145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Connect to host at port using address resolution from getaddrinfo
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*
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*/
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#include "libbb.h"
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/* Return network byte ordered port number for a service.
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* If "port" is a number use it as the port.
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* If "port" is a name it is looked up in /etc/services, if it isnt found return
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* default_port
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*/
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unsigned short bb_lookup_port(const char *port, const char *protocol, unsigned short default_port)
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{
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unsigned short port_nr = htons(default_port);
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if (port) {
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char *endptr;
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int old_errno;
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long port_long;
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/* Since this is a lib function, we're not allowed to reset errno to 0.
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* Doing so could break an app that is deferring checking of errno. */
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old_errno = errno;
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errno = 0;
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port_long = strtol(port, &endptr, 10);
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if (errno != 0 || *endptr!='\0' || endptr==port || port_long < 0 || port_long > 65535) {
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struct servent *tserv = getservbyname(port, protocol);
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if (tserv) {
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port_nr = tserv->s_port;
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}
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} else {
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port_nr = htons(port_long);
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}
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errno = old_errno;
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}
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return port_nr;
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}
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void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
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{
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struct hostent *he;
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memset(s_in, 0, sizeof(struct sockaddr_in));
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s_in->sin_family = AF_INET;
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he = xgethostbyname(host);
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memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
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}
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void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
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{
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if (connect(s, s_addr, addrlen) < 0) {
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if (ENABLE_FEATURE_CLEAN_UP) close(s);
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if (s_addr->sa_family == AF_INET)
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bb_perror_msg_and_die("cannot connect to remote host (%s)",
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inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
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bb_perror_msg_and_die("cannot connect to remote host");
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}
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}
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int xconnect_tcp_v4(struct sockaddr_in *s_addr)
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{
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int s = xsocket(AF_INET, SOCK_STREAM, 0);
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xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
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return s;
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}
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int dotted2sockaddr(const char *dotted, struct sockaddr* sp, int socklen)
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{
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union {
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struct in_addr a4;
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#if ENABLE_FEATURE_IPV6
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struct in6_addr a6;
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#endif
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} a;
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/* TODO maybe: port spec? like n.n.n.n:nn */
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#if ENABLE_FEATURE_IPV6
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if (socklen >= sizeof(struct sockaddr_in6)
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&& inet_pton(AF_INET6, dotted, &a.a6) > 0
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) {
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((struct sockaddr_in6*)sp)->sin6_family = AF_INET6;
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((struct sockaddr_in6*)sp)->sin6_addr = a.a6;
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/* ((struct sockaddr_in6*)sp)->sin6_port = */
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return 0; /* success */
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}
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#endif
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if (socklen >= sizeof(struct sockaddr_in)
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&& inet_pton(AF_INET, dotted, &a.a4) > 0
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) {
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((struct sockaddr_in*)sp)->sin_family = AF_INET;
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((struct sockaddr_in*)sp)->sin_addr = a.a4;
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/* ((struct sockaddr_in*)sp)->sin_port = */
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return 0; /* success */
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}
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return 1;
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}
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int xsocket_stream_ip4or6(sa_family_t *fp)
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{
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int fd;
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#if ENABLE_FEATURE_IPV6
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fd = socket(AF_INET6, SOCK_STREAM, 0);
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if (fp) *fp = AF_INET6;
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if (fd < 0)
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#endif
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{
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fd = xsocket(AF_INET, SOCK_STREAM, 0);
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if (fp) *fp = AF_INET;
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}
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return fd;
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}
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int create_and_bind_socket_ip4or6(const char *hostaddr, int port)
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{
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static const int on = 1;
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int fd;
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sockaddr_inet sa;
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memset(&sa, 0, sizeof(sa));
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if (hostaddr) {
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if (dotted2sockaddr(hostaddr, &sa.sa, sizeof(sa)))
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bb_error_msg_and_die("bad address '%s'", hostaddr);
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/* user specified bind addr dictates family */
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fd = xsocket(sa.sa.sa_family, SOCK_STREAM, 0);
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} else
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fd = xsocket_stream_ip4or6(&sa.sa.sa_family);
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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/* if (port >= 0) { */
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#if ENABLE_FEATURE_IPV6
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if (sa.sa.sa_family == AF_INET6 /* && !sa.sin6.sin6_port */)
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sa.sin6.sin6_port = htons(port);
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#endif
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if (sa.sa.sa_family == AF_INET /* && !sa.sin.sin_port */)
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sa.sin.sin_port = htons(port);
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/* } */
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xbind(fd, &sa.sa, sizeof(sa));
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return fd;
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}
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