#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
+#include <net/if.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <stdlib.h>
static int is_valid_hostname(const char *host)
{
const unsigned char *s;
- if (strnlen(host, 256)-1 > 254 || mbstowcs(0, host, 0) > 255) return 0;
+ if (strnlen(host, 255)-1 >= 254 || mbstowcs(0, host, 0) == -1) return 0;
for (s=(void *)host; *s>=0x80 || *s=='.' || *s=='-' || isalnum(*s); s++);
return !*s;
}
return cnt;
}
-int __inet_aton(const char *, struct in_addr *);
-
static int name_from_numeric(struct address buf[static 1], const char *name, int family)
{
- struct in_addr a4;
- struct in6_addr a6;
- if (family != AF_INET6 && __inet_aton(name, &a4)>0) {
- memcpy(&buf[0].addr, &a4, sizeof a4);
- buf[0].family = AF_INET;
- return 1;
- }
- if (family != AF_INET && inet_pton(AF_INET6, name, &a6)>0) {
- memcpy(&buf[0].addr, &a6, sizeof a6);
- buf[0].family = AF_INET6;
- return 1;
- }
- return 0;
+ return __lookup_ipliteral(buf, name, family);
}
static int name_from_hosts(struct address buf[static MAXADDRS], char canon[static 256], const char *name, int family)
case RR_A:
if (len != 4) return -1;
ctx->addrs[ctx->cnt].family = AF_INET;
+ ctx->addrs[ctx->cnt].scopeid = 0;
memcpy(ctx->addrs[ctx->cnt++].addr, data, 4);
break;
case RR_AAAA:
if (len != 16) return -1;
ctx->addrs[ctx->cnt].family = AF_INET6;
+ ctx->addrs[ctx->cnt].scopeid = 0;
memcpy(ctx->addrs[ctx->cnt++].addr, data, 16);
break;
case RR_CNAME:
for (i=0; i<nq; i++)
__dns_parse(abuf[i], alens[i], dns_parse_callback, &ctx);
- return ctx.cnt;
+ if (ctx.cnt) return ctx.cnt;
+ if (alens[0] < 4 || (abuf[0][3] & 15) == 2) return EAI_AGAIN;
+ if ((abuf[0][3] & 15) == 3) return EAI_NONAME;
+ return EAI_FAIL;
}
int __lookup_name(struct address buf[static MAXADDRS], char canon[static 256], const char *name, int family, int flags)
*canon = 0;
if (name) {
- size_t l;
- if ((l = strnlen(name, 256))-1 > 254)
+ /* reject empty name and check len so it fits into temp bufs */
+ size_t l = strnlen(name, 255);
+ if (l-1 >= 254)
return EAI_NONAME;
memcpy(canon, name, l+1);
}
/* Try each backend until there's at least one result. */
cnt = name_from_null(buf, name, family, flags);
- if (cnt<=0) cnt = name_from_numeric(buf, name, family);
- if (cnt<=0 && !(flags & AI_NUMERICHOST)) {
+ if (!cnt) cnt = name_from_numeric(buf, name, family);
+ if (!cnt && !(flags & AI_NUMERICHOST)) {
cnt = name_from_hosts(buf, canon, name, family);
- if (cnt<=0) cnt = name_from_dns(buf, canon, name, family);
+ if (!cnt) cnt = name_from_dns(buf, canon, name, family);
}
if (cnt<=0) return cnt ? cnt : EAI_NONAME;
if (buf[i].family != AF_INET) continue;
memcpy(buf[i].addr+12, buf[i].addr, 4);
memcpy(buf[i].addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
- buf[i].scopeid = 0;
buf[i].family = AF_INET6;
}
}