90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
/*
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* \brief Simple http_srv client
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* \author Josef Soentgen
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* \date 2012-8-30
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*/
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/*
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* Copyright (C) 2012-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int
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dial(struct addrinfo *ai)
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{
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struct addrinfo *aip;
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int s, err;
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for (aip = ai; aip != NULL; aip->ai_next) {
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s = socket(aip->ai_family, aip->ai_socktype,
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aip->ai_protocol);
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if (s == -1) {
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perror("socket");
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continue;
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}
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err = connect(s, aip->ai_addr, aip->ai_addrlen);
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if (err != -1)
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break;
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close(s);
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s = -1;
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}
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return s;
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}
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struct addrinfo *
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lookup(const char *proto, const char *host, const char *port)
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{
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struct addrinfo hints, *r;
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int err, socktype, protocol;
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if (proto == NULL) {
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fprintf(stderr, "protocol is not set\n");
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return NULL;
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}
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/**
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* actually we can simply use protcol == 0 but we
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* set it explicitly anyway.
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*/
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if (strcmp(proto, "tcp") == 0) {
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socktype = SOCK_STREAM;
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protocol = IPPROTO_TCP;
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}
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else if (strcmp(proto, "udp") == 0) {
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socktype = SOCK_DGRAM;
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protocol = IPPROTO_UDP;
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}
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else {
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fprintf(stderr, "protocol '%s' invalid\n", proto);
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return NULL;
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}
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = AF_INET;
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hints.ai_socktype = socktype;
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hints.ai_flags = 0;
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hints.ai_protocol = protocol;
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err = getaddrinfo(host, port, &hints, &r);
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if (err != 0) {
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fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(err));
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return NULL;
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}
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return r;
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}
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