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|
--- ez-ipupdate.c.orig
+++ ez-ipupdate.c
@@ -172,6 +172,17 @@
# ifdef HAVE_SYS_SOCKIO_H
# include <sys/sockio.h>
# endif
+# ifdef __linux__
+/*# include <linux/if.h> */
+# include <linux/netlink.h>
+# include <linux/rtnetlink.h>
+/* Under Linux, we reopen socket in get_if_addr() every time */
+# define socketopen(sock)
+# define socketclose(sock)
+# else
+# define socketopen(sock) sock = socket(AF_INET, SOCK_STREAM, 0)
+# define socketclose(sock) close(sock)
+# endif
#endif
#include <dprintf.h>
@@ -1605,6 +1616,114 @@
int get_if_addr(int sock, char *name, struct sockaddr_in *sin)
{
#ifdef IF_LOOKUP
+#ifdef __linux__
+ struct {
+ struct nlmsghdr nlmsg_info;
+ struct ifaddrmsg ifaddrmsg_info;
+ char buffer[2048];
+ } req;
+ struct nlmsghdr *curr;
+ int len;
+ char buf[8192];
+
+ /* open a socket and bind it.
+ Under non-linux, the socket can be kept open, but it seems under
+ linux we cannot use the same socket for several requests reliable
+ [although sometimes it works...] */
+ static struct sockaddr_nl local;
+ sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if(sock < 0) {
+ perror("socket");
+ return -1;
+ }
+ local.nl_family = AF_NETLINK;
+ local.nl_pad = 0;
+ local.nl_pid = getpid();
+ local.nl_groups = 0;
+ if(bind(sock, (struct sockaddr*) &local, sizeof(local)) < 0) {
+ perror("bind");
+ close(sock);
+ return -1;
+ }
+
+ memset(&req, 0, sizeof(req));
+ req.nlmsg_info.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+ req.nlmsg_info.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+ req.nlmsg_info.nlmsg_type = RTM_GETADDR;
+ req.nlmsg_info.nlmsg_pid = getpid();
+ req.ifaddrmsg_info.ifa_family = AF_INET;
+ if(send(sock, &req, req.nlmsg_info.nlmsg_len, 0) < 0) {
+ perror("sendmsg(sock)");
+ close(sock);
+ return -1;
+ }
+
+ len = recv(sock, buf, sizeof(buf), 0);
+ close(sock);
+ if(len < 0) {
+ perror("recv");
+ return -1;
+ } else if(len == 0) {
+ dprintf((stderr, "No interfaces found"));
+ return -1;
+ }
+
+ /* Initialize sin except for address */
+ bzero(sin, sizeof(struct sockaddr_in));
+ sin->sin_family = AF_INET;
+
+ /* We take the last non-private IP with matching name */
+ int found = 0;
+ curr = (struct nlmsghdr *) buf;
+ for(; NLMSG_OK(curr, len); curr = NLMSG_NEXT(curr, len)) {
+ struct ifaddrmsg *curraddr = (struct ifaddrmsg *) NLMSG_DATA(curr);
+ struct rtattr *datalist = (struct rtattr *) IFA_RTA(curraddr);
+ int datalen = IFA_PAYLOAD(curr);
+ int mystat = 0;
+ struct in_addr sin_addr;
+ in_addr_t addr;
+ for(; RTA_OK(datalist, datalen); datalist = RTA_NEXT(datalist, datalen)) {
+ switch(datalist->rta_type) {
+ case IFA_LABEL:
+ if(strcmp((char *)RTA_DATA(datalist), name) != 0)
+ mystat = -1;
+ break;
+ case IFA_LOCAL:
+ addr = ((struct in_addr *)RTA_DATA(datalist))->s_addr;
+ /* addr: 192.168.0.0/16 || 172.16.0.0/12 || 10.0.0.0/8 */
+ if(((addr & 0xFFFF) == 0xA8C0)
+ || ((addr & 0xF0FF) == 0x10AC)
+ || ((addr & 0xFF) == 0x0A)) {
+ mystat = -1;
+ }
+ else {
+ /* We must not store yet sin->sin_addr, since name might not match */
+ sin_addr = *((struct in_addr *)RTA_DATA(datalist));
+ mystat = 1;
+ }
+ break;
+ default:
+ break;
+ }
+ if(mystat < 0)
+ break;
+ }
+ if(mystat > 0) {
+ sin->sin_addr = sin_addr;
+ found = 1;
+ /* If you want to take the first non-private IP with matching name
+ uncomment the next break command:
+ break; */
+ }
+ }
+ if(found) {
+ dprintf((stderr, "%s: %s\n", name, inet_ntoa(sin->sin_addr)));
+ return 0;
+ }
+ dprintf((stderr, "%s: %s\n", name, "has no non-private address"));
+ return -1;
+#else
+/* ifndef __linux__ */
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
@@ -1638,7 +1757,10 @@
return -1;
}
return -1;
+#endif
+/* endif __linux__ */
#else
+/* ifndef IF_LOOKUP */
return -1;
#endif
}
@@ -4490,7 +4612,7 @@
#ifdef IF_LOOKUP
if(options & OPT_DAEMON)
{
- sock = socket(AF_INET, SOCK_STREAM, 0);
+ socketopen(sock);
}
#endif
@@ -4745,12 +4867,12 @@
struct sockaddr_in sin;
int sock;
- sock = socket(AF_INET, SOCK_STREAM, 0);
+ socketopen(sock);
if(get_if_addr(sock, interface, &sin) != 0)
{
exit(1);
}
- close(sock);
+ socketclose(sock);
snprintf(ipbuf, sizeof(ipbuf), "%s", inet_ntoa(sin.sin_addr));
#else
fprintf(stderr, "interface lookup not enabled at compile time\n");
@@ -4791,7 +4913,7 @@
struct sockaddr_in sin;
int sock;
- sock = socket(AF_INET, SOCK_STREAM, 0);
+ socketopen(sock);
if(get_if_addr(sock, interface, &sin) == 0)
{
if(address) { free(address); }
@@ -4802,7 +4924,7 @@
show_message("could not resolve ip address for %s.\n", interface);
exit(1);
}
- close(sock);
+ socketclose(sock);
}
for(i=0; i<ntrys; i++)
@@ -4846,12 +4968,12 @@
struct sockaddr_in sin;
int sock;
- sock = socket(AF_INET, SOCK_STREAM, 0);
+ socketopen(sock);
if(get_if_addr(sock, interface, &sin) != 0)
{
exit(1);
}
- close(sock);
+ socketclose(sock);
snprintf(ipbuf, sizeof(ipbuf), "%s", inet_ntoa(sin.sin_addr));
#else
fprintf(stderr, "interface lookup not enabled at compile time\n");
@@ -4878,7 +5000,7 @@
}
#ifdef IF_LOOKUP
- if(sock > 0) { close(sock); }
+ if(sock > 0) { socketclose(sock); }
#endif
if(address) { free(address); }
|
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