56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
#define _GNU_SOURCE
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <inttypes.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include "lookup.h"
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#define ALIGN (sizeof(struct { char a; char *b; }) - sizeof(char *))
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int getservbyname_r(const char *name, const char *prots,
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struct servent *se, char *buf, size_t buflen, struct servent **res)
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{
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struct service servs[MAXSERVS];
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int cnt, proto, align;
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*res = 0;
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/* Don't treat numeric port number strings as service records. */
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char *end = "";
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strtoul(name, &end, 10);
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if (!*end) return ENOENT;
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/* Align buffer */
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align = -(uintptr_t)buf & ALIGN-1;
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if (buflen < 2*sizeof(char *)+align)
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return ERANGE;
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buf += align;
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if (!prots) proto = 0;
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else if (!strcmp(prots, "tcp")) proto = IPPROTO_TCP;
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else if (!strcmp(prots, "udp")) proto = IPPROTO_UDP;
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else return EINVAL;
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cnt = __lookup_serv(servs, name, proto, 0, 0);
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if (cnt<0) switch (cnt) {
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case EAI_MEMORY:
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case EAI_SYSTEM:
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return ENOMEM;
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default:
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return ENOENT;
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}
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se->s_name = (char *)name;
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se->s_aliases = (void *)buf;
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se->s_aliases[0] = se->s_name;
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se->s_aliases[1] = 0;
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se->s_port = htons(servs[0].port);
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se->s_proto = servs[0].proto == IPPROTO_TCP ? "tcp" : "udp";
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*res = se;
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return 0;
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}
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