/*
* Utility routines.
*
- * Connect to host at port using address resolusion from getaddrinfo
+ * Connect to host at port using address resolution from getaddrinfo
*
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
+#include <errno.h>
#include <netdb.h>
+#include <sys/socket.h>
#include <netinet/in.h>
+#include <arpa/inet.h>
#include "libbb.h"
-int xconnect(const char *host, const char *port)
+/* Return network byte ordered port number for a service.
+ * If "port" is a number use it as the port.
+ * If "port" is a name it is looked up in /etc/services, if it isnt found return
+ * default_port
+ */
+unsigned short bb_lookup_port(const char *port, const char *protocol, unsigned short default_port)
{
-#ifdef CONFIG_FEATURE_IPV6
- struct addrinfo hints;
- struct addrinfo *res;
- struct addrinfo *addr_info;
- int error;
- int s;
+ unsigned short port_nr = htons(default_port);
+ if (port) {
+ char *endptr;
+ int old_errno;
+ long port_long;
- 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)
- bb_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;
+ /* Since this is a lib function, we're not allowed to reset errno to 0.
+ * Doing so could break an app that is deferring checking of errno. */
+ old_errno = errno;
+ errno = 0;
+ port_long = strtol(port, &endptr, 10);
+ if (errno != 0 || *endptr!='\0' || endptr==port || port_long < 0 || port_long > 65535) {
+ struct servent *tserv = getservbyname(port, protocol);
+ if (tserv) {
+ port_nr = tserv->s_port;
+ }
+ } else {
+ port_nr = htons(port_long);
}
- /* 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)
- {
- bb_perror_msg_and_die("Unable to connect to remote host (%s)", host);
+ errno = old_errno;
}
- 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;
+ return port_nr;
+}
- memset(&s_addr, 0, sizeof(struct sockaddr_in));
- s_addr.sin_family = AF_INET;
- s_addr.sin_port = port_nr;
+void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
+{
+ struct hostent *he;
+ memset(s_in, 0, sizeof(struct sockaddr_in));
+ s_in->sin_family = AF_INET;
he = xgethostbyname(host);
- memcpy(&s_addr.sin_addr, he->h_addr, sizeof s_addr.sin_addr);
+ memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
+}
- if (connect(s, (struct sockaddr *)&s_addr, sizeof s_addr) < 0)
+int xconnect(struct sockaddr_in *s_addr)
+{
+ int s = socket(AF_INET, SOCK_STREAM, 0);
+ if (connect(s, (struct sockaddr_in *)s_addr, sizeof(struct sockaddr_in)) < 0)
{
- bb_perror_msg_and_die("Unable to connect to remote host (%s)", host);
+ if (ENABLE_FEATURE_CLEAN_UP) close(s);
+ bb_perror_msg_and_die("Unable to connect to remote host (%s)",
+ inet_ntoa(s_addr->sin_addr));
}
return s;
-#endif
}