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Diffstat (limited to 'src/checkpath.c')
| -rw-r--r-- | src/checkpath.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/src/checkpath.c b/src/checkpath.c new file mode 100644 index 0000000..9c1fba6 --- /dev/null +++ b/src/checkpath.c @@ -0,0 +1,233 @@ +/* + checkpath.c + Checks for the existance of a file or directory and creates it + if necessary. It can also correct its ownership. + */ + +/* + * Copyright 2007 Roy Marples + * All rights reserved + + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <grp.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "builtins.h" +#include "einfo.h" +#include "rc-misc.h" + +static const char *applet; + +static int do_check (char *path, uid_t uid, gid_t gid, mode_t mode, int file) +{ + struct stat st; + + memset (&st, 0, sizeof (struct stat)); + + if (stat (path, &st)) { + if (file) { + int fd; + einfo ("%s: creating file", path); + if ((fd = open (path, O_CREAT)) == -1) { + eerror ("%s: open: %s", applet, strerror (errno)); + return (-1); + } + close (fd); + } else { + einfo ("%s: creating directory", path); + if (! mode) + mode = S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH; + if (mkdir (path, mode)) { + eerror ("%s: mkdir: %s", applet, strerror (errno)); + return (-1); + } + mode = 0; + } + } else { + if ((file && S_ISDIR (st.st_mode)) || + (! file && ! S_ISDIR (st.st_mode))) + { + if (file) + eerror ("%s: is a directory", path); + else + eerror ("%s: is a file", path); + return (-1); + } + } + + if (mode && (st.st_mode & 0777) != mode) { + einfo ("%s: correcting mode", applet); + if (chmod (path, mode)) { + eerror ("%s: chmod: %s", applet, strerror (errno)); + return (-1); + } + } + + if (st.st_uid != uid || st.st_gid != gid) { + if (st.st_dev || st.st_ino) + einfo ("%s: correcting owner", path); + if (chown (path, uid, gid)) { + eerror ("%s: chown: %s", applet, strerror (errno)); + return (-1); + } + } + + return (0); +} + +/* Based on busybox */ +static int parse_mode (mode_t *mode, char *text) +{ + /* Check for a numeric mode */ + if ((*mode - '0') < 8) { + char *p; + unsigned long l = strtoul (text, &p, 8); + if (*p || l > 07777U) { + errno = EINVAL; + return (-1); + } + *mode = l; + return (0); + } + + /* We currently don't check g+w type stuff */ + errno = EINVAL; + return (-1); +} + +static int parse_owner (struct passwd **user, struct group **group, + const char *owner) +{ + char *u = xstrdup (owner); + char *g = strchr (u, ':'); + int id = 0; + int retval = 0; + + if (g) + *g++ = '\0'; + + if (user && *u) { + if (sscanf (u, "%d", &id) == 1) + *user = getpwuid (id); + else + *user = getpwnam (u); + if (! *user) + retval = -1; + } + + if (group && g && *g) { + if (sscanf (g, "%d", &id) == 1) + *group = getgrgid (id); + else + *group = getgrnam (g); + if (! *group) + retval = -1; + } + + free (u); + return (retval); +} + +#include "_usage.h" +#define extraopts "dir1 dir2 ..." +#define getoptstring "fm:o:" getoptstring_COMMON +static struct option longopts[] = { + { "directory", 0, NULL, 'd'}, + { "file", 0, NULL, 'f'}, + { "mode", 1, NULL, 'm'}, + { "owner", 1, NULL, 'o'}, + longopts_COMMON +}; +static const char * const longopts_help[] = { + "Check if a directory", + "Check if a file", + "Mode to check", + "Owner to check (user:group)", + longopts_help_COMMON +}; +#include "_usage.c" + +int checkpath (int argc, char **argv) +{ + int opt; + uid_t uid = geteuid(); + gid_t gid = getgid(); + mode_t mode = 0; + struct passwd *pw = NULL; + struct group *gr = NULL; + bool file = 0; + + applet = basename_c (argv[0]); + int retval = EXIT_SUCCESS; + + while ((opt = getopt_long (argc, argv, getoptstring, + longopts, (int *) 0)) != -1) + { + switch (opt) { + case 'd': + file = 0; + break; + case 'f': + file = 1; + break; + case 'm': + if (parse_mode (&mode, optarg) != 0) + eerrorx ("%s: invalid mode `%s'", applet, optarg); + break; + case 'o': + if (parse_owner (&pw, &gr, optarg) != 0) + eerrorx ("%s: owner `%s' not found", applet, optarg); + break; + + case_RC_COMMON_GETOPT + } + } + + if (optind >= argc) + usage (EXIT_FAILURE); + + if (pw) { + uid = pw->pw_uid; + gid = pw->pw_gid; + } + if (gr) + gid = gr->gr_gid; + + while (optind < argc) { + if (do_check (argv[optind], uid, gid, mode, file)) + retval = EXIT_FAILURE; + optind++; + } + + exit (retval); +} |