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-rw-r--r--source3/nsswitch/wb_common.c347
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 00000000000..5d1f3431ccf
--- /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;
+}
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