sysdis-project/central-manager/lib/network/udp/server.c

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#include "server.h"
int DROP_UDP_SERVER(const char* pAddr, const int pPort, int* pListenSock, struct sockaddr_in* pInfo, const char pMcast){
if( DEBUGMOD&HDR ) printf("====== DROP_UDP_MCAST(%s, %d, %p, %p, %d) ======\n\n", pAddr, pPort, (void*) pListenSock, (void*) pInfo, (int) pMcast);
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/* [0] Initialisation des variables
=========================================================*/
int STATUS; // status
uint yes = 1;
struct ip_mreq mcastReq;
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*pListenSock = -1;
/* [1] Création de la socket
=======================================================*/
/* 1. Création socket */
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*pListenSock = socket(AF_INET, SOCK_DGRAM, 0);
if( DEBUGMOD&SCK && DEBUGMOD&HDR ) printf(" * [drop_udp_server] socket: %d\n", *pListenSock);
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/* 2. Gestion erreur */
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if( *pListenSock < 0 ) return -1;
/* 3. MULTICAST -> Autorisation plusieurs sockets sur port */
if( pMcast ){
if( DEBUGMOD&SCK && DEBUGMOD&HDR ) printf(" * [drop_udp_server] set port to be reused\n");
if( setsockopt(*pListenSock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(uint) ) < 0 ){
close(*pListenSock);
return -1;
}
}
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/* [2] On définit les infos de la socket
=========================================================*/
/* (1) Reset des valeurs */
bzero(pInfo, sizeof(struct sockaddr_in));
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/* (2) On définit les infos */
pInfo->sin_family = AF_INET;
pInfo->sin_port = htons(pPort);
pInfo->sin_addr.s_addr = htonl(INADDR_ANY);
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/* [3] On publie la SOCKET
=======================================================*/
/* 1. Publication socket */
STATUS = bind(*pListenSock, (struct sockaddr*) pInfo, sizeof(struct sockaddr_in));
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if( DEBUGMOD&SCK && DEBUGMOD&HDR ) printf(" * [drop_udp_server] bind: %d\n", STATUS);
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/* 2. Gestion erreur */
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if( STATUS < 0 ) return -1;
/* 3. Demande groupe multicast (si demandé) */
if( pMcast ){
if( DEBUGMOD&SCK && DEBUGMOD&HDR ) printf(" * [drop_udp_server] join mcast group: %s\n", pAddr);
mcastReq.imr_multiaddr.s_addr = inet_addr(pAddr);
mcastReq.imr_interface.s_addr = htonl(INADDR_ANY);
if( setsockopt(*pListenSock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mcastReq, sizeof(mcastReq)) < 0 ){
close(*pListenSock);
return -1;
}
}
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/* [n] Code succès
=========================================================*/
return 0;
}