;
@@ -581,7 +580,8 @@ int dns_lookup(const char *name, int type, int nscount, char **nsip,
memset(packet, 0, PACKETSZ);
memset(&h, 0, sizeof(h));
- h.id = ++id;
+ id = (int) random();
+ h.id = id;
h.qdcount = 1;
h.rd = 1;
@@ -753,116 +753,6 @@ fail:
}
#endif
-#ifdef L_resolveaddress
-
-int resolve_address(const char *address, int nscount,
- char **nsip, struct in_addr *in)
-{
- unsigned char *packet;
- struct resolv_answer a;
- char temp[256];
- int i;
- int nest = 0;
-
- if (!address || !in)
- return -1;
-
- strncpy(temp, address, sizeof(temp));
-
- for (;;) {
-
- i = dns_lookup(temp, T_A, nscount, nsip, &packet, &a);
-
- if (i < 0)
- return -1;
-
- free(a.dotted);
-
- if (a.atype == T_CNAME) { /* CNAME */
- DPRINTF("Got a CNAME in resolve_address()\n");
- i = decode_dotted(packet, a.rdoffset, temp, sizeof(temp));
- free(packet);
-
- if (i < 0)
- return -1;
- if (++nest > MAX_RECURSE)
- return -1;
- continue;
- } else if (a.atype == T_A) { /* ADDRESS */
- free(packet);
- break;
- } else {
- free(packet);
- return -1;
- }
- }
-
- if (in)
- memcpy(in, a.rdata, INADDRSZ); /* IPv4 T_A */
-
- return 0;
-}
-#endif
-
-#ifdef L_resolvemailbox
-
-int resolve_mailbox(const char *address, int nscount,
- char **nsip, struct in_addr *in)
-{
- struct resolv_answer a;
- unsigned char *packet;
- char temp[256];
- int nest = 0;
- int i;
-
- if (!address || !in)
- return -1;
-
- /* look up mail exchange */
- i = dns_lookup(address, T_MX, nscount, nsip, &packet, &a);
-
- strncpy(temp, address, sizeof(temp));
-
- if (i >= 0) {
- i = decode_dotted(packet, a.rdoffset+2, temp, sizeof(temp));
- free(packet);
- }
-
- for (;;) {
-
- i = dns_lookup(temp, T_A, nscount, nsip, &packet, &a);
-
- if (i < 0)
- return -1;
-
- free(a.dotted);
-
- if (a.atype == T_CNAME) { /* CNAME */
- DPRINTF("Got a CNAME in resolve_mailbox()\n");
- i = decode_dotted(packet, a.rdoffset, temp, sizeof(temp));
- free(packet);
- if (i < 0)
- return i;
- if (++nest > MAX_RECURSE)
- return -1;
- continue;
- } else if (a.atype == T_A) { /* ADDRESS */
- free(packet);
- break;
- } else {
- free(packet);
- return -1;
- }
- }
-
- if (in)
- memcpy(in, a.rdata, INADDRSZ); /* IPv4 */
-
- return 0;
-}
-#endif
-
-
#ifdef L_opennameservers
int nameservers;
@@ -948,38 +838,6 @@ void close_nameservers(void)
}
#endif
-
-#ifdef L_resolvename
-
-const char *resolve_name(const char *name, int mailbox)
-{
- struct in_addr in;
- int i;
-
- /* shortcut: is it a valid IP address to begin with? */
- if (inet_aton(name, &in))
- return name;
-
- open_nameservers();
-
- DPRINTF("looking up '%s', mailbox=%d, nameservers=%d\n",
- name, mailbox, nameservers);
-
- if (mailbox)
- i = resolve_mailbox(name, nameservers, nameserver, &in);
- else
- i = resolve_address(name, nameservers, nameserver, &in);
-
- if (i < 0)
- return 0;
-
- DPRINTF("success = '%s'\n", inet_ntoa(in));
-
- return inet_ntoa(in);
-}
-#endif
-
-
#ifdef L_gethostbyname
struct hostent *gethostbyname(const char *name)
@@ -1322,33 +1180,42 @@ int read_etc_hosts_r(FILE * fp, const char * name, int type,
#endif
-#ifdef L_endhostent
-extern int __stay_open;
-extern FILE * __gethostent_fp;
+#ifdef L_gethostent
+
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
+# define LOCK pthread_mutex_lock(&mylock)
+# define UNLOCK pthread_mutex_unlock(&mylock);
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+static int __stay_open;
+static FILE * __gethostent_fp;
+
void endhostent (void)
{
+ LOCK;
__stay_open = 0;
if (__gethostent_fp) {
fclose(__gethostent_fp);
}
+ UNLOCK;
}
-#endif
-#ifdef L_sethostent
-extern int __stay_open;
void sethostent (int stay_open)
{
+ LOCK;
__stay_open = stay_open;
+ UNLOCK;
}
-#endif
-#ifdef L_gethostent
-int __stay_open;
-FILE * __gethostent_fp;
struct hostent *gethostent (void)
{
- static struct hostent h;
+ static struct hostent h;
static char buf[
#ifndef __UCLIBC_HAS_IPV6__
sizeof(struct in_addr) + sizeof(struct in_addr *)*2 +
@@ -1358,9 +1225,11 @@ struct hostent *gethostent (void)
80/*namebuffer*/ + 2/* margin */];
struct hostent *host;
+ LOCK;
if (__gethostent_fp == NULL) {
__open_etc_hosts(&__gethostent_fp);
if (__gethostent_fp == NULL) {
+ UNLOCK;
return((struct hostent *)NULL);
}
}
@@ -1370,6 +1239,7 @@ struct hostent *gethostent (void)
if (__stay_open==0) {
fclose(__gethostent_fp);
}
+ UNLOCK;
return(host);
}
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 07:27:01 +0000