/* Return a dynamically allocated socket address structure according
to the value returned by either getpeername() or getsockname()
(according to POSIX, applications should not assume a particular
length for `sockaddr_un.sun_path') */
static struct sockaddr *get_peer_sock_name(LPFN_GETPEERNAME socket_func,
int fd)
{
socklen_t socknamelen = sizeof(struct sockaddr) + INITIAL_SOCKNAME_SLACK;
socklen_t actual_socknamelen = socknamelen;
struct sockaddr *sockname = malloc(socknamelen);
if (sockname == NULL)
return NULL;
/* Both getpeername() and getsockname() truncates sockname if
there is not enough space and set the required length in
actual_socknamelen */
if (socket_func(fd, sockname, &actual_socknamelen) == -1)
goto sock_or_realloc_error;
if (actual_socknamelen > socknamelen)
{
struct sockaddr *new_sockname = NULL;
socknamelen = actual_socknamelen;
if ((new_sockname = realloc(sockname, actual_socknamelen)) == NULL)
goto sock_or_realloc_error;
sockname = new_sockname;
if (socket_func(fd, sockname, &actual_socknamelen) == -1 ||
actual_socknamelen > socknamelen)
goto sock_or_realloc_error;
}
return sockname;
sock_or_realloc_error:
free(sockname);
return NULL;
}
int create_lisfd(void)
{
int lisfd = -1;
/* socket */
lisfd = socket_func(AF_INET, SOCK_STREAM, IPPROTO_TCP);
/* set address listen reuse */
int opt = 1;
setsockopt_func(lisfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
/* bind */
struct sockaddr_in saddr;
saddr.sin_family = AF_INET;
saddr.sin_port = htons(8000);
inet_pton_func(AF_INET, "127.0.0.1", &saddr.sin_addr);
bind_func(lisfd, (struct sockaddr *)&saddr, sizeof(saddr));
/* listen */
listen(lisfd, 10);
return lisfd;
}
