/*
- Unix SMB/Netbios implementation.
- Version 2.0
+ Unix SMB/CIFS implementation.
winbind client common code
Copyright (C) Tim Potter 2000
Copyright (C) Andrew Tridgell 2000
+ Copyright (C) Andrew Bartlett 2002
+
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
Boston, MA 02111-1307, USA.
*/
-#include "winbind_nss_config.h"
-#include "winbindd_nss.h"
+#include "winbind_client.h"
+
+#define CONST_DISCARD(type, ptr) ((type) ((void *) (ptr)))
+#define CONST_ADD(type, ptr) ((type) ((const void *) (ptr)))
/* Global variables. These are effectively the client state information */
-static int established_socket = -1; /* fd for winbindd socket */
+int winbindd_fd = -1; /* fd for winbindd socket */
+
+/* Free a response structure */
+
+void free_response(struct winbindd_response *response)
+{
+ /* Free any allocated extra_data */
+
+ if (response)
+ SAFE_FREE(response->extra_data);
+}
/* Initialise a request structure */
void init_request(struct winbindd_request *request, int request_type)
{
- static char *domain_env;
- static BOOL initialised;
+ request->length = sizeof(struct winbindd_request);
- request->cmd = request_type;
+ request->cmd = (enum winbindd_cmd)request_type;
request->pid = getpid();
- request->domain[0] = '\0';
-
- if (!initialised) {
- initialised = True;
- domain_env = getenv(WINBINDD_DOMAIN_ENV);
- }
- if (domain_env) {
- strncpy(request->domain, domain_env,
- sizeof(request->domain) - 1);
- request->domain[sizeof(request->domain) - 1] = '\0';
- }
}
/* Initialise a response structure */
void close_sock(void)
{
- if (established_socket != -1) {
- close(established_socket);
- established_socket = -1;
+ if (winbindd_fd != -1) {
+ close(winbindd_fd);
+ winbindd_fd = -1;
}
}
+#define CONNECT_TIMEOUT 30
+#define WRITE_TIMEOUT CONNECT_TIMEOUT
+#define READ_TIMEOUT CONNECT_TIMEOUT
+
+/* Make sure socket handle isn't stdin, stdout or stderr */
+#define RECURSION_LIMIT 3
+
+static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
+{
+ int new_fd;
+ if (fd >= 0 && fd <= 2) {
+#ifdef F_DUPFD
+ if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
+ return -1;
+ }
+ /* Paranoia */
+ if (new_fd < 3) {
+ close(new_fd);
+ return -1;
+ }
+ close(fd);
+ return new_fd;
+#else
+ if (limit <= 0)
+ return -1;
+
+ new_fd = dup(fd);
+ if (new_fd == -1)
+ return -1;
+
+ /* use the program stack to hold our list of FDs to close */
+ new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
+ close(fd);
+ return new_fd;
+#endif
+ }
+ return fd;
+}
+
+/****************************************************************************
+ Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
+ else
+ if SYSV use O_NDELAY
+ if BSD use FNDELAY
+ Set close on exec also.
+****************************************************************************/
+
+static int make_safe_fd(int fd)
+{
+ int result, flags;
+ int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
+ if (new_fd == -1) {
+ close(fd);
+ return -1;
+ }
+
+ /* Socket should be nonblocking. */
+#ifdef O_NONBLOCK
+#define FLAG_TO_SET O_NONBLOCK
+#else
+#ifdef SYSV
+#define FLAG_TO_SET O_NDELAY
+#else /* BSD */
+#define FLAG_TO_SET FNDELAY
+#endif
+#endif
+
+ if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
+ close(new_fd);
+ return -1;
+ }
+
+ flags |= FLAG_TO_SET;
+ if (fcntl(new_fd, F_SETFL, flags) == -1) {
+ close(new_fd);
+ return -1;
+ }
+
+#undef FLAG_TO_SET
+
+ /* Socket should be closed on exec() */
+#ifdef FD_CLOEXEC
+ result = flags = fcntl(new_fd, F_GETFD, 0);
+ if (flags >= 0) {
+ flags |= FD_CLOEXEC;
+ result = fcntl( new_fd, F_SETFD, flags );
+ }
+ if (result < 0) {
+ close(new_fd);
+ return -1;
+ }
+#endif
+ return new_fd;
+}
+
/* Connect to winbindd socket */
-static int open_pipe_sock(void)
+static int winbind_named_pipe_sock(const char *dir)
{
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;
- }
+ int fd;
+ int wait_time;
+ int slept;
/* Check permissions on unix socket directory */
- if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
+ if (lstat(dir, &st) == -1) {
return -1;
}
/* Connect to socket */
- strncpy(path, WINBINDD_SOCKET_DIR, sizeof(path) - 1);
+ strncpy(path, dir, sizeof(path) - 1);
path[sizeof(path) - 1] = '\0';
- strncat(path, "/", sizeof(path) - 1);
+ strncat(path, "/", sizeof(path) - 1 - strlen(path));
path[sizeof(path) - 1] = '\0';
- strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
+ strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
path[sizeof(path) - 1] = '\0';
ZERO_STRUCT(sunaddr);
/* Connect to socket */
- if ((established_socket = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+ if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
return -1;
}
-
- if (connect(established_socket, (struct sockaddr *)&sunaddr,
+
+ /* Set socket non-blocking and close on exec. */
+
+ if ((fd = make_safe_fd( fd)) == -1) {
+ return fd;
+ }
+
+ for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
+ wait_time += slept) {
+ struct timeval tv;
+ fd_set w_fds;
+ int ret;
+ int connect_errno = 0, errnosize;
+
+ if (wait_time >= CONNECT_TIMEOUT)
+ goto error_out;
+
+ switch (errno) {
+ case EINPROGRESS:
+ FD_ZERO(&w_fds);
+ FD_SET(fd, &w_fds);
+ tv.tv_sec = CONNECT_TIMEOUT - wait_time;
+ tv.tv_usec = 0;
+
+ ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
+
+ if (ret > 0) {
+ errnosize = sizeof(connect_errno);
+
+ ret = getsockopt(fd, SOL_SOCKET,
+ SO_ERROR, &connect_errno, &errnosize);
+
+ if (ret >= 0 && connect_errno == 0) {
+ /* Connect succeed */
+ goto out;
+ }
+ }
+
+ slept = CONNECT_TIMEOUT;
+ break;
+ case EAGAIN:
+ slept = rand() % 3 + 1;
+ sleep(slept);
+ break;
+ default:
+ goto error_out;
+ }
+
+ }
+
+ out:
+
+ return fd;
+
+ error_out:
+
+ close(fd);
+ return -1;
+
+ if (connect(fd, (struct sockaddr *)&sunaddr,
sizeof(sunaddr)) == -1) {
- close_sock();
- established_socket = -1;
+ close(fd);
return -1;
}
- return established_socket;
+ return fd;
}
-/* Write data to winbindd socket with timeout */
+/* Connect to winbindd socket */
+
+int winbind_open_pipe_sock(void)
+{
+#ifdef HAVE_UNIXSOCKET
+ static pid_t our_pid;
+ struct winbindd_request request;
+ struct winbindd_response response;
+ ZERO_STRUCT(request);
+ ZERO_STRUCT(response);
+
+ if (our_pid != getpid()) {
+ close_sock();
+ our_pid = getpid();
+ }
+
+ if (winbindd_fd != -1) {
+ return winbindd_fd;
+ }
+
+ if ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
+ return -1;
+ }
+
+ /* version-check the socket */
+
+ if ((winbindd_request(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
+ close_sock();
+ return -1;
+ }
+
+ /* try and get priv pipe */
+
+ if (winbindd_request(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
+ int fd;
+ if ((fd = winbind_named_pipe_sock(response.extra_data)) != -1) {
+ close(winbindd_fd);
+ winbindd_fd = fd;
+ }
+ }
+
+ SAFE_FREE(response.extra_data);
+
+ return winbindd_fd;
+#else
+ return -1;
+#endif /* HAVE_UNIXSOCKET */
+}
+
+/* Write data to winbindd socket */
int write_sock(void *buffer, int count)
{
restart:
- if (open_pipe_sock() == -1) {
+ if (winbind_open_pipe_sock() == -1) {
return -1;
}
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);
+ FD_SET(winbindd_fd, &r_fds);
ZERO_STRUCT(tv);
- if ((selret = select(established_socket + 1, &r_fds,
- NULL, NULL, &tv)) == -1) {
+ if (select(winbindd_fd + 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)) {
+ if (!FD_ISSET(winbindd_fd, &r_fds)) {
/* Do the write */
- result = write(established_socket,
+ result = write(winbindd_fd,
(char *)buffer + nwritten,
count - nwritten);
return nwritten;
}
-/* Read data from winbindd socket with timeout */
+/* Read data from winbindd socket */
static int read_sock(void *buffer, int count)
{
int result = 0, nread = 0;
+ int total_time = 0, selret;
/* Read data from socket */
-
while(nread < count) {
+ struct timeval tv;
+ fd_set r_fds;
- result = read(established_socket, (char *)buffer + nread,
- count - nread);
+ /* Catch pipe close on other end by checking if a read()
+ call would not block by calling select(). */
+
+ FD_ZERO(&r_fds);
+ FD_SET(winbindd_fd, &r_fds);
+ ZERO_STRUCT(tv);
+ /* Wait for 5 seconds for a reply. May need to parameterise this... */
+ tv.tv_sec = 5;
+
+ if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
+ close_sock();
+ return -1; /* Select error */
+ }
- if ((result == -1) || (result == 0)) {
+ if (selret == 0) {
+ /* Not ready for read yet... */
+ if (total_time >= 30) {
+ /* Timeout */
+ close_sock();
+ return -1;
+ }
+ total_time += 5;
+ continue;
+ }
+
+ if (FD_ISSET(winbindd_fd, &r_fds)) {
- /* 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. */
+ /* Do the Read */
+
+ result = read(winbindd_fd, (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;
- close_sock();
- return -1;
}
-
- nread += result;
}
return result;
if ((result2 = read_sock(response->extra_data, extra_data_len))
== -1) {
+ free_response(response);
return -1;
}
}
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 */
+/*
+ * send simple types of requests
+ */
-NSS_STATUS winbindd_request(int req_type,
- struct winbindd_request *request,
- struct winbindd_response *response)
+NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
{
struct winbindd_request lrequest;
- struct winbindd_response lresponse;
-
+ char *env;
+ int value;
+
/* Check for our tricky environment variable */
- if (getenv(WINBINDD_DONT_ENV)) {
- return NSS_STATUS_NOTFOUND;
- }
-
- if (!response) {
- ZERO_STRUCT(lresponse);
- response = &lresponse;
+ if ( (env = getenv(WINBINDD_DONT_ENV)) != NULL ) {
+ value = atoi(env);
+ if ( value == 1 )
+ return NSS_STATUS_NOTFOUND;
}
if (!request) {
/* Fill in request and send down pipe */
init_request(request, req_type);
- init_response(response);
if (write_sock(request, sizeof(*request)) == -1) {
return NSS_STATUS_UNAVAIL;
}
+ return NSS_STATUS_SUCCESS;
+}
+
+/*
+ * Get results from winbindd request
+ */
+
+NSS_STATUS winbindd_get_response(struct winbindd_response *response)
+{
+ struct winbindd_response lresponse;
+
+ if (!response) {
+ ZERO_STRUCT(lresponse);
+ response = &lresponse;
+ }
+
+ init_response(response);
+
/* Wait for reply */
if (read_reply(response) == -1) {
return NSS_STATUS_UNAVAIL;
return NSS_STATUS_SUCCESS;
}
+
+/* Handle simple types of requests */
+
+NSS_STATUS winbindd_request(int req_type,
+ struct winbindd_request *request,
+ struct winbindd_response *response)
+{
+ NSS_STATUS status;
+
+ status = winbindd_send_request(req_type, request);
+ if (status != NSS_STATUS_SUCCESS)
+ return(status);
+ return winbindd_get_response(response);
+}
+
+/*************************************************************************
+ A couple of simple functions to disable winbindd lookups and re-
+ enable them
+ ************************************************************************/
+
+/* Use putenv() instead of setenv() in these functions as not all
+ environments have the latter. */
+
+BOOL winbind_off( void )
+{
+ static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=1");
+
+ return putenv(s) != -1;
+}
+
+BOOL winbind_on( void )
+{
+ static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=0");
+
+ return putenv(s) != -1;
+}
git.samba.org / samba.git / blobdiff