1#define _GNU_SOURCE 2#include <sys/socket.h> 3#include <netinet/in.h> 4#include <netdb.h> 5#include <inttypes.h> 6#include <errno.h> 7#include <string.h> 8#include "lookup.h" 9 10#define ALIGN (sizeof(struct { char a; char *b; }) - sizeof(char *)) 11 12int getservbyname_r(const char *name, const char *prots, 13 struct servent *se, char *buf, size_t buflen, struct servent **res) 14{ 15 struct service servs[MAXSERVS]; 16 int cnt, proto, align; 17 18 *res = 0; 19 20 /* Align buffer */ 21 align = -(uintptr_t)buf & ALIGN-1; 22 if (buflen < 2*sizeof(char *)+align) 23 return ERANGE; 24 buf += align; 25 26 if (!prots) proto = 0; 27 else if (!strcmp(prots, "tcp")) proto = IPPROTO_TCP; 28 else if (!strcmp(prots, "udp")) proto = IPPROTO_UDP; 29 else return EINVAL; 30 31 cnt = __lookup_serv(servs, name, proto, 0, 0); 32 if (cnt<0) switch (cnt) { 33 case EAI_MEMORY: 34 case EAI_SYSTEM: 35 return ENOMEM; 36 default: 37 return ENOENT; 38 } 39 40 se->s_name = (char *)name; 41 se->s_aliases = (void *)buf; 42 se->s_aliases[0] = se->s_name; 43 se->s_aliases[1] = 0; 44 se->s_port = htons(servs[0].port); 45 se->s_proto = servs[0].proto == IPPROTO_TCP ? "tcp" : "udp"; 46 47 *res = se; 48 return 0; 49} 50