pathchk.c (2341B)
1 /* See LICENSE file for copyright and license details. */ 2 #include <sys/stat.h> 3 4 #include <errno.h> 5 #include <limits.h> 6 #include <stdint.h> 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <string.h> 10 11 #include "util.h" 12 13 #define PORTABLE_CHARACTER_SET "0123456789._-qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM" 14 /* If your system supports more other characters, but not all non-NUL characters, define SYSTEM_CHARACTER_SET. */ 15 16 static int most = 0; 17 static int extra = 0; 18 19 static int 20 pathchk(char *filename) 21 { 22 char *invalid, *invalid_end, *p, *q; 23 const char *character_set; 24 size_t len, maxlen; 25 struct stat st; 26 27 /* Empty? */ 28 if (extra && !*filename) 29 eprintf("empty filename\n"); 30 31 /* Leading hyphen? */ 32 if (extra && ((*filename == '-') || strstr(filename, "/-"))) 33 eprintf("%s: leading '-' in component of filename\n", filename); 34 35 /* Nonportable character? */ 36 #ifdef SYSTEM_CHARACTER_SET 37 character_set = "/"SYSTEM_CHARACTER_SET; 38 #else 39 character_set = 0; 40 #endif 41 if (most) 42 character_set = "/"PORTABLE_CHARACTER_SET; 43 if (character_set && *(invalid = filename + strspn(filename, character_set))) { 44 for (invalid_end = invalid + 1; *invalid_end & 0x80; invalid_end++); 45 p = estrdup(filename); 46 *invalid_end = 0; 47 eprintf("%s: nonportable character '%s'\n", p, invalid); 48 } 49 50 /* Symlink error? Non-searchable directory? */ 51 if (lstat(filename, &st) && errno != ENOENT) { 52 /* lstat rather than stat, so that if filename is a bad symlink, but 53 * all parents are OK, no error will be detected. */ 54 eprintf("%s:", filename); 55 } 56 57 /* Too long pathname? */ 58 maxlen = most ? _POSIX_PATH_MAX : PATH_MAX; 59 if (strlen(filename) >= maxlen) 60 eprintf("%s: is longer than %zu bytes\n", filename, maxlen); 61 62 /* Too long component? */ 63 maxlen = most ? _POSIX_NAME_MAX : NAME_MAX; 64 for (p = filename; p; p = q) { 65 q = strchr(p, '/'); 66 len = q ? (size_t)(q++ - p) : strlen(p); 67 if (len > maxlen) 68 eprintf("%s: includes component longer than %zu bytes\n", 69 filename, maxlen); 70 } 71 72 return 0; 73 } 74 75 static void 76 usage(void) 77 { 78 eprintf("usage: %s [-pP] filename...\n", argv0); 79 } 80 81 int 82 main(int argc, char *argv[]) 83 { 84 int ret = 0; 85 86 ARGBEGIN { 87 case 'p': 88 most = 1; 89 break; 90 case 'P': 91 extra = 1; 92 break; 93 default: 94 usage(); 95 } ARGEND 96 97 if (!argc) 98 usage(); 99 100 for (; argc--; argv++) 101 ret |= pathchk(*argv); 102 103 return ret; 104 }