diff options
Diffstat (limited to 'lib/libshare/smb.c')
| -rw-r--r-- | lib/libshare/smb.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/lib/libshare/smb.c b/lib/libshare/smb.c new file mode 100644 index 000000000..e34d14259 --- /dev/null +++ b/lib/libshare/smb.c @@ -0,0 +1,437 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2011,2012 Turbo Fredriksson <[email protected]>, based on nfs.c + * by Gunnar Beutner + * + * This is an addition to the zfs device driver to add, modify and remove SMB + * shares using the 'net share' command that comes with Samba. + + * TESTING + * Make sure that samba listens to 'localhost' (127.0.0.1) and that the options + * 'usershare max shares' and 'usershare owner only' have been rewied/set + * accordingly (see zfs(8) for information). + * + * Once configuration in samba have been done, test that this + * works with the following three commands (in this case, my ZFS + * filesystem is called 'share/Test1'): + * + * (root)# net -U root -S 127.0.0.1 usershare add Test1 /share/Test1 \ + * "Comment: /share/Test1" "Everyone:F" + * (root)# net usershare list | grep -i test + * (root)# net -U root -S 127.0.0.1 usershare delete Test1 + * + * The first command will create a user share that gives everyone full access. + * To limit the access below that, use normal UNIX commands (chmod, chown etc). + */ + +#include <time.h> +#include <stdlib.h> +#include <stdio.h> +#include <strings.h> +#include <fcntl.h> +#include <sys/wait.h> +#include <unistd.h> +#include <dirent.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <libzfs.h> +#include <libshare.h> +#include "libshare_impl.h" +#include "smb.h" + +static boolean_t smb_available(void); + +static sa_fstype_t *smb_fstype; + +/** + * Retrieve the list of SMB shares. + */ +static int +smb_retrieve_shares(void) +{ + int rc = SA_OK; + char file_path[PATH_MAX], line[512], *token, *key, *value; + char *dup_value, *path = NULL, *comment = NULL, *name = NULL; + char *guest_ok = NULL; + DIR *shares_dir; + FILE *share_file_fp = NULL; + struct dirent *directory; + struct stat eStat; + smb_share_t *shares, *new_shares = NULL; + + /* opendir(), stat() */ + shares_dir = opendir(SHARE_DIR); + if (shares_dir == NULL) + return SA_SYSTEM_ERR; + + /* Go through the directory, looking for shares */ + while ((directory = readdir(shares_dir))) { + if (directory->d_name[0] == '.') + continue; + + snprintf(file_path, sizeof (file_path), + "%s/%s", SHARE_DIR, directory->d_name); + + if (stat(file_path, &eStat) == -1) { + rc = SA_SYSTEM_ERR; + goto out; + } + + if (!S_ISREG(eStat.st_mode)) + continue; + + if ((share_file_fp = fopen(file_path, "r")) == NULL) { + rc = SA_SYSTEM_ERR; + goto out; + } + + name = strdup(directory->d_name); + if (name == NULL) { + rc = SA_NO_MEMORY; + goto out; + } + + while (fgets(line, sizeof(line), share_file_fp)) { + if (line[0] == '#') + continue; + + /* Trim trailing new-line character(s). */ + while (line[strlen(line) - 1] == '\r' || + line[strlen(line) - 1] == '\n') + line[strlen(line) - 1] = '\0'; + + /* Split the line in two, separated by '=' */ + token = strchr(line, '='); + if (token == NULL) + continue; + + key = line; + value = token + 1; + *token = '\0'; + + dup_value = strdup(value); + if (dup_value == NULL) { + rc = SA_NO_MEMORY; + goto out; + } + + if (strcmp(key, "path") == 0) + path = dup_value; + if (strcmp(key, "comment") == 0) + comment = dup_value; + if (strcmp(key, "guest_ok") == 0) + guest_ok = dup_value; + + if (path == NULL || comment == NULL || guest_ok == NULL) + continue; /* Incomplete share definition */ + else { + shares = (smb_share_t *) + malloc(sizeof (smb_share_t)); + if (shares == NULL) { + rc = SA_NO_MEMORY; + goto out; + } + + strncpy(shares->name, name, + sizeof (shares->name)); + shares->name [sizeof(shares->name)-1] = '\0'; + + strncpy(shares->path, path, + sizeof (shares->path)); + shares->path [sizeof(shares->path)-1] = '\0'; + + strncpy(shares->comment, comment, + sizeof (shares->comment)); + shares->comment[sizeof(shares->comment)-1]='\0'; + + shares->guest_ok = atoi(guest_ok); + + shares->next = new_shares; + new_shares = shares; + + name = NULL; + path = NULL; + comment = NULL; + guest_ok = NULL; + } + } + +out: + if (share_file_fp != NULL) + fclose(share_file_fp); + + free(name); + free(path); + free(comment); + free(guest_ok); + } + closedir(shares_dir); + + smb_shares = new_shares; + + return rc; +} + +/** + * Used internally by smb_enable_share to enable sharing for a single host. + */ +static int +smb_enable_share_one(const char *sharename, const char *sharepath) +{ + char *argv[10], *pos; + char name[SMB_NAME_MAX], comment[SMB_COMMENT_MAX]; + int rc; + + /* Support ZFS share name regexp '[[:alnum:]_-.: ]' */ + strncpy(name, sharename, sizeof(name)); + name [sizeof(name)-1] = '\0'; + + pos = name; + while (*pos != '\0') { + switch (*pos) { + case '/': + case '-': + case ':': + case ' ': + *pos = '_'; + } + + ++pos; + } + + /* CMD: net -S NET_CMD_ARG_HOST usershare add Test1 /share/Test1 \ + * "Comment" "Everyone:F" */ + snprintf(comment, sizeof(comment), "Comment: %s", sharepath); + + argv[0] = NET_CMD_PATH; + argv[1] = (char*)"-S"; + argv[2] = NET_CMD_ARG_HOST; + argv[3] = (char*)"usershare"; + argv[4] = (char*)"add"; + argv[5] = (char*)name; + argv[6] = (char*)sharepath; + argv[7] = (char*)comment; + argv[8] = "Everyone:F"; + argv[9] = NULL; + + rc = libzfs_run_process(argv[0], argv, 0); + if (rc < 0) + return SA_SYSTEM_ERR; + + /* Reload the share file */ + (void) smb_retrieve_shares(); + + return SA_OK; +} + +/** + * Enables SMB sharing for the specified share. + */ +static int +smb_enable_share(sa_share_impl_t impl_share) +{ + char *shareopts; + + if (!smb_available()) + return SA_SYSTEM_ERR; + + shareopts = FSINFO(impl_share, smb_fstype)->shareopts; + if (shareopts == NULL) /* on/off */ + return SA_SYSTEM_ERR; + + if (strcmp(shareopts, "off") == 0) + return SA_OK; + + /* Magic: Enable (i.e., 'create new') share */ + return smb_enable_share_one(impl_share->dataset, impl_share->sharepath); +} + +/** + * Used internally by smb_disable_share to disable sharing for a single host. + */ +static int +smb_disable_share_one(const char *sharename) +{ + int rc; + char *argv[7]; + + /* CMD: net -S NET_CMD_ARG_HOST usershare delete Test1 */ + argv[0] = NET_CMD_PATH; + argv[1] = (char*)"-S"; + argv[2] = NET_CMD_ARG_HOST; + argv[3] = (char*)"usershare"; + argv[4] = (char*)"delete"; + argv[5] = strdup(sharename); + argv[6] = NULL; + + rc = libzfs_run_process(argv[0], argv, 0); + if (rc < 0) + return SA_SYSTEM_ERR; + else + return SA_OK; +} + +/** + * Disables SMB sharing for the specified share. + */ +static int +smb_disable_share(sa_share_impl_t impl_share) +{ + smb_share_t *shares = smb_shares; + + if (!smb_available()) { + /* + * The share can't possibly be active, so nothing + * needs to be done to disable it. + */ + return SA_OK; + } + + while (shares != NULL) { + if (strcmp(impl_share->sharepath, shares->path) == 0) + return smb_disable_share_one(shares->name); + + shares = shares->next; + } + + return SA_OK; +} + +/** + * Checks whether the specified SMB share options are syntactically correct. + */ +static int +smb_validate_shareopts(const char *shareopts) +{ + /* TODO: Accept 'name' and sec/acl (?) */ + if ((strcmp(shareopts, "off") == 0) || (strcmp(shareopts, "on") == 0)) + return SA_OK; + + return SA_SYNTAX_ERR; +} + +/** + * Checks whether a share is currently active. + */ +static boolean_t +smb_is_share_active(sa_share_impl_t impl_share) +{ + if (!smb_available()) + return B_FALSE; + + /* Retrieve the list of (possible) active shares */ + smb_retrieve_shares(); + + while (smb_shares != NULL) { + if (strcmp(impl_share->sharepath, smb_shares->path) == 0) + return B_TRUE; + + smb_shares = smb_shares->next; + } + + return B_FALSE; +} + +/** + * Called to update a share's options. A share's options might be out of + * date if the share was loaded from disk and the "sharesmb" dataset + * property has changed in the meantime. This function also takes care + * of re-enabling the share if necessary. + */ +static int +smb_update_shareopts(sa_share_impl_t impl_share, const char *resource, + const char *shareopts) +{ + char *shareopts_dup; + boolean_t needs_reshare = B_FALSE; + char *old_shareopts; + + if(!impl_share) + return SA_SYSTEM_ERR; + + FSINFO(impl_share, smb_fstype)->active = + smb_is_share_active(impl_share); + + old_shareopts = FSINFO(impl_share, smb_fstype)->shareopts; + + if (FSINFO(impl_share, smb_fstype)->active && old_shareopts != NULL && + strcmp(old_shareopts, shareopts) != 0) { + needs_reshare = B_TRUE; + smb_disable_share(impl_share); + } + + shareopts_dup = strdup(shareopts); + + if (shareopts_dup == NULL) + return SA_NO_MEMORY; + + if (old_shareopts != NULL) + free(old_shareopts); + + FSINFO(impl_share, smb_fstype)->shareopts = shareopts_dup; + + if (needs_reshare) + smb_enable_share(impl_share); + + return SA_OK; +} + +/** + * Clears a share's SMB options. Used by libshare to + * clean up shares that are about to be free()'d. + */ +static void +smb_clear_shareopts(sa_share_impl_t impl_share) +{ + free(FSINFO(impl_share, smb_fstype)->shareopts); + FSINFO(impl_share, smb_fstype)->shareopts = NULL; +} + +static const sa_share_ops_t smb_shareops = { + .enable_share = smb_enable_share, + .disable_share = smb_disable_share, + + .validate_shareopts = smb_validate_shareopts, + .update_shareopts = smb_update_shareopts, + .clear_shareopts = smb_clear_shareopts, +}; + +/* + * Provides a convenient wrapper for determining SMB availability + */ +static boolean_t +smb_available(void) +{ + /* TODO: Sanity check NET_CMD_PATH and SHARE_DIR */ + return B_TRUE; +} + +/** + * Initializes the SMB functionality of libshare. + */ +void +libshare_smb_init(void) +{ + smb_fstype = register_fstype("smb", &smb_shareops); +} |