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63 lines
1.6 KiB
C
63 lines
1.6 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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int xconnect(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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if (connect(s, (struct sockaddr *)s_addr, sizeof(struct sockaddr_in)) < 0)
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{
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if (ENABLE_FEATURE_CLEAN_UP) close(s);
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bb_perror_msg_and_die("unable to connect to remote host (%s)",
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inet_ntoa(s_addr->sin_addr));
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}
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return s;
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}
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