58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <logger.h>
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#include <helpers.h>
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int
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helper_open_discovery_socket(uint16_t discovery_port)
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{
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struct addrinfo hints, *res;
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int fd, status;
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memset(&hints, 0, sizeof hints);
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hints.ai_family = AF_INET; // use ipv4
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hints.ai_socktype = SOCK_DGRAM; //set socket flag
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hints.ai_flags = AI_PASSIVE; // get my IP
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char discovery_port_str[6];
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sprintf(discovery_port_str, "%u", discovery_port);
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//get connection info for our computer
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if ((status = getaddrinfo(NULL, discovery_port_str, &hints, &res)) != 0)
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{
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LOG_FATAL("getaddrinfo: %s", gai_strerror(status));
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freeaddrinfo(res);
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exit(EXIT_FAILURE);
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}
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//creating socket
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fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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int yes = 1;
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// lose the pesky "Address already in use" error message
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1)
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{
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LOG_FATAL("setsockopt: %s", strerror(errno));
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freeaddrinfo(res);
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exit(EXIT_FAILURE);
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}
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if (bind(fd, res->ai_addr, res->ai_addrlen) == -1)
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{
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LOG_FATAL("bind: %s", strerror(errno));
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freeaddrinfo(res);
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exit(EXIT_FAILURE);
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}
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freeaddrinfo(res);
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LOG_INFO("opened discovery socket on port %u", discovery_port);
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return fd;
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}
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