Port sshtosnmp to FreeBSD.

Completes 3346619 (libsnmp: Port the SSH domain transport to FreeBSD)

Author: nielsb

apps/sshtosnmp.c

@@ -26,6 +26,9 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <stdio.h>
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
 
 #ifndef MAXPATHLEN
 #warning no system max path length detected
@@ -87,6 +90,7 @@ main(int argc, char **argv) {
         exit(1);
     }
 
+#if defined(SO_PASSCRED)
     /* set the SO_PASSCRED option so we can pass uid */
     /* XXX: according to the unix(1) manual this shouldn't be needed
        on the sending side? */
@@ -95,6 +99,15 @@ main(int argc, char **argv) {
         setsockopt(sock, SOL_SOCKET, SO_PASSCRED, (void *) &one,
                    sizeof(one));
     }
+#elif defined(LOCAL_CREDS)
+    {
+        int one = 1;
+        setsockopt(sock, SOL_SOCKET, LOCAL_CREDS, (void *) &one,
+                   sizeof(one));
+    }
+#else
+#error Cannot pass credentials
+#endif
 
     if (connect(sock, (struct sockaddr *) &addr,
                 sizeof(struct sockaddr_un)) != 0) {
@@ -124,21 +137,36 @@ main(int argc, char **argv) {
     {
         struct msghdr msg = { 0 };
         struct iovec iov = { buf, buf_len };
-        struct ucred ouruser = { 0 };
         struct cmsghdr *cmsg;
-	char cmsgbuf[CMSG_SPACE(sizeof(ouruser))];
+#if defined(SCM_CREDENTIALS)
+        struct ucred ouruser = { 0 };
+        char cmsgbuf[sizeof(ouruser)];
 
         ouruser.uid = getuid();
         ouruser.gid = getgid();
         ouruser.pid = getpid();
+#elif defined(SCM_CREDS)
+        struct cmsgcred ouruser = { 0 };
+        char cmsgbuf[2*4096];
+
+        ouruser.cmcred_uid = getuid();
+        ouruser.cmcred_gid = getgid();
+        ouruser.cmcred_pid = getpid();
+#else
+#error cannot encode credentials
+#endif
 
         msg.msg_control = cmsgbuf;
         msg.msg_controllen = sizeof(cmsgbuf);
 
 	cmsg = CMSG_FIRSTHDR(&msg);
 	cmsg->cmsg_len = CMSG_LEN(sizeof(ouruser));
 	cmsg->cmsg_level = SOL_SOCKET;
-	cmsg->cmsg_type = SCM_CREDENTIALS;
+#if defined(SCM_CREDENTIALS)
+        cmsg->cmsg_type = SCM_CREDENTIALS;
+#elif defined(SCM_CREDS)
+        cmsg->cmsg_type = SCM_CREDS;
+#endif
 	memcpy(CMSG_DATA(cmsg), &ouruser, sizeof(ouruser));
 
 	msg.msg_name = NULL;