#include <inttypes.h>
#include <errno.h>
#include <string.h>
+#include "lookup.h"
+
+#define ALIGN (sizeof(struct { char a; char *b; }) - sizeof(char *))
int getservbyname_r(const char *name, const char *prots,
struct servent *se, char *buf, size_t buflen, struct servent **res)
{
- struct addrinfo *ai, hint = { .ai_family = AF_INET };
- int i;
+ struct service servs[MAXSERVS];
+ int cnt, proto, align;
/* Align buffer */
- i = (uintptr_t)buf & sizeof(char *)-1;
- if (!i) i = sizeof(char *);
- if (buflen < 3*sizeof(char *)-i) {
- errno = ERANGE;
- return -1;
- }
- buf += sizeof(char *)-i;
- buflen -= sizeof(char *)-i;
+ align = -(uintptr_t)buf & ALIGN-1;
+ if (buflen < 2*sizeof(char *)+align)
+ return ERANGE;
+ buf += align;
- if (!strcmp(prots, "tcp")) hint.ai_protocol = IPPROTO_TCP;
- else if (!strcmp(prots, "udp")) hint.ai_protocol = IPPROTO_UDP;
- else return -1;
+ if (!prots) proto = 0;
+ else if (!strcmp(prots, "tcp")) proto = IPPROTO_TCP;
+ else if (!strcmp(prots, "udp")) proto = IPPROTO_UDP;
+ else return EINVAL;
- if (getaddrinfo(0, name, &hint, &ai) < 0) return -1;
+ cnt = __lookup_serv(servs, name, proto, 0, 0);
+ if (cnt<0) switch (cnt) {
+ case EAI_MEMORY:
+ case EAI_SYSTEM:
+ return ENOMEM;
+ default:
+ return ENOENT;
+ }
se->s_name = (char *)name;
se->s_aliases = (void *)buf;
se->s_aliases[0] = se->s_name;
se->s_aliases[1] = 0;
- se->s_port = ((struct sockaddr_in *)ai->ai_addr)->sin_port;
- se->s_proto = (char *)prots;
+ se->s_port = htons(servs[0].port);
+ se->s_proto = servs[0].proto == IPPROTO_TCP ? "tcp" : "udp";
- freeaddrinfo(ai);
*res = se;
return 0;
}