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[lib] getaddrinfo() in create_udp_listening_socket()

This commit is contained in:
Matteo Cypriani 2013-09-20 17:30:04 -04:00
parent 25cc1ee67a
commit 49066f451b
1 changed files with 34 additions and 18 deletions
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52
libowlps/libowlps.c
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@ -481,32 +481,48 @@ int owl_create_udp_trx_socket(const char *const server_address,
*/ */
int owl_create_udp_listening_socket(const uint_fast16_t port) int owl_create_udp_listening_socket(const uint_fast16_t port)
{ {
char port_str[6] ;
struct addrinfo
gai_hints,
*gai_results = NULL,
*gai_res = NULL ;
int gai_ret ; // Return value of getaddrinfo()
int sockfd ; // Socket descriptor int sockfd ; // Socket descriptor
struct sockaddr_in server_description ; // Server structure
int ret = 0 ; // Return value
/* Create the UDP socket */ /* Get the server information */
sockfd = socket(AF_INET, SOCK_DGRAM, 0) ; sprintf(port_str, "%"PRIuFAST16, port) ;
if (sockfd < 0) memset(&gai_hints, 0, sizeof(struct addrinfo)) ;
gai_hints.ai_family = AF_INET ; // IPv4 only
gai_hints.ai_socktype = SOCK_DGRAM ;
gai_hints.ai_flags = AI_PASSIVE ;
gai_ret = getaddrinfo(NULL, port_str, &gai_hints, &gai_results) ;
if (gai_ret)
{ {
perror("UDP socket creation failed") ; fprintf(stderr, "UDP socket creation failed: getaddrinfo(): %s\n",
gai_strerror(gai_ret)) ;
return -OWL_ERR_SOCKET_CREATE ; return -OWL_ERR_SOCKET_CREATE ;
} }
/* Initialise the server structure */ /* Create the UDP socket:
memset(&server_description, 0, sizeof(server_description)) ; * loop until both socket() and bind() succeed */
server_description.sin_family = AF_INET ; // INET socket for (gai_res = gai_results ; gai_res != NULL ;
// All the connections are accepted: gai_res = gai_res->ai_next)
server_description.sin_addr.s_addr = htonl(INADDR_ANY) ;
server_description.sin_port = htons(port) ; // Listening port
/* Port reservation */
ret = bind(sockfd, (struct sockaddr*) &server_description,
sizeof(server_description)) ;
if (ret < 0)
{ {
perror("Cannot bind the UDP socket") ; sockfd = socket(gai_res->ai_family, gai_res->ai_socktype,
gai_res->ai_protocol) ;
if (sockfd == -1)
continue ;
if (! bind(sockfd, gai_res->ai_addr, gai_res->ai_addrlen))
break ; // Success!
close(sockfd) ; close(sockfd) ;
}
if (gai_res == NULL)
{
fprintf(stderr,
"UDP socket creation failed: socket() or bind().\n") ;
return -OWL_ERR_SOCKET_CREATE ; return -OWL_ERR_SOCKET_CREATE ;
} }