41 lines
1,003 B
C
41 lines
1,003 B
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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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 addrinfo *ai, hint = { .ai_family = AF_INET };
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int i;
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/* Align buffer */
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i = (uintptr_t)buf & sizeof(char *)-1;
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if (!i) i = sizeof(char *);
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if (buflen < 3*sizeof(char *)-i) {
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errno = ERANGE;
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return -1;
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}
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buf += sizeof(char *)-i;
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buflen -= sizeof(char *)-i;
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if (!strcmp(prots, "tcp")) hint.ai_protocol = IPPROTO_TCP;
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else if (!strcmp(prots, "udp")) hint.ai_protocol = IPPROTO_UDP;
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else return -1;
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if (getaddrinfo(0, name, &hint, &ai) < 0) return -1;
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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 = ((struct sockaddr_in *)ai->ai_addr)->sin_port;
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se->s_proto = (char *)prots;
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freeaddrinfo(ai);
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*res = se;
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return 0;
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}
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