Moved winbind client functions from various odd locations to

nsswitch/wb_client.c

Merge of nsswitch/common.c rename to nsswitch/wb_common.c from TNG.
(This used to be commit f866c18f6be65db67d9d2a6c0b42e1af3b421e6c)

1 files changed, 347 insertions, 0 deletions

diff --git a/source3/nsswitch/wb_common.c b/source3/nsswitch/wb_common.c
new file mode 100644
index 0000000000..5d1f3431cc
--- /dev/null
+++ b/source3/nsswitch/wb_common.c
@@ -0,0 +1,347 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 2.0
+
+   winbind client common code
+
+   Copyright (C) Tim Potter 2000
+   Copyright (C) Andrew Tridgell 2000
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the
+   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA  02111-1307, USA.   
+*/
+
+#include "winbind_nss_config.h"
+#include "winbindd_nss.h"
+
+/* Global variables.  These are effectively the client state information */
+
+static int established_socket = -1;           /* fd for winbindd socket */
+
+/*
+ * Utility and helper functions
+ */
+
+void init_request(struct winbindd_request *req,int rq_type)
+{
+        static char *domain_env;
+        static BOOL initialised;
+
+	req->cmd = rq_type;
+	req->pid = getpid();
+	req->domain[0] = '\0';
+
+	if (!initialised) {
+		initialised = True;
+		domain_env = getenv(WINBINDD_DOMAIN_ENV);
+	}
+
+	if (domain_env) {
+		strncpy(req->domain, domain_env,
+			sizeof(req->domain) - 1);
+		req->domain[sizeof(req->domain) - 1] = '\0';
+	}
+}
+
+/* Close established socket */
+
+void close_sock(void)
+{
+	if (established_socket != -1) {
+		close(established_socket);
+		established_socket = -1;
+	}
+}
+
+/* Connect to winbindd socket */
+
+static int open_pipe_sock(void)
+{
+	struct sockaddr_un sunaddr;
+	static pid_t our_pid;
+	struct stat st;
+	pstring path;
+	
+	if (our_pid != getpid()) {
+		if (established_socket != -1) {
+			close(established_socket);
+		}
+		established_socket = -1;
+		our_pid = getpid();
+	}
+	
+	if (established_socket != -1) {
+		return established_socket;
+	}
+	
+	/* Check permissions on unix socket directory */
+	
+	if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
+		return -1;
+	}
+	
+	if (!S_ISDIR(st.st_mode) || (st.st_uid != 0)) {
+		return -1;
+	}
+	
+	/* Connect to socket */
+	
+	strncpy(path, WINBINDD_SOCKET_DIR, sizeof(path) - 1);
+	path[sizeof(path) - 1] = '\0';
+	
+	strncat(path, "/", sizeof(path) - 1);
+	path[sizeof(path) - 1] = '\0';
+	
+	strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
+	path[sizeof(path) - 1] = '\0';
+	
+	ZERO_STRUCT(sunaddr);
+	sunaddr.sun_family = AF_UNIX;
+	strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
+	
+	/* If socket file doesn't exist, don't bother trying to connect
+	   with retry.  This is an attempt to make the system usable when
+	   the winbindd daemon is not running. */
+
+	if (lstat(path, &st) == -1) {
+		return -1;
+	}
+	
+	/* Check permissions on unix socket file */
+	
+	if (!S_ISSOCK(st.st_mode) || (st.st_uid != 0)) {
+		return -1;
+	}
+	
+	/* Connect to socket */
+	
+	if ((established_socket = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+		return -1;
+	}
+	
+	if (connect(established_socket, (struct sockaddr *)&sunaddr, 
+		    sizeof(sunaddr)) == -1) {
+		close_sock();
+		return -1;
+	}
+        
+	return established_socket;
+}
+
+/* Write data to winbindd socket with timeout */
+
+int write_sock(void *buffer, int count)
+{
+	int result, nwritten;
+	
+	/* Open connection to winbind daemon */
+	
+ restart:
+	
+	if (open_pipe_sock() == -1) {
+		return -1;
+	}
+	
+	/* Write data to socket */
+	
+	nwritten = 0;
+	
+	while(nwritten < count) {
+		struct timeval tv;
+		fd_set r_fds;
+		int selret;
+		
+		/* Catch pipe close on other end by checking if a read()
+		   call would not block by calling select(). */
+
+		FD_ZERO(&r_fds);
+		FD_SET(established_socket, &r_fds);
+		ZERO_STRUCT(tv);
+		
+		if ((selret = select(established_socket + 1, &r_fds, 
+				     NULL, NULL, &tv)) == -1) {
+			close_sock();
+			return -1;                   /* Select error */
+		}
+		
+		/* Write should be OK if fd not available for reading */
+		
+		if (!FD_ISSET(established_socket, &r_fds)) {
+			
+			/* Do the write */
+			
+			result = write(established_socket,
+				       (char *)buffer + nwritten, 
+				       count - nwritten);
+			
+			if ((result == -1) || (result == 0)) {
+				
+				/* Write failed */
+				
+				close_sock();
+				return -1;
+			}
+			
+			nwritten += result;
+			
+		} else {
+			
+			/* Pipe has closed on remote end */
+			
+			close_sock();
+			goto restart;
+		}
+	}
+	
+	return nwritten;
+}
+
+/* Read data from winbindd socket with timeout */
+
+static int read_sock(void *buffer, int count)
+{
+	int result = 0, nread = 0;
+
+	/* Read data from socket */
+	
+	while(nread < count) {
+		
+		result = read(established_socket, (char *)buffer + nread, 
+			      count - nread);
+		
+		if ((result == -1) || (result == 0)) {
+			
+			/* Read failed.  I think the only useful thing we
+			   can do here is just return -1 and fail since the
+			   transaction has failed half way through. */
+			
+			close_sock();
+			return -1;
+		}
+		
+		nread += result;
+	}
+	
+	return result;
+}
+
+/* Read reply */
+
+int read_reply(struct winbindd_response *response)
+{
+	int result1, result2 = 0;
+
+	if (!response) {
+		return -1;
+	}
+	
+	/* Read fixed length response */
+	
+	if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
+	    == -1) {
+		
+		return -1;
+	}
+	
+	/* We actually send the pointer value of the extra_data field from
+	   the server.  This has no meaning in the client's address space
+	   so we clear it out. */
+
+	response->extra_data = NULL;
+
+	/* Read variable length response */
+	
+	if (response->length > sizeof(struct winbindd_response)) {
+		int extra_data_len = response->length - 
+			sizeof(struct winbindd_response);
+		
+		/* Mallocate memory for extra data */
+		
+		if (!(response->extra_data = malloc(extra_data_len))) {
+			return -1;
+		}
+		
+		if ((result2 = read_sock(response->extra_data, extra_data_len))
+		    == -1) {
+			return -1;
+		}
+	}
+	
+	/* Return total amount of data read */
+	
+	return result1 + result2;
+}
+
+/* Free a response structure */
+
+void free_response(struct winbindd_response *response)
+{
+	/* Free any allocated extra_data */
+
+	if (response && response->extra_data) {
+		free(response->extra_data);
+		response->extra_data = NULL;
+	}
+}
+
+/* Handle simple types of requests */
+
+enum nss_status winbindd_request(int req_type, 
+				 struct winbindd_request *request,
+				 struct winbindd_response *response)
+{
+	struct winbindd_request lrequest;
+	struct winbindd_response lresponse;
+
+	/* Check for our tricky environment variable */
+
+	if (getenv(WINBINDD_DONT_ENV)) {
+		return NSS_STATUS_NOTFOUND;
+	}
+
+	if (!response) {
+		ZERO_STRUCT(lresponse);
+		response = &lresponse;
+	}
+
+	if (!request) {
+		ZERO_STRUCT(lrequest);
+		request = &lrequest;
+	}
+	
+	/* Fill in request and send down pipe */
+	init_request(request, req_type);
+	
+	if (write_sock(request, sizeof(*request)) == -1) {
+		return NSS_STATUS_UNAVAIL;
+	}
+	
+	/* Wait for reply */
+	if (read_reply(response) == -1) {
+		return NSS_STATUS_UNAVAIL;
+	}
+
+	/* Throw away extra data if client didn't request it */
+	if (response == &lresponse) {
+		free_response(response);
+	}
+
+	/* Copy reply data from socket */
+	if (response->result != WINBINDD_OK) {
+		return NSS_STATUS_NOTFOUND;
+	}
+	
+	return NSS_STATUS_SUCCESS;
+}