49 lines
985 B
C
49 lines
985 B
C
/* minimal CoAP functions
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*
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* Copyright (C) 2018-2021 Olaf Bergmann <bergmann@tzi.org>
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include "common.h"
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int
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resolve_address(const char *host, const char *service, coap_address_t *dst) {
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struct addrinfo *res, *ainfo;
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struct addrinfo hints;
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int error, len=-1;
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memset(&hints, 0, sizeof(hints));
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memset(dst, 0, sizeof(*dst));
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hints.ai_socktype = SOCK_DGRAM;
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hints.ai_family = AF_UNSPEC;
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error = getaddrinfo(host, service, &hints, &res);
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if (error != 0) {
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fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(error));
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return error;
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}
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for (ainfo = res; ainfo != NULL; ainfo = ainfo->ai_next) {
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switch (ainfo->ai_family) {
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case AF_INET6:
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case AF_INET:
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len = dst->size = ainfo->ai_addrlen;
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memcpy(&dst->addr.sin6, ainfo->ai_addr, dst->size);
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goto finish;
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default:
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;
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}
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}
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finish:
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freeaddrinfo(res);
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return len;
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}
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