diff options
Diffstat (limited to 'source3/nsswitch/common.c')
| -rw-r--r-- | source3/nsswitch/common.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/source3/nsswitch/common.c b/source3/nsswitch/common.c new file mode 100644 index 0000000000..be0b24cc5d --- /dev/null +++ b/source3/nsswitch/common.c @@ -0,0 +1,282 @@ +/* + 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 "ntdom_config.h" +#include "winbindd_ntdom.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, nread; + + /* Read data from socket */ + + nread = 0; + + 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; + + if (!response) { + return -1; + } + + /* Read fixed length response */ + + if ((result1 = read_sock(response, sizeof(struct winbindd_response))) + == -1) { + + return -1; + } + + /* 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; +} + |