61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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int main(int argc, char** argv)
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{
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if (argc != 3)
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{
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fprintf(stderr, "usage: %s MOUNT_POINT PERMS_FILE\n", argv[0]);
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return 1;
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}
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int mount_fd = open(argv[1], O_RDONLY | O_DIRECTORY);
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if (mount_fd == -1)
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{
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fprintf(stderr, "could not open %s: %s\n", argv[1], strerror(errno));
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return 1;
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}
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FILE* perm_fp = fopen(argv[2], "r");
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if (perm_fp == NULL)
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{
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fprintf(stderr, "could not open %s: %s\n", argv[2], strerror(errno));
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return 1;
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}
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char buffer[1024];
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while (fgets(buffer, sizeof(buffer), perm_fp))
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{
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char path[PATH_MAX];
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uid_t uid;
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gid_t gid;
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mode_t mode;
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if (sscanf(buffer, "%[^|\n]|%d|%d|%o\n", path, &uid, &gid, &mode) != 4)
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continue;
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struct stat st;
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if (fstatat(mount_fd, path, &st, AT_SYMLINK_NOFOLLOW) != 0)
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continue;
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if (st.st_uid != uid || st.st_gid != gid)
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if (fchownat(mount_fd, path, uid, gid, AT_SYMLINK_NOFOLLOW) != 0)
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fprintf(stderr, "fchownat: %s: %s\n", path, strerror(errno));
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const mode_t mode_mask = S_ISUID | S_ISGID | S_ISVTX | 0777;
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if (mode != (st.st_mode & mode_mask))
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if (fchmodat(mount_fd, path, mode, AT_SYMLINK_NOFOLLOW) != 0)
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fprintf(stderr, "fchmodat: %s: %s\n", path, strerror(errno));
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}
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fclose(perm_fp);
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close(mount_fd);
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return 0;
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}
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