* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
-*/
+ */
/*
* Portions Copyright (c) 1985, 1993
#define __FORCE_GLIBC
#include <features.h>
#include <string.h>
+#include <strings.h>
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
+#include <malloc.h>
#include <unistd.h>
#include <resolv.h>
#include <netdb.h>
#include <ctype.h>
+#include <stdbool.h>
#include <arpa/nameser.h>
#include <sys/utsname.h>
#include <sys/un.h>
+#include <bits/uClibc_mutex.h>
+
+__UCLIBC_MUTEX_EXTERN(__resolv_lock);
libc_hidden_proto(memcpy)
libc_hidden_proto(memset)
libc_hidden_proto(__h_errno_location)
#ifdef __UCLIBC_HAS_XLOCALE__
libc_hidden_proto(__ctype_b_loc)
-#else
+#elif __UCLIBC_HAS_CTYPE_TABLES__
libc_hidden_proto(__ctype_b)
#endif
+
+
#define MAX_RECURSE 5
#define REPLY_TIMEOUT 10
#define MAX_RETRIES 3
#define MAX_ALIASES 5
/* 1:ip + 1:full + MAX_ALIASES:aliases + 1:NULL */
-#define ALIAS_DIM (2 + MAX_ALIASES + 1)
+#define ALIAS_DIM (2 + MAX_ALIASES + 1)
#undef DEBUG
/* #define DEBUG */
extern char * __searchdomain[MAX_SEARCH] attribute_hidden;
-#ifdef __UCLIBC_HAS_THREADS__
-# include <pthread.h>
-extern pthread_mutex_t __resolv_lock;
-#endif
-#define BIGLOCK __pthread_mutex_lock(&__resolv_lock)
-#define BIGUNLOCK __pthread_mutex_unlock(&__resolv_lock)
int aclass;
int ttl;
int rdlength;
- unsigned char * rdata;
+ const unsigned char * rdata;
int rdoffset;
char* buf;
size_t buflen;
char ** nsip, unsigned char ** outpacket, struct resolv_answer * a) attribute_hidden;
extern int __encode_dotted(const char * dotted, unsigned char * dest, int maxlen) attribute_hidden;
-extern int __decode_dotted(const unsigned char * message, int offset,
+extern int __decode_dotted(const unsigned char * const message, int offset,
char * dest, int maxlen) attribute_hidden;
-extern int __length_dotted(const unsigned char * message, int offset) attribute_hidden;
+extern int __length_dotted(const unsigned char * const message, int offset) attribute_hidden;
extern int __encode_header(struct resolv_header * h, unsigned char * dest, int maxlen) attribute_hidden;
extern int __decode_header(unsigned char * data, struct resolv_header * h) attribute_hidden;
-extern int __encode_question(struct resolv_question * q,
+extern int __encode_question(const struct resolv_question * const q,
unsigned char * dest, int maxlen) attribute_hidden;
-extern int __decode_question(unsigned char * message, int offset,
+extern int __decode_question(const unsigned char * const message, int offset,
struct resolv_question * q) attribute_hidden;
extern int __encode_answer(struct resolv_answer * a,
unsigned char * dest, int maxlen) attribute_hidden;
-extern int __decode_answer(unsigned char * message, int offset,
+extern int __decode_answer(const unsigned char * message, int offset,
struct resolv_answer * a) attribute_hidden;
-extern int __length_question(unsigned char * message, int offset) attribute_hidden;
-extern int __open_nameservers(void) attribute_hidden;
+extern int __length_question(const unsigned char * const message, int offset) attribute_hidden;
+extern void __open_nameservers(void) attribute_hidden;
extern void __close_nameservers(void) attribute_hidden;
extern int __dn_expand(const u_char *, const u_char *, const u_char *,
char *, int);
int attribute_hidden __encode_dotted(const char *dotted, unsigned char *dest, int maxlen)
{
- int used = 0;
+ unsigned used = 0;
while (dotted && *dotted) {
char *c = strchr(dotted, '.');
/* Decode a dotted string from nameserver transport-level encoding.
This routine understands compressed data. */
-int attribute_hidden __decode_dotted(const unsigned char *data, int offset,
+int attribute_hidden __decode_dotted(const unsigned char * const data, int offset,
char *dest, int maxlen)
{
int l;
- int measure = 1;
- int total = 0;
- int used = 0;
+ bool measure = 1;
+ unsigned total = 0;
+ unsigned used = 0;
if (!data)
return -1;
#endif
#ifdef L_lengthd
-int attribute_hidden __length_dotted(const unsigned char *data, int offset)
+int attribute_hidden __length_dotted(const unsigned char * const data, int offset)
{
int orig_offset = offset;
int l;
#endif
#ifdef L_encodeq
-int attribute_hidden __encode_question(struct resolv_question *q,
+int attribute_hidden __encode_question(const struct resolv_question * const q,
unsigned char *dest, int maxlen)
{
int i;
#endif
#ifdef L_decodeq
-int attribute_hidden __decode_question(unsigned char *message, int offset,
+int attribute_hidden __decode_question(const unsigned char * const message, int offset,
struct resolv_question *q)
{
char temp[256];
#endif
#ifdef L_lengthq
-int attribute_hidden __length_question(unsigned char *message, int offset)
+int attribute_hidden __length_question(const unsigned char * const message, int offset)
{
int i;
#endif
#ifdef L_decodea
-int attribute_hidden __decode_answer(unsigned char *message, int offset,
+int attribute_hidden __decode_answer(const unsigned char *message, int offset,
struct resolv_answer *a)
{
char temp[256];
#endif
#ifdef L_encodep
-int attribute_hidden __encode_packet(struct resolv_header *h,
+int __encode_packet(struct resolv_header *h,
struct resolv_question **q,
struct resolv_answer **an,
struct resolv_answer **ns,
struct resolv_answer **ar,
- unsigned char *dest, int maxlen)
+ unsigned char *dest, int maxlen) attribute_hidden;
+int __encode_packet(struct resolv_header *h,
+ struct resolv_question **q,
+ struct resolv_answer **an,
+ struct resolv_answer **ns,
+ struct resolv_answer **ar,
+ unsigned char *dest, int maxlen)
{
int i, total = 0;
- int j;
+ unsigned j;
i = __encode_header(h, dest, maxlen);
if (i < 0)
#endif
#ifdef L_decodep
-int attribute_hidden __decode_packet(unsigned char *data, struct resolv_header *h)
+int __decode_packet(unsigned char *data, struct resolv_header *h) attribute_hidden;
+int __decode_packet(unsigned char *data, struct resolv_header *h)
{
return __decode_header(data, h);
}
#endif
#ifdef L_formquery
+int __form_query(int id, const char *name, int type, unsigned char *packet, int maxlen);
int __form_query(int id, const char *name, int type, unsigned char *packet,
- int maxlen)
+ int maxlen)
{
struct resolv_header h;
struct resolv_question q;
}
#endif
-#if defined(L_dnslookup) || defined(L_gethostent)
-#ifdef __UCLIBC_HAS_THREADS__
-# include <pthread.h>
-static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
-#endif
-#define LOCK __pthread_mutex_lock(&mylock)
-#define UNLOCK __pthread_mutex_unlock(&mylock)
-#endif
-
#ifdef L_dnslookup
+__UCLIBC_MUTEX_STATIC(mylock, PTHREAD_MUTEX_INITIALIZER);
/* Just for the record, having to lock __dns_lookup() just for these two globals
* is pretty lame. I think these two variables can probably be de-global-ized,
struct resolv_header h;
struct resolv_question q;
struct resolv_answer ma;
- int first_answer = 1;
- int retries = 0;
+ bool first_answer = 1;
+ unsigned retries = 0;
unsigned char * packet = malloc(PACKETSZ);
char *dns, *lookup = malloc(MAXDNAME);
int variant = -1;
struct sockaddr_in sa;
int local_ns = -1, local_id = -1;
#ifdef __UCLIBC_HAS_IPV6__
- int v6;
+ bool v6;
struct sockaddr_in6 sa6;
#endif
DPRINTF("Looking up type %d answer for '%s'\n", type, name);
/* Mess with globals while under lock */
- LOCK;
+ __UCLIBC_MUTEX_LOCK(mylock);
local_ns = ns % nscount;
local_id = id;
- UNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(mylock);
while (retries < MAX_RETRIES) {
if (fd != -1)
++local_id;
local_id &= 0xffff;
h.id = local_id;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ /* this is really __nameserver[] which is a global that
+ needs to hold __resolv_lock before access!! */
dns = nsip[local_ns];
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
h.qdcount = 1;
h.rd = 1;
strncpy(lookup,name,MAXDNAME);
if (variant >= 0) {
- BIGLOCK;
- if (variant < __searchdomains) {
- strncat(lookup,".", MAXDNAME);
- strncat(lookup,__searchdomain[variant], MAXDNAME);
- }
- BIGUNLOCK;
- }
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ if (variant < __searchdomains) {
+ strncat(lookup,".", MAXDNAME);
+ strncat(lookup,__searchdomain[variant], MAXDNAME);
+ }
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ }
DPRINTF("lookup name: %s\n", lookup);
q.dotted = (char *)lookup;
q.qtype = type;
retries+1, NAMESERVER_PORT, dns);
#ifdef __UCLIBC_HAS_IPV6__
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ /* 'dns' is really __nameserver[] which is a global that
+ needs to hold __resolv_lock before access!! */
v6 = inet_pton(AF_INET6, dns, &sa6.sin6_addr) > 0;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
fd = socket(v6 ? AF_INET6 : AF_INET, SOCK_DGRAM, IPPROTO_UDP);
#else
fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
#endif
if (fd < 0) {
- retries++;
+ retries++;
continue;
}
#endif
sa.sin_family = AF_INET;
sa.sin_port = htons(NAMESERVER_PORT);
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ /* 'dns' is really __nameserver[] which is a global that
+ needs to hold __resolv_lock before access!! */
sa.sin_addr.s_addr = inet_addr(dns);
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
rc = connect(fd, (struct sockaddr *) &sa, sizeof(sa));
#ifdef __UCLIBC_HAS_IPV6__
}
#endif
if (rc < 0) {
if (errno == ENETUNREACH) {
- /* routing error, presume not transient */
- goto tryall;
+ /* routing error, presume not transient */
+ goto tryall;
} else
- /* retry */
- retries++;
+ /* retry */
+ retries++;
continue;
}
first_answer = 1;
for (j=0;j<h.ancount;j++,pos += i)
- {
- i = __decode_answer(packet, pos, &ma);
+ {
+ i = __decode_answer(packet, pos, &ma);
- if (i<0) {
- DPRINTF("failed decode %d\n", i);
- goto again;
- }
+ if (i<0) {
+ DPRINTF("failed decode %d\n", i);
+ goto again;
+ }
- if ( first_answer )
- {
- ma.buf = a->buf;
- ma.buflen = a->buflen;
- ma.add_count = a->add_count;
- memcpy(a, &ma, sizeof(ma));
- if (a->atype != T_SIG && (0 == a->buf || (type != T_A && type != T_AAAA)))
- {
- break;
- }
- if (a->atype != type)
- {
- free(a->dotted);
- continue;
- }
- a->add_count = h.ancount - j - 1;
- if ((a->rdlength + sizeof(struct in_addr*)) * a->add_count > a->buflen)
- {
- break;
- }
- a->add_count = 0;
- first_answer = 0;
- }
- else
- {
- free(ma.dotted);
- if (ma.atype != type)
- {
- continue;
- }
- if (a->rdlength != ma.rdlength)
- {
- free(a->dotted);
- DPRINTF("Answer address len(%u) differs from original(%u)\n",
- ma.rdlength, a->rdlength);
- goto again;
+ if ( first_answer )
+ {
+ ma.buf = a->buf;
+ ma.buflen = a->buflen;
+ ma.add_count = a->add_count;
+ memcpy(a, &ma, sizeof(ma));
+ if (a->atype != T_SIG && (0 == a->buf || (type != T_A && type != T_AAAA)))
+ {
+ break;
+ }
+ if (a->atype != type)
+ {
+ free(a->dotted);
+ continue;
+ }
+ a->add_count = h.ancount - j - 1;
+ if ((a->rdlength + sizeof(struct in_addr*)) * a->add_count > a->buflen)
+ {
+ break;
+ }
+ a->add_count = 0;
+ first_answer = 0;
+ }
+ else
+ {
+ free(ma.dotted);
+ if (ma.atype != type)
+ {
+ continue;
+ }
+ if (a->rdlength != ma.rdlength)
+ {
+ free(a->dotted);
+ DPRINTF("Answer address len(%u) differs from original(%u)\n",
+ ma.rdlength, a->rdlength);
+ goto again;
+ }
+ memcpy(a->buf + (a->add_count * ma.rdlength), ma.rdata, ma.rdlength);
+ ++a->add_count;
+ }
}
- memcpy(a->buf + (a->add_count * ma.rdlength), ma.rdata, ma.rdlength);
- ++a->add_count;
- }
- }
DPRINTF("Answer name = |%s|\n", a->dotted);
DPRINTF("Answer type = |%d|\n", a->atype);
free(lookup);
/* Mess with globals while under lock */
- LOCK;
+ __UCLIBC_MUTEX_LOCK(mylock);
ns = local_ns;
id = local_id;
- UNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(mylock);
return (len); /* success! */
- tryall:
+ tryall:
/* if there are other nameservers, give them a go,
otherwise return with error */
{
variant = -1;
- local_ns = (local_ns + 1) % nscount;
- if (local_ns == 0)
- retries++;
+ local_ns = (local_ns + 1) % nscount;
+ if (local_ns == 0)
+ retries++;
- continue;
+ continue;
}
- again:
+ again:
/* if there are searchdomains, try them or fallback as passed */
{
int sdomains;
- BIGLOCK;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
sdomains=__searchdomains;
- BIGUNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
if (variant < sdomains - 1) {
- /* next search */
- variant++;
+ /* next search */
+ variant++;
} else {
- /* next server, first search */
- local_ns = (local_ns + 1) % nscount;
- if (local_ns == 0)
- retries++;
+ /* next server, first search */
+ local_ns = (local_ns + 1) % nscount;
+ if (local_ns == 0)
+ retries++;
- variant = -1;
+ variant = -1;
}
}
}
-fail:
+ fail:
if (fd != -1)
close(fd);
if (lookup)
h_errno = NETDB_INTERNAL;
/* Mess with globals while under lock */
if (local_ns != -1) {
- LOCK;
+ __UCLIBC_MUTEX_LOCK(mylock);
ns = local_ns;
id = local_id;
- UNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(mylock);
}
return -1;
}
#ifdef L_opennameservers
+/* We use __resolv_lock to guard access to the
+ * '__nameservers' and __searchdomains globals */
int __nameservers;
char * __nameserver[MAX_SERVERS];
int __searchdomains;
char * __searchdomain[MAX_SEARCH];
-#ifdef __UCLIBC_HAS_THREADS__
-# include <pthread.h>
-pthread_mutex_t __resolv_lock = PTHREAD_MUTEX_INITIALIZER;
-#endif
+
+__UCLIBC_MUTEX_INIT(__resolv_lock, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP);
/*
* we currently read formats not quite the same as that on normal
* unix systems, we can have a list of nameservers after the keyword.
*/
-int attribute_hidden __open_nameservers()
+void attribute_hidden __open_nameservers()
{
FILE *fp;
int i;
#define RESOLV_ARGS 5
char szBuffer[128], *p, *argv[RESOLV_ARGS];
int argc;
+ /* int rv = 0; */
- BIGLOCK;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
if (__nameservers > 0) {
- BIGUNLOCK;
- return 0;
+ goto DONE;
}
if ((fp = fopen("/etc/resolv.conf", "r")) ||
- (fp = fopen("/etc/config/resolv.conf", "r")))
- {
-
- while (fgets(szBuffer, sizeof(szBuffer), fp) != NULL) {
-
- for (p = szBuffer; *p && isspace(*p); p++)
- /* skip white space */;
- if (*p == '\0' || *p == '\n' || *p == '#') /* skip comments etc */
- continue;
- argc = 0;
- while (*p && argc < RESOLV_ARGS) {
- argv[argc++] = p;
- while (*p && !isspace(*p) && *p != '\n')
- p++;
- while (*p && (isspace(*p) || *p == '\n')) /* remove spaces */
- *p++ = '\0';
- }
+ (fp = fopen("/etc/config/resolv.conf", "r")))
+ {
- if (strcmp(argv[0], "nameserver") == 0) {
- for (i = 1; i < argc && __nameservers < MAX_SERVERS; i++) {
- __nameserver[__nameservers++] = strdup(argv[i]);
- DPRINTF("adding nameserver %s\n", argv[i]);
+ while (fgets(szBuffer, sizeof(szBuffer), fp) != NULL) {
+
+ for (p = szBuffer; *p && isspace(*p); p++)
+ /* skip white space */;
+ if (*p == '\0' || *p == '\n' || *p == '#') /* skip comments etc */
+ continue;
+ argc = 0;
+ while (*p && argc < RESOLV_ARGS) {
+ argv[argc++] = p;
+ while (*p && !isspace(*p) && *p != '\n')
+ p++;
+ while (*p && (isspace(*p) || *p == '\n')) /* remove spaces */
+ *p++ = '\0';
}
- }
- /* domain and search are mutually exclusive, the last one wins */
- if (strcmp(argv[0],"domain")==0 || strcmp(argv[0],"search")==0) {
- while (__searchdomains > 0) {
- free(__searchdomain[--__searchdomains]);
- __searchdomain[__searchdomains] = NULL;
+ if (strcmp(argv[0], "nameserver") == 0) {
+ for (i = 1; i < argc && __nameservers < MAX_SERVERS; i++) {
+ __nameserver[__nameservers++] = strdup(argv[i]);
+ DPRINTF("adding nameserver %s\n", argv[i]);
+ }
}
- for (i=1; i < argc && __searchdomains < MAX_SEARCH; i++) {
- __searchdomain[__searchdomains++] = strdup(argv[i]);
- DPRINTF("adding search %s\n", argv[i]);
+
+ /* domain and search are mutually exclusive, the last one wins */
+ if (strcmp(argv[0],"domain")==0 || strcmp(argv[0],"search")==0) {
+ while (__searchdomains > 0) {
+ free(__searchdomain[--__searchdomains]);
+ __searchdomain[__searchdomains] = NULL;
+ }
+ for (i=1; i < argc && __searchdomains < MAX_SEARCH; i++) {
+ __searchdomain[__searchdomains++] = strdup(argv[i]);
+ DPRINTF("adding search %s\n", argv[i]);
+ }
}
}
+ fclose(fp);
+ DPRINTF("nameservers = %d\n", __nameservers);
+ goto DONE;
}
- fclose(fp);
- DPRINTF("nameservers = %d\n", __nameservers);
- BIGUNLOCK;
- return 0;
- }
DPRINTF("failed to open %s\n", "resolv.conf");
h_errno = NO_RECOVERY;
- BIGUNLOCK;
- return -1;
+
+ /* rv = -1; */
+
+ DONE:
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ /* return rv; */
}
#endif
void attribute_hidden __close_nameservers(void)
{
- BIGLOCK;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
while (__nameservers > 0) {
free(__nameserver[--__nameservers]);
__nameserver[__nameservers] = NULL;
free(__searchdomain[--__searchdomains]);
__searchdomain[__searchdomains] = NULL;
}
- BIGUNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
}
#endif
struct hostent *gethostbyname(const char *name)
{
- static struct hostent h;
- static char buf[sizeof(struct in_addr) +
- sizeof(struct in_addr *)*2 +
- sizeof(char *)*(ALIAS_DIM) + 384/*namebuffer*/ + 32/* margin */];
+ static struct {
+ struct hostent h;
+ char buf[sizeof(struct in_addr) +
+ sizeof(struct in_addr *)*2 +
+ sizeof(char *)*(ALIAS_DIM) + 384/*namebuffer*/ + 32/* margin */];
+ } *sp;
struct hostent *hp;
- gethostbyname_r(name, &h, buf, sizeof(buf), &hp, &h_errno);
+ free(sp);
+ sp = __uc_malloc(sizeof(*sp));
+ gethostbyname_r(name, &sp->h, sp->buf, sizeof(sp->buf), &hp, &h_errno);
return hp;
}
#ifndef __UCLIBC_HAS_IPV6__
return family == AF_INET ? gethostbyname(name) : (struct hostent*)0;
#else /* __UCLIBC_HAS_IPV6__ */
- static struct hostent h;
- static char buf[sizeof(struct in6_addr) +
- sizeof(struct in6_addr *)*2 +
- sizeof(char *)*(ALIAS_DIM) + 384/*namebuffer*/ + 32/* margin */];
+ static struct {
+ struct hostent h;
+ char buf[sizeof(struct in6_addr) +
+ sizeof(struct in6_addr *)*2 +
+ sizeof(char *)*(ALIAS_DIM) + 384/*namebuffer*/ + 32/* margin */];
+ } *sp;
struct hostent *hp;
- gethostbyname2_r(name, family, &h, buf, sizeof(buf), &hp, &h_errno);
+ free(sp);
+ sp = __uc_malloc(sizeof(*sp));
+ gethostbyname2_r(name, family, &sp->h, sp->buf, sizeof(sp->buf), &hp, &h_errno);
return hp;
#endif /* __UCLIBC_HAS_IPV6__ */
#ifdef L_res_init
+/* We use __resolv_lock to guard access to global '_res' */
struct __res_state _res;
int res_init(void)
{
struct __res_state *rp = &(_res);
+ __UCLIBC_MUTEX_LOCK(__resolv_lock); /* must be a recursive lock! */
__close_nameservers();
__open_nameservers();
rp->retrans = RES_TIMEOUT;
/** rp->rhook = NULL; **/
/** rp->_u._ext.nsinit = 0; **/
- BIGLOCK;
if(__searchdomains) {
int i;
for(i=0; i<__searchdomains; i++) {
}
}
rp->nscount = __nameservers;
- BIGUNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
return(0);
}
libc_hidden_def(res_init)
+#ifdef __UCLIBC_HAS_BSD_RES_CLOSE__
void res_close( void )
{
- return;
+ __close_nameservers();
+ memset(&_res, 0, sizeof(_res));
}
+#endif
#endif
memset((char *) &a, '\0', sizeof(a));
- BIGLOCK;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
__nameserversXX=__nameservers;
__nameserverXX=__nameserver;
- BIGUNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
i = __dns_lookup(dname, type, __nameserversXX, __nameserverXX, &packet, &a);
if (i < 0) {
* If enabled, implement search rules until answer or unrecoverable failure
* is detected. Error code, if any, is left in h_errno.
*/
+#define __TRAILING_DOT (1<<0)
+#define __GOT_NODATA (1<<1)
+#define __GOT_SERVFAIL (1<<2)
+#define __TRIED_AS_IS (1<<3)
int res_search(name, class, type, answer, anslen)
- const char *name; /* domain name */
- int class, type; /* class and type of query */
- u_char *answer; /* buffer to put answer */
- int anslen; /* size of answer */
+ const char *name; /* domain name */
+ int class, type; /* class and type of query */
+ u_char *answer; /* buffer to put answer */
+ int anslen; /* size of answer */
{
const char *cp, * const *domain;
HEADER *hp = (HEADER *)(void *)answer;
u_int dots;
- int trailing_dot, ret, saved_herrno;
- int got_nodata = 0, got_servfail = 0, tried_as_is = 0;
-
- if ((!name || !answer) || ((_res.options & RES_INIT) == 0 && res_init() == -1)) {
+ unsigned _state = 0;
+ int ret, saved_herrno;
+ u_long _res_options;
+ unsigned _res_ndots;
+ char **_res_dnsrch;
+
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ _res_options = _res.options;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ if ((!name || !answer) || ((_res_options & RES_INIT) == 0 && res_init() == -1)) {
h_errno = NETDB_INTERNAL;
return (-1);
}
dots = 0;
for (cp = name; *cp; cp++)
dots += (*cp == '.');
- trailing_dot = 0;
+
if (cp > name && *--cp == '.')
- trailing_dot++;
+ _state |= __TRAILING_DOT;
/*
* If there are dots in the name already, let's just give it a try
* 'as is'. The threshold can be set with the "ndots" option.
*/
saved_herrno = -1;
- if (dots >= _res.ndots) {
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ _res_ndots = _res.ndots;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ if (dots >= _res_ndots) {
ret = res_querydomain(name, NULL, class, type, answer, anslen);
if (ret > 0)
return (ret);
saved_herrno = h_errno;
- tried_as_is++;
+ _state |= __TRIED_AS_IS;
}
/*
* - there is at least one dot, there is no trailing dot,
* and RES_DNSRCH is set.
*/
- if ((!dots && (_res.options & RES_DEFNAMES)) ||
- (dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
- int done = 0;
-
- for (domain = (const char * const *)_res.dnsrch;
- *domain && !done;
- domain++) {
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ _res_options = _res.options;
+ _res_dnsrch = _res.dnsrch;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ if ((!dots && (_res_options & RES_DEFNAMES)) ||
+ (dots && !(_state & __TRAILING_DOT) && (_res_options & RES_DNSRCH))) {
+ bool done = 0;
+
+ for (domain = (const char * const *)_res_dnsrch;
+ *domain && !done;
+ domain++) {
ret = res_querydomain(name, *domain, class, type,
- answer, anslen);
+ answer, anslen);
if (ret > 0)
return (ret);
}
switch (h_errno) {
- case NO_DATA:
- got_nodata++;
- /* FALLTHROUGH */
- case HOST_NOT_FOUND:
- /* keep trying */
- break;
- case TRY_AGAIN:
- if (hp->rcode == SERVFAIL) {
- /* try next search element, if any */
- got_servfail++;
+ case NO_DATA:
+ _state |= __GOT_NODATA;
+ /* FALLTHROUGH */
+ case HOST_NOT_FOUND:
+ /* keep trying */
break;
- }
- /* FALLTHROUGH */
- default:
- /* anything else implies that we're done */
- done++;
+ case TRY_AGAIN:
+ if (hp->rcode == SERVFAIL) {
+ /* try next search element, if any */
+ _state |= __GOT_SERVFAIL;
+ break;
+ }
+ /* FALLTHROUGH */
+ default:
+ /* anything else implies that we're done */
+ done = 1;
}
/*
* if we got here for some reason other than DNSRCH,
* we only wanted one iteration of the loop, so stop.
*/
- if (!(_res.options & RES_DNSRCH))
- done++;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ _res_options = _res.options;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ if (!(_res_options & RES_DNSRCH))
+ done = 1;
}
}
* note that we do this regardless of how many dots were in the
* name or whether it ends with a dot.
*/
- if (!tried_as_is) {
+ if (!(_state & __TRIED_AS_IS)) {
ret = res_querydomain(name, NULL, class, type, answer, anslen);
if (ret > 0)
return (ret);
*/
if (saved_herrno != -1)
h_errno = saved_herrno;
- else if (got_nodata)
+ else if (_state & __GOT_NODATA)
h_errno = NO_DATA;
- else if (got_servfail)
+ else if (_state & __GOT_SERVFAIL)
h_errno = TRY_AGAIN;
return (-1);
}
-
+#undef __TRAILING_DOT
+#undef __GOT_NODATA
+#undef __GOT_SERVFAIL
+#undef __TRIED_AS_IS
/*
* Perform a call on res_query on the concatenation of name and domain,
* removing a trailing dot from name if domain is NULL.
*/
int res_querydomain(name, domain, class, type, answer, anslen)
- const char *name, *domain;
- int class, type; /* class and type of query */
- u_char *answer; /* buffer to put answer */
- int anslen; /* size of answer */
+ const char *name, *domain;
+ int class, type; /* class and type of query */
+ u_char *answer; /* buffer to put answer */
+ int anslen; /* size of answer */
{
char nbuf[MAXDNAME];
const char *longname = nbuf;
size_t n, d;
+ u_long _res_options;
- if ((!name || !answer) || ((_res.options & RES_INIT) == 0 && res_init() == -1)) {
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ _res_options = _res.options;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ if ((!name || !answer) || ((_res_options & RES_INIT) == 0 && res_init() == -1)) {
h_errno = NETDB_INTERNAL;
return (-1);
}
#ifdef DEBUG
- if (_res.options & RES_DEBUG)
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ _res_options = _res.options;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ if (_res_options & RES_DEBUG)
printf(";; res_querydomain(%s, %s, %d, %d)\n",
- name, domain?domain:"<Nil>", class, type);
+ name, domain?domain:"<Nil>", class, type);
#endif
if (domain == NULL) {
/*
#ifdef L_gethostbyaddr
struct hostent *gethostbyaddr (const void *addr, socklen_t len, int type)
{
- static struct hostent h;
- static char buf[
+ static struct {
+ struct hostent h;
+ char buf[
#ifndef __UCLIBC_HAS_IPV6__
- sizeof(struct in_addr) + sizeof(struct in_addr *)*2 +
+ sizeof(struct in_addr) + sizeof(struct in_addr *)*2 +
#else
- sizeof(struct in6_addr) + sizeof(struct in6_addr *)*2 +
+ sizeof(struct in6_addr) + sizeof(struct in6_addr *)*2 +
#endif /* __UCLIBC_HAS_IPV6__ */
- sizeof(char *)*(ALIAS_DIM) + 384/*namebuffer*/ + 32/* margin */];
+ sizeof(char *)*(ALIAS_DIM) + 384/*namebuffer*/ + 32/* margin */];
+ } *sp;
struct hostent *hp;
- gethostbyaddr_r(addr, len, type, &h, buf, sizeof(buf), &hp, &h_errno);
+ free(sp);
+ sp = __uc_malloc(sizeof(*sp));
+ gethostbyaddr_r(addr, len, type, &sp->h, sp->buf, sizeof(sp->buf), &hp, &h_errno);
return hp;
}
#ifdef L_gethostent
+__UCLIBC_MUTEX_STATIC(mylock, PTHREAD_MUTEX_INITIALIZER);
static int __stay_open;
static FILE * __gethostent_fp;
void endhostent (void)
{
- LOCK;
+ __UCLIBC_MUTEX_LOCK(mylock);
__stay_open = 0;
if (__gethostent_fp) {
fclose(__gethostent_fp);
}
- UNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(mylock);
}
void sethostent (int stay_open)
{
- LOCK;
+ __UCLIBC_MUTEX_LOCK(mylock);
__stay_open = stay_open;
- UNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(mylock);
}
int gethostent_r(struct hostent *result_buf, char *buf, size_t buflen,
{
int ret;
- LOCK;
+ __UCLIBC_MUTEX_LOCK(mylock);
if (__gethostent_fp == NULL) {
__open_etc_hosts(&__gethostent_fp);
if (__gethostent_fp == NULL) {
- UNLOCK;
- *result=NULL;
- return 0;
+ *result = NULL;
+ ret = TRY_AGAIN;
+ goto DONE;
}
}
ret = __read_etc_hosts_r(__gethostent_fp, NULL, AF_INET, GETHOSTENT,
result_buf, buf, buflen, result, h_errnop);
- if (__stay_open==0) {
+ if (__stay_open == 0) {
fclose(__gethostent_fp);
}
- UNLOCK;
+DONE:
+ __UCLIBC_MUTEX_UNLOCK(mylock);
return(ret);
}
libc_hidden_def(gethostent_r)
struct hostent *gethostent (void)
{
- static struct hostent h;
- static char buf[
+ static struct {
+ struct hostent h;
+ char buf[
#ifndef __UCLIBC_HAS_IPV6__
- sizeof(struct in_addr) + sizeof(struct in_addr *)*2 +
+ sizeof(struct in_addr) + sizeof(struct in_addr *)*2 +
#else
- sizeof(struct in6_addr) + sizeof(struct in6_addr *)*2 +
+ sizeof(struct in6_addr) + sizeof(struct in6_addr *)*2 +
#endif /* __UCLIBC_HAS_IPV6__ */
- sizeof(char *)*(ALIAS_DIM) +
- 80/*namebuffer*/ + 2/* margin */];
+ sizeof(char *)*(ALIAS_DIM) +
+ 80/*namebuffer*/ + 2/* margin */];
+ } *sp;
struct hostent *host;
- LOCK;
- gethostent_r(&h, buf, sizeof(buf), &host, &h_errno);
- UNLOCK;
+ free(sp);
+ sp = __uc_malloc(sizeof(*sp));
+ __UCLIBC_MUTEX_LOCK(mylock);
+ gethostent_r(&sp->h, sp->buf, sizeof(sp->buf), &host, &h_errno);
+ __UCLIBC_MUTEX_UNLOCK(mylock);
return(host);
}
#endif
#endif /* __UCLIBC_HAS_IPV6__ */
switch (type) {
- case AF_INET:
- if (len != sizeof(struct in_addr))
- return 0;
- break;
+ case AF_INET:
+ if (len != sizeof(struct in_addr))
+ return 0;
+ break;
#ifdef __UCLIBC_HAS_IPV6__
- case AF_INET6:
- if (len != sizeof(struct in6_addr))
- return 0;
- break;
+ case AF_INET6:
+ if (len != sizeof(struct in6_addr))
+ return 0;
+ break;
#endif /* __UCLIBC_HAS_IPV6__ */
- default:
- return 0;
+ default:
+ return 0;
}
inet_ntop(type, addr, ipaddr, sizeof(ipaddr));
return(__read_etc_hosts_r(NULL, ipaddr, type, GET_HOSTS_BYADDR,
- result_buf, buf, buflen, result, h_errnop));
+ result_buf, buf, buflen, result, h_errnop));
}
#endif
libc_hidden_proto(getnameinfo)
int getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
- socklen_t hostlen, char *serv, socklen_t servlen,
- unsigned int flags)
+ socklen_t hostlen, char *serv, socklen_t servlen,
+ unsigned int flags)
{
int serrno = errno;
- int ok = 0;
+ unsigned ok;
struct hostent *h = NULL;
char domain[256];
return EAI_BADFLAGS;
if (sa == NULL || addrlen < sizeof (sa_family_t))
- return EAI_FAMILY;
+ goto BAD_FAM;
- switch (sa->sa_family) {
- case AF_LOCAL:
- break;
- case AF_INET:
+ ok = sa->sa_family;
+ if (ok == AF_LOCAL) /* valid */;
+ else if (ok == AF_INET) {
if (addrlen < sizeof (struct sockaddr_in))
- return EAI_FAMILY;
- break;
+ goto BAD_FAM;
#ifdef __UCLIBC_HAS_IPV6__
- case AF_INET6:
+ } else if (ok == AF_INET6) {
if (addrlen < sizeof (struct sockaddr_in6))
- return EAI_FAMILY;
- break;
+ goto BAD_FAM;
#endif /* __UCLIBC_HAS_IPV6__ */
- default:
+ } else
+BAD_FAM:
return EAI_FAMILY;
- }
+ ok = 0;
if (host != NULL && hostlen > 0)
switch (sa->sa_family) {
case AF_INET:
strncpy (host, "localhost", hostlen);
break;
- default:
+/*Already checked above default:
return EAI_FAMILY;
+*/
}
if (serv && (servlen > 0)) {
- switch (sa->sa_family) {
- case AF_INET:
-#ifdef __UCLIBC_HAS_IPV6__
- case AF_INET6:
-#endif /* __UCLIBC_HAS_IPV6__ */
+ if (sa->sa_family == AF_LOCAL) {
+ strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);
+ } else { /* AF_INET || AF_INET6 */
if (!(flags & NI_NUMERICSERV)) {
struct servent *s;
s = getservbyport (((const struct sockaddr_in *) sa)->sin_port,
((flags & NI_DGRAM) ? "udp" : "tcp"));
if (s) {
strncpy (serv, s->s_name, servlen);
- break;
+ goto DONE;
}
}
snprintf (serv, servlen, "%d",
ntohs (((const struct sockaddr_in *) sa)->sin_port));
- break;
-
- case AF_LOCAL:
- strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);
- break;
}
}
+DONE:
if (host && (hostlen > 0))
host[hostlen-1] = 0;
if (serv && (servlen > 0))
#ifdef L_gethostbyname_r
int gethostbyname_r(const char * name,
- struct hostent * result_buf,
- char * buf, size_t buflen,
- struct hostent ** result,
- int * h_errnop)
+ struct hostent * result_buf,
+ char * buf, size_t buflen,
+ struct hostent ** result,
+ int * h_errnop)
{
struct in_addr *in;
struct in_addr **addr_list;
__set_errno(0); /* to check for missing /etc/hosts. */
if ((i=__get_hosts_byname_r(name, AF_INET, result_buf,
- buf, buflen, result, h_errnop))==0)
+ buf, buflen, result, h_errnop))==0)
return i;
switch (*h_errnop) {
case HOST_NOT_FOUND:
for (;;) {
- BIGLOCK;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
__nameserversXX=__nameservers;
__nameserverXX=__nameserver;
- BIGUNLOCK;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
a.buf = buf;
a.buflen = buflen;
a.add_count = 0;
i = __dns_lookup(name, T_A, __nameserversXX, __nameserverXX, &packet, &a);
if (i < 0) {
- *h_errnop = HOST_NOT_FOUND;
- DPRINTF("__dns_lookup\n");
- return TRY_AGAIN;
+ *h_errnop = HOST_NOT_FOUND;
+ DPRINTF("__dns_lookup\n");
+ return TRY_AGAIN;
}
if ((a.rdlength + sizeof(struct in_addr*)) * a.add_count + 256 > buflen)
- {
- free(a.dotted);
- free(packet);
- *h_errnop = NETDB_INTERNAL;
- DPRINTF("buffer too small for all addresses\n");
- return ERANGE;
- }
+ {
+ free(a.dotted);
+ free(packet);
+ *h_errnop = NETDB_INTERNAL;
+ DPRINTF("buffer too small for all addresses\n");
+ return ERANGE;
+ }
else if(a.add_count > 0)
- {
- memmove(buf - sizeof(struct in_addr*)*2, buf, a.add_count * a.rdlength);
- addr_list = (struct in_addr**)(buf + a.add_count * a.rdlength);
- addr_list[0] = in;
- for (i = a.add_count-1; i>=0; --i)
- addr_list[i+1] = (struct in_addr*)(buf - sizeof(struct in_addr*)*2 + a.rdlength * i);
- addr_list[a.add_count + 1] = 0;
- buflen -= (((char*)&(addr_list[a.add_count + 2])) - buf);
- buf = (char*)&addr_list[a.add_count + 2];
- }
+ {
+ memmove(buf - sizeof(struct in_addr*)*2, buf, a.add_count * a.rdlength);
+ addr_list = (struct in_addr**)(buf + a.add_count * a.rdlength);
+ addr_list[0] = in;
+ for (i = a.add_count-1; i>=0; --i)
+ addr_list[i+1] = (struct in_addr*)(buf - sizeof(struct in_addr*)*2 + a.rdlength * i);
+ addr_list[a.add_count + 1] = 0;
+ buflen -= (((char*)&(addr_list[a.add_count + 2])) - buf);
+ buf = (char*)&addr_list[a.add_count + 2];
+ }
strncpy(buf, a.dotted, buflen);
free(a.dotted);
if (a.atype == T_A) { /* ADDRESS */
- memcpy(in, a.rdata, sizeof(*in));
- result_buf->h_name = buf;
- result_buf->h_addrtype = AF_INET;
- result_buf->h_length = sizeof(*in);
- result_buf->h_addr_list = (char **) addr_list;
+ memcpy(in, a.rdata, sizeof(*in));
+ result_buf->h_name = buf;
+ result_buf->h_addrtype = AF_INET;
+ result_buf->h_length = sizeof(*in);
+ result_buf->h_addr_list = (char **) addr_list;
#ifdef __UCLIBC_MJN3_ONLY__
#warning TODO -- generate the full list
#endif
- result_buf->h_aliases = alias; /* TODO: generate the full list */
- free(packet);
- break;
+ result_buf->h_aliases = alias; /* TODO: generate the full list */
+ free(packet);
+ break;
} else {
- free(packet);
- *h_errnop=HOST_NOT_FOUND;
- return TRY_AGAIN;
+ free(packet);
+ *h_errnop=HOST_NOT_FOUND;
+ return TRY_AGAIN;
}
}
#ifdef L_gethostbyname2_r
int gethostbyname2_r(const char *name, int family,
- struct hostent * result_buf,
- char * buf, size_t buflen,
- struct hostent ** result,
- int * h_errnop)
+ struct hostent * result_buf,
+ char * buf, size_t buflen,
+ struct hostent ** result,
+ int * h_errnop)
{
#ifndef __UCLIBC_HAS_IPV6__
return family == (AF_INET)? gethostbyname_r(name, result_buf,
- buf, buflen, result, h_errnop) : HOST_NOT_FOUND;
+ buf, buflen, result, h_errnop) : HOST_NOT_FOUND;
#else /* __UCLIBC_HAS_IPV6__ */
struct in6_addr *in;
struct in6_addr **addr_list;
int old_errno = errno; /* Save the old errno and reset errno */
__set_errno(0); /* to check for missing /etc/hosts. */
- if ((i=__get_hosts_byname_r(name, AF_INET, result_buf,
- buf, buflen, result, h_errnop))==0)
+ if ((i=__get_hosts_byname_r(name, family, result_buf,
+ buf, buflen, result, h_errnop))==0)
return i;
switch (*h_errnop) {
case HOST_NOT_FOUND:
memset((char *) &a, '\0', sizeof(a));
for (;;) {
- BIGLOCK;
- __nameserversXX=__nameservers;
- __nameserverXX=__nameserver;
- BIGUNLOCK;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ __nameserversXX=__nameservers;
+ __nameserverXX=__nameserver;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
i = __dns_lookup(buf, T_AAAA, __nameserversXX, __nameserverXX, &packet, &a);
#ifdef L_gethostbyaddr_r
int gethostbyaddr_r (const void *addr, socklen_t len, int type,
- struct hostent * result_buf,
- char * buf, size_t buflen,
- struct hostent ** result,
- int * h_errnop)
+ struct hostent * result_buf,
+ char * buf, size_t buflen,
+ struct hostent ** result,
+ int * h_errnop)
{
struct in_addr *in;
struct in6_addr *in6;
struct in6_addr **addr_list6;
#endif /* __UCLIBC_HAS_IPV6__ */
+ char **alias;
unsigned char *packet;
struct resolv_answer a;
int i;
/* do /etc/hosts first */
if ((i=__get_hosts_byaddr_r(addr, len, type, result_buf,
- buf, buflen, result, h_errnop))==0)
+ buf, buflen, result, h_errnop))==0)
return i;
switch (*h_errnop) {
case HOST_NOT_FOUND:
buf+=sizeof(*addr_list)*2;
buflen-=sizeof(*addr_list)*2;
+ if (buflen < sizeof(char *)*(ALIAS_DIM))
+ return ERANGE;
+ alias=(char **)buf;
+ buf+=sizeof(*alias)*(ALIAS_DIM);
+ buflen-=sizeof(*alias)*(ALIAS_DIM);
+
#ifdef __UCLIBC_HAS_IPV6__
if (plen < sizeof(*in6))
return ERANGE;
addr_list[0] = in;
sprintf(buf, "%u.%u.%u.%u.in-addr.arpa",
- tmp_addr[3], tmp_addr[2], tmp_addr[1], tmp_addr[0]);
+ tmp_addr[3], tmp_addr[2], tmp_addr[1], tmp_addr[0]);
#ifdef __UCLIBC_HAS_IPV6__
} else {
memcpy(in6->s6_addr, addr, len);
for (i = len - 1; i >= 0; i--) {
qp += sprintf(qp, "%x.%x.", in6->s6_addr[i] & 0xf,
- (in6->s6_addr[i] >> 4) & 0xf);
- }
- strcpy(qp, "ip6.int");
+ (in6->s6_addr[i] >> 4) & 0xf);
+ }
+ strcpy(qp, "ip6.int");
#endif /* __UCLIBC_HAS_IPV6__ */
}
addr_list[1] = 0;
+ alias[0] = buf;
+ alias[1] = 0;
+
for (;;) {
- BIGLOCK;
- __nameserversXX=__nameservers;
- __nameserverXX=__nameserver;
- BIGUNLOCK;
+ __UCLIBC_MUTEX_LOCK(__resolv_lock);
+ __nameserversXX=__nameservers;
+ __nameserverXX=__nameserver;
+ __UCLIBC_MUTEX_UNLOCK(__resolv_lock);
i = __dns_lookup(buf, T_PTR, __nameserversXX, __nameserverXX, &packet, &a);
if (i < 0) {
} else {
result_buf->h_length = sizeof(*in6);
#endif /* __UCLIBC_HAS_IPV6__ */
- }
+ }
result_buf->h_addr_list = (char **) addr_list;
+ result_buf->h_aliases = alias;
break;
} else {
free(packet);
* Return size of compressed name or -1 if there was an error.
*/
int __dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
- char *dst, int dstsiz)
+ char *dst, int dstsiz)
{
int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
*/
static int printable(int ch)
{
- return (ch > 0x20 && ch < 0x7f);
+ return (ch > 0x20 && ch < 0x7f);
}
/*
*/
static int special(int ch)
{
- switch (ch) {
+ switch (ch) {
case 0x22: /* '"' */
case 0x2E: /* '.' */
case 0x3B: /* ';' */
case 0x5C: /* '\\' */
- /* Special modifiers in zone files. */
+ /* Special modifiers in zone files. */
case 0x40: /* '@' */
case 0x24: /* '$' */
- return (1);
+ return (1);
default:
- return (0);
- }
+ return (0);
+ }
}
/*
return (-1);
}
*dn++ = '\0';
- return (dn - dst);
+ return (dn - dst);
}
libc_hidden_def(ns_name_ntop)
while ((n = *srcp++) != 0) {
/* Check for indirection. */
switch (n & NS_CMPRSFLGS) {
- case 0:
- /* Limit checks. */
- if (dstp + n + 1 >= dstlim || srcp + n >= eom) {
- __set_errno (EMSGSIZE);
- return (-1);
- }
- checked += n + 1;
- *dstp++ = n;
- memcpy(dstp, srcp, n);
- dstp += n;
- srcp += n;
- break;
+ case 0:
+ /* Limit checks. */
+ if (dstp + n + 1 >= dstlim || srcp + n >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ checked += n + 1;
+ *dstp++ = n;
+ memcpy(dstp, srcp, n);
+ dstp += n;
+ srcp += n;
+ break;
- case NS_CMPRSFLGS:
- if (srcp >= eom) {
- __set_errno (EMSGSIZE);
- return (-1);
- }
- if (len < 0)
- len = srcp - src + 1;
- srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
- if (srcp < msg || srcp >= eom) { /* Out of range. */
- __set_errno (EMSGSIZE);
- return (-1);
- }
- checked += 2;
- /*
- * Check for loops in the compressed name;
- * if we've looked at the whole message,
- * there must be a loop.
- */
- if (checked >= eom - msg) {
- __set_errno (EMSGSIZE);
- return (-1);
- }
- break;
+ case NS_CMPRSFLGS:
+ if (srcp >= eom) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ if (len < 0)
+ len = srcp - src + 1;
+ srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
+ if (srcp < msg || srcp >= eom) { /* Out of range. */
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ checked += 2;
+ /*
+ * Check for loops in the compressed name;
+ * if we've looked at the whole message,
+ * there must be a loop.
+ */
+ if (checked >= eom - msg) {
+ __set_errno (EMSGSIZE);
+ return (-1);
+ }
+ break;
- default:
- __set_errno (EMSGSIZE);
- return (-1); /* flag error */
+ default:
+ __set_errno (EMSGSIZE);
+ return (-1); /* flag error */
}
}
*dstp = '\0';
projects / uclibc-ng.git / blobdiff