diff options
Diffstat (limited to 'examples/libsmbclient/smbwrapper/smbw.c')
| -rw-r--r-- | examples/libsmbclient/smbwrapper/smbw.c | 928 |
1 files changed, 928 insertions, 0 deletions
diff --git a/examples/libsmbclient/smbwrapper/smbw.c b/examples/libsmbclient/smbwrapper/smbw.c new file mode 100644 index 0000000000..e2e44c1f0f --- /dev/null +++ b/examples/libsmbclient/smbwrapper/smbw.c @@ -0,0 +1,928 @@ +/* + Unix SMB/Netbios implementation. + Version 2.0 + SMB wrapper functions + Copyright (C) Andrew Tridgell 1998 + Copyright (C) Derrell Lipman 2003-2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <stdarg.h> +#include <assert.h> +#include "smbw.h" +#include "bsd-strlfunc.h" + +typedef enum StartupType +{ + StartupType_Fake, + StartupType_Real +} StartupType; + +int smbw_fd_map[__FD_SETSIZE]; +int smbw_ref_count[__FD_SETSIZE]; +char smbw_cwd[PATH_MAX]; +char smbw_prefix[] = SMBW_PREFIX; + +/* needs to be here because of dumb include files on some systems */ +int creat_bits = O_WRONLY|O_CREAT|O_TRUNC; + +int smbw_initialized = 0; + +static int debug_level = 0; + +static SMBCCTX *smbw_ctx; + +extern int smbw_debug; + + +/***************************************************** +smbw_ref -- manipulate reference counts +******************************************************/ +int smbw_ref(int client_fd, Ref_Count_Type type, ...) +{ + va_list ap; + + /* client id values begin at SMBC_BASE_FC. */ + client_fd -= SMBC_BASE_FD; + + va_start(ap, type); + switch(type) + { + case SMBW_RCT_Increment: + return ++smbw_ref_count[client_fd]; + + case SMBW_RCT_Decrement: + return --smbw_ref_count[client_fd]; + + case SMBW_RCT_Get: + return smbw_ref_count[client_fd]; + + case SMBW_RCT_Set: + return (smbw_ref_count[client_fd] = va_arg(ap, int)); + } + va_end(ap); + + /* never gets here */ + return -1; +} + + +/* + * Return a username and password given a server and share name + * + * Returns 0 upon success; + * non-zero otherwise, and errno is set to indicate the error. + */ +static void get_envvar_auth_data(const char *srv, + const char *shr, + char *wg, int wglen, + char *un, int unlen, + char *pw, int pwlen) +{ + char *u; + char *p; + char *w; + + /* Fall back to environment variables */ + + w = getenv("WORKGROUP"); + if (w == NULL) w = ""; + + u = getenv("USER"); + if (u == NULL) u = ""; + + p = getenv("PASSWORD"); + if (p == NULL) p = ""; + + smbw_strlcpy(wg, w, wglen); + smbw_strlcpy(un, u, unlen); + smbw_strlcpy(pw, p, pwlen); +} + +static smbc_get_auth_data_fn get_auth_data_fn = get_envvar_auth_data; + +/***************************************************** +set the get auth data function +******************************************************/ +void smbw_set_auth_data_fn(smbc_get_auth_data_fn fn) +{ + get_auth_data_fn = fn; +} + + +/***************************************************** +ensure that all connections are terminated upon exit +******************************************************/ +static void do_shutdown(void) +{ + if (smbw_ctx != NULL) { + smbc_free_context(smbw_ctx, 1); + } +} + + +/***************************************************** +initialise structures +*******************************************************/ +static void do_init(StartupType startupType) +{ + int i; + char *p; + + smbw_initialized = 1; /* this must be first to avoid recursion! */ + + smbw_ctx = NULL; /* don't free context until it's established */ + + /* initially, no file descriptors are mapped */ + for (i = 0; i < __FD_SETSIZE; i++) { + smbw_fd_map[i] = -1; + smbw_ref_count[i] = 0; + } + + /* See if we've been told to start in a particular directory */ + if ((p=getenv("SMBW_DIR")) != NULL) { + smbw_strlcpy(smbw_cwd, p, PATH_MAX); + + /* we don't want the old directory to be busy */ + (* smbw_libc.chdir)("/"); + + } else { + *smbw_cwd = '\0'; + } + + if ((p=getenv("DEBUG"))) { + debug_level = atoi(p); + } + + if ((smbw_ctx = smbc_new_context()) == NULL) { + fprintf(stderr, "Could not create a context.\n"); + exit(1); + } + + smbc_setDebug(smbw_ctx, debug_level); + smbc_setFunctionAuthData(smbw_ctx, get_auth_data_fn); + smbc_setOptionBrowseMaxLmbCount(smbw_ctx, 0); + smbc_setOptionUrlEncodeReaddirEntries(smbw_ctx, 1); + smbc_setOptionOneSharePerServer(smbw_ctx, 1); + + if (smbc_init_context(smbw_ctx) == NULL) { + fprintf(stderr, "Could not initialize context.\n"); + exit(1); + } + + smbc_set_context(smbw_ctx); + + /* if not real startup, exit handler has already been established */ + if (startupType == StartupType_Real) { + atexit(do_shutdown); + } +} + +/***************************************************** +initialise structures, real start up vs a fork() +*******************************************************/ +void smbw_init(void) +{ + do_init(StartupType_Real); +} + + +/***************************************************** +determine if a file descriptor is a smb one +*******************************************************/ +int smbw_fd(int smbw_fd) +{ + SMBW_INIT(); + + return (smbw_fd >= 0 && + smbw_fd < __FD_SETSIZE && + smbw_fd_map[smbw_fd] >= SMBC_BASE_FD); /* minimum smbc_ fd */ +} + + +/***************************************************** +determine if a path is a smb one +*******************************************************/ +int smbw_path(const char *name) +{ + int len; + int ret; + int saved_errno; + + saved_errno = errno; + + SMBW_INIT(); + + len = strlen(smbw_prefix); + + ret = ((strncmp(name, smbw_prefix, len) == 0 && + (name[len] == '\0' || name[len] == '/')) || + (*name != '/' && *smbw_cwd != '\0')); + + errno = saved_errno; + return ret; +} + + +/***************************************************** +remove redundent stuff from a filename +*******************************************************/ +void smbw_clean_fname(char *name) +{ + char *p, *p2; + int l; + int modified = 1; + + if (!name) return; + + DEBUG(10, ("Clean [%s]...\n", name)); + + while (modified) { + modified = 0; + + if ((p=strstr(name,"/./"))) { + modified = 1; + while (*p) { + p[0] = p[2]; + p++; + } + DEBUG(10, ("\tclean 1 (/./) produced [%s]\n", name)); + } + + if ((p=strstr(name,"//"))) { + modified = 1; + while (*p) { + p[0] = p[1]; + p++; + } + DEBUG(10, ("\tclean 2 (//) produced [%s]\n", name)); + } + + if (strcmp(name,"/../")==0) { + modified = 1; + name[1] = 0; + DEBUG(10,("\tclean 3 (^/../$) produced [%s]\n", name)); + } + + if ((p=strstr(name,"/../"))) { + modified = 1; + for (p2 = (p > name ? p-1 : p); p2 > name; p2--) { + if (p2[0] == '/') break; + } + if (p2 > name) p2++; + while (*p2) { + p2[0] = p[3]; + p2++; + p++; + } + DEBUG(10, ("\tclean 4 (/../) produced [%s]\n", name)); + } + + if (strcmp(name,"/..")==0) { + modified = 1; + name[1] = 0; + DEBUG(10, ("\tclean 5 (^/..$) produced [%s]\n", name)); + } + + l = strlen(name); + p = l>=3?(name+l-3):name; + if (strcmp(p,"/..")==0) { + modified = 1; + for (p2=p-1;p2>name;p2--) { + if (p2[0] == '/') break; + } + if (p2==name) { + p[0] = '/'; + p[1] = 0; + } else { + p2[0] = 0; + } + DEBUG(10, ("\tclean 6 (/..) produced [%s]\n", name)); + } + + l = strlen(name); + p = l>=2?(name+l-2):name; + if (strcmp(p,"/.")==0) { + modified = 1; + if (p == name) { + p[1] = 0; + } else { + p[0] = 0; + } + DEBUG(10, ("\tclean 7 (/.) produced [%s]\n", name)); + } + + if (strncmp(p=name,"./",2) == 0) { + modified = 1; + do { + p[0] = p[2]; + } while (*p++); + DEBUG(10, ("\tclean 8 (^./) produced [%s]\n", name)); + } + + l = strlen(p=name); + if (l > 1 && p[l-1] == '/') { + modified = 1; + p[l-1] = 0; + DEBUG(10, ("\tclean 9 (/) produced [%s]\n", name)); + } + } +} + +void smbw_fix_path(const char *src, char *dest) +{ + const char *p; + int len = strlen(smbw_prefix); + + if (*src == '/') { + for (p = src + len; *p == '/'; p++) + ; + snprintf(dest, PATH_MAX, "smb://%s", p); + } else { + snprintf(dest, PATH_MAX, "%s/%s", smbw_cwd, src); + } + + smbw_clean_fname(dest + 5); + + DEBUG(10, ("smbw_fix_path(%s) returning [%s]\n", src, dest)); +} + + + +/***************************************************** +a wrapper for open() +*******************************************************/ +int smbw_open(const char *fname, int flags, mode_t mode) +{ + int client_fd; + int smbw_fd; + char path[PATH_MAX]; + + SMBW_INIT(); + + if (!fname) { + errno = EINVAL; + return -1; + } + + smbw_fd = (smbw_libc.open)(SMBW_DUMMY, O_WRONLY, 0200); + if (smbw_fd == -1) { + errno = EMFILE; + return -1; + } + + smbw_fix_path(fname, path); + if (flags == creat_bits) { + client_fd = smbc_creat(path, mode); + } else { + client_fd = smbc_open(path, flags, mode); + } + + if (client_fd < 0) { + (* smbw_libc.close)(smbw_fd); + return -1; + } + + smbw_fd_map[smbw_fd] = client_fd; + smbw_ref(client_fd, SMBW_RCT_Increment); + return smbw_fd; +} + + +/***************************************************** +a wrapper for pread() + +there should really be an smbc_pread() to avoid the two +lseek()s required in this kludge. +*******************************************************/ +ssize_t smbw_pread(int smbw_fd, void *buf, size_t count, SMBW_OFF_T ofs) +{ + int client_fd; + ssize_t ret; + int saved_errno; + SMBW_OFF_T old_ofs; + + if (count == 0) { + return 0; + } + + client_fd = smbw_fd_map[smbw_fd]; + + if ((old_ofs = smbc_lseek(client_fd, 0, SEEK_CUR)) < 0 || + smbc_lseek(client_fd, ofs, SEEK_SET) < 0) { + return -1; + } + + if ((ret = smbc_read(client_fd, buf, count)) < 0) { + saved_errno = errno; + (void) smbc_lseek(client_fd, old_ofs, SEEK_SET); + errno = saved_errno; + return -1; + } + + return ret; +} + +/***************************************************** +a wrapper for read() +*******************************************************/ +ssize_t smbw_read(int smbw_fd, void *buf, size_t count) +{ + int client_fd; + + client_fd = smbw_fd_map[smbw_fd]; + + return smbc_read(client_fd, buf, count); +} + + + +/***************************************************** +a wrapper for write() +*******************************************************/ +ssize_t smbw_write(int smbw_fd, void *buf, size_t count) +{ + int client_fd; + + client_fd = smbw_fd_map[smbw_fd]; + + return smbc_write(client_fd, buf, count); +} + +/***************************************************** +a wrapper for pwrite() +*******************************************************/ +ssize_t smbw_pwrite(int smbw_fd, void *buf, size_t count, SMBW_OFF_T ofs) +{ + int saved_errno; + int client_fd; + ssize_t ret; + SMBW_OFF_T old_ofs; + + if (count == 0) { + return 0; + } + + client_fd = smbw_fd_map[smbw_fd]; + + if ((old_ofs = smbc_lseek(client_fd, 0, SEEK_CUR)) < 0 || + smbc_lseek(client_fd, ofs, SEEK_SET) < 0) { + return -1; + } + + if ((ret = smbc_write(client_fd, buf, count)) < 0) { + saved_errno = errno; + (void) smbc_lseek(client_fd, old_ofs, SEEK_SET); + errno = saved_errno; + return -1; + } + + return ret; +} + +/***************************************************** +a wrapper for close() +*******************************************************/ +int smbw_close(int smbw_fd) +{ + int client_fd; + + client_fd = smbw_fd_map[smbw_fd]; + + if (smbw_ref(client_fd, SMBW_RCT_Decrement) > 0) { + return 0; + } + + (* smbw_libc.close)(smbw_fd); + smbw_fd_map[smbw_fd] = -1; + return smbc_close(client_fd); +} + + +/***************************************************** +a wrapper for fcntl() +*******************************************************/ +int smbw_fcntl(int smbw_fd, int cmd, long arg) +{ + return 0; +} + + +/***************************************************** +a wrapper for access() +*******************************************************/ +int smbw_access(const char *name, int mode) +{ + struct SMBW_stat st; + + SMBW_INIT(); + + if (smbw_stat(name, &st)) return -1; + + if (((mode & R_OK) && !(st.s_mode & S_IRUSR)) || + ((mode & W_OK) && !(st.s_mode & S_IWUSR)) || + ((mode & X_OK) && !(st.s_mode & S_IXUSR))) { + errno = EACCES; + return -1; + } + + return 0; +} + +/***************************************************** +a wrapper for readlink() - needed for correct errno setting +*******************************************************/ +int smbw_readlink(const char *fname, char *buf, size_t bufsize) +{ + struct SMBW_stat st; + int ret; + + SMBW_INIT(); + + ret = smbw_stat(fname, &st); + if (ret != 0) { + return -1; + } + + /* it exists - say it isn't a link */ + errno = EINVAL; + return -1; +} + + +/***************************************************** +a wrapper for unlink() +*******************************************************/ +int smbw_unlink(const char *fname) +{ + char path[PATH_MAX]; + + SMBW_INIT(); + + smbw_fix_path(fname, path); + return smbc_unlink(path); +} + + +/***************************************************** +a wrapper for rename() +*******************************************************/ +int smbw_rename(const char *oldname, const char *newname) +{ + char path_old[PATH_MAX]; + char path_new[PATH_MAX]; + + SMBW_INIT(); + + smbw_fix_path(oldname, path_old); + smbw_fix_path(newname, path_new); + return smbc_rename(path_old, path_new); +} + + +/***************************************************** +a wrapper for utimes +*******************************************************/ +int smbw_utimes(const char *fname, void *buf) +{ + char path[PATH_MAX]; + + smbw_fix_path(fname, path); + return smbc_utimes(path, buf); +} + + +/***************************************************** +a wrapper for utime +*******************************************************/ +int smbw_utime(const char *fname, void *buf) +{ + char path[PATH_MAX]; + + smbw_fix_path(fname, path); + return smbc_utime(path, buf); +} + +/***************************************************** +a wrapper for chown() +*******************************************************/ +int smbw_chown(const char *fname, uid_t owner, gid_t group) +{ + /* always indiciate that this is not supported. */ + errno = ENOTSUP; + return -1; +} + +/***************************************************** +a wrapper for chmod() +*******************************************************/ +int smbw_chmod(const char *fname, mode_t newmode) +{ + char path[PATH_MAX]; + + smbw_fix_path(fname, path); + return smbc_chmod(path, newmode); +} + + +/***************************************************** +a wrapper for lseek() +*******************************************************/ +SMBW_OFF_T smbw_lseek(int smbw_fd, + SMBW_OFF_T offset, + int whence) +{ + int client_fd; + SMBW_OFF_T ret; + + client_fd = smbw_fd_map[smbw_fd]; + + ret = smbc_lseek(client_fd, offset, whence); + if (smbw_debug) + { + printf("smbw_lseek(%d/%d, 0x%llx) returned 0x%llx\n", + smbw_fd, client_fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +/***************************************************** +a wrapper for dup() +*******************************************************/ +int smbw_dup(int smbw_fd) +{ + int fd2; + + fd2 = (smbw_libc.dup)(smbw_fd); + if (fd2 == -1) { + return -1; + } + + smbw_fd_map[fd2] = smbw_fd_map[smbw_fd]; + smbw_ref(smbw_fd_map[smbw_fd], SMBW_RCT_Increment); + return fd2; +} + + +/***************************************************** +a wrapper for dup2() +*******************************************************/ +int smbw_dup2(int smbw_fd, int fd2) +{ + if ((* smbw_libc.dup2)(smbw_fd, fd2) != fd2) { + return -1; + } + + smbw_fd_map[fd2] = smbw_fd_map[smbw_fd]; + smbw_ref(smbw_fd_map[smbw_fd], SMBW_RCT_Increment); + return fd2; +} + + +/***************************************************** +when we fork we have to close all connections and files +in the child +*******************************************************/ +int smbw_fork(void) +{ + int i; + pid_t child_pid; + int p[2]; + char c = 0; + + SMBW_INIT(); + + if (pipe(p)) return (* smbw_libc.fork)(); + + child_pid = (* smbw_libc.fork)(); + + if (child_pid) { + /* block the parent for a moment until the sockets are + closed */ + (* smbw_libc.close)(p[1]); + (* smbw_libc.read)(p[0], &c, 1); + (* smbw_libc.close)(p[0]); + return child_pid; + } + + (* smbw_libc.close)(p[0]); + + /* close all server connections and locally-opened files */ + for (i = 0; i < __FD_SETSIZE; i++) { + if (smbw_fd_map[i] > 0 && + smbw_ref(smbw_fd_map[i], SMBW_RCT_Get) > 0) { + + smbc_close(smbw_fd_map[i]); + smbw_ref(smbw_fd_map[i], SMBW_RCT_Set, 0); + (* smbw_libc.close)(i); + } + + smbw_fd_map[i] = -1; + } + + /* unblock the parent */ + write(p[1], &c, 1); + (* smbw_libc.close)(p[1]); + + /* specify directory to start in, if it's simulated smb */ + if (*smbw_cwd != '\0') { + setenv("SMBW_DIR", smbw_cwd, 1); + } else { + unsetenv("SMBW_DIR"); + } + + /* Re-initialize this library for the child */ + do_init(StartupType_Fake); + + /* and continue in the child */ + return 0; +} + +int smbw_setxattr(const char *fname, + const char *name, + const void *value, + size_t size, + int flags) +{ + char path[PATH_MAX]; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + smbw_fix_path(fname, path); + return smbc_setxattr(path, name, value, size, flags); +} + +int smbw_lsetxattr(const char *fname, + const char *name, + const void *value, + size_t size, + int flags) +{ + char path[PATH_MAX]; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + smbw_fix_path(fname, path); + return smbc_lsetxattr(path, name, value, size, flags); +} + +int smbw_fsetxattr(int smbw_fd, + const char *name, + const void *value, + size_t size, + int flags) +{ + int client_fd; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + client_fd = smbw_fd_map[smbw_fd]; + return smbc_fsetxattr(client_fd, name, value, size, flags); +} + +int smbw_getxattr(const char *fname, + const char *name, + const void *value, + size_t size) +{ + char path[PATH_MAX]; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + smbw_fix_path(fname, path); + + return smbc_getxattr(path, name, value, size); +} + +int smbw_lgetxattr(const char *fname, + const char *name, + const void *value, + size_t size) +{ + char path[PATH_MAX]; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + smbw_fix_path(fname, path); + return smbc_lgetxattr(path, name, value, size); +} + +int smbw_fgetxattr(int smbw_fd, + const char *name, + const void *value, + size_t size) +{ + int client_fd; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + client_fd = smbw_fd_map[smbw_fd]; + return smbc_fgetxattr(client_fd, name, value, size); +} + +int smbw_removexattr(const char *fname, + const char *name) +{ + char path[PATH_MAX]; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + smbw_fix_path(fname, path); + return smbc_removexattr(path, name); +} + +int smbw_lremovexattr(const char *fname, + const char *name) +{ + char path[PATH_MAX]; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + smbw_fix_path(fname, path); + return smbc_lremovexattr(path, name); +} + +int smbw_fremovexattr(int smbw_fd, + const char *name) +{ + int client_fd; + + if (strcmp(name, "system.posix_acl_access") == 0) + { + name = "system.*"; + } + + client_fd = smbw_fd_map[smbw_fd]; + return smbc_fremovexattr(client_fd, name); +} + +int smbw_listxattr(const char *fname, + char *list, + size_t size) +{ + char path[PATH_MAX]; + + smbw_fix_path(fname, path); + return smbc_listxattr(path, list, size); +} + +int smbw_llistxattr(const char *fname, + char *list, + size_t size) +{ + char path[PATH_MAX]; + + smbw_fix_path(fname, path); + return smbc_llistxattr(path, list, size); +} + +int smbw_flistxattr(int smbw_fd, + char *list, + size_t size) +{ + int client_fd; + + client_fd = smbw_fd_map[smbw_fd]; + return smbc_flistxattr(client_fd, list, size); +} |