/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Connect to host at port using address resolusion from getaddrinfo * */ #include <unistd.h> #include <string.h> #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <netinet/in.h> #include "libbb.h" int xconnect(const char *host, const char *port) { #if CONFIG_FEATURE_IPV6 struct addrinfo hints; struct addrinfo *res; struct addrinfo *addr_info; int error; int s; memset(&hints, 0, sizeof(hints)); /* set-up hints structure */ hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_STREAM; error = getaddrinfo(host, port, &hints, &res); if (error||!res) perror_msg_and_die(gai_strerror(error)); addr_info=res; while (res) { s=socket(res->ai_family, res->ai_socktype, res->ai_protocol); if (s<0) { error=s; res=res->ai_next; continue; } /* try to connect() to res->ai_addr */ error = connect(s, res->ai_addr, res->ai_addrlen); if (error >= 0) break; close(s); res=res->ai_next; } freeaddrinfo(addr_info); if (error < 0) { perror_msg_and_die("Unable to connect to remote host (%s)", host); } return s; #else struct sockaddr_in s_addr; int s = socket(AF_INET, SOCK_STREAM, 0); struct servent *tserv; int port_nr=htons(atoi(port)); struct hostent * he; if (port_nr==0 && (tserv = getservbyname(port, "tcp")) != NULL) port_nr = tserv->s_port; memset(&s_addr, 0, sizeof(struct sockaddr_in)); s_addr.sin_family = AF_INET; s_addr.sin_port = port_nr; he = xgethostbyname(host); memcpy(&s_addr.sin_addr, he->h_addr, sizeof s_addr.sin_addr); if (connect(s, (struct sockaddr *)&s_addr, sizeof s_addr) < 0) { perror_msg_and_die("Unable to connect to remote host (%s)", host); } return s; #endif }