| /*------------------------------------------------------------- |
| |
| The namei program |
| |
| By: Roger S. Southwick |
| |
| May 2, 1990 |
| |
| |
| Modifications by Steve Tell March 28, 1991 |
| |
| usage: namei pathname [pathname ... ] |
| |
| This program reads it's arguments as pathnames to any type |
| of Unix file (symlinks, files, directories, and so forth). |
| The program then follows each pathname until a terminal |
| point is found (a file, directory, char device, etc). |
| If it finds a symbolic link, we show the link, and start |
| following it, indenting the output to show the context. |
| |
| This program is useful for finding a "too many levels of |
| symbolic links" problems. |
| |
| For each line output, the program puts a file type first: |
| |
| f: = the pathname we are currently trying to resolve |
| d = directory |
| D = directory that is a mount point |
| l = symbolic link (both the link and it's contents are output) |
| s = socket |
| b = block device |
| c = character device |
| - = regular file |
| ? = an error of some kind |
| |
| The program prints an informative messages when we exceed |
| the maximum number of symbolic links this system can have. |
| |
| The program exits with a 1 status ONLY if it finds it cannot |
| chdir to /, or if it encounters an unknown file type. |
| |
| 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org> |
| - added Native Language Support |
| |
| -------------------------------------------------------------*/ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/param.h> |
| #include "nls.h" |
| |
| #define ERR strerror(errno),errno |
| |
| int symcount; |
| int mflag = 0; |
| int xflag = 0; |
| |
| #ifndef MAXSYMLINKS |
| #define MAXSYMLINKS 256 |
| #endif |
| |
| static char *pperm(unsigned short); |
| static void namei(char *, int); |
| static void usage(void); |
| |
| int |
| main(int argc, char **argv) { |
| extern int optind; |
| int c; |
| char curdir[MAXPATHLEN]; |
| |
| setlocale(LC_ALL, ""); |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| |
| if(argc < 2) |
| usage(); |
| |
| while((c = getopt(argc, argv, "mx")) != EOF){ |
| switch(c){ |
| case 'm': |
| mflag = !mflag; |
| break; |
| |
| case 'x': |
| xflag = !xflag; |
| break; |
| |
| case '?': |
| default: |
| usage(); |
| } |
| } |
| |
| if(getcwd(curdir, sizeof(curdir)) == NULL){ |
| (void)fprintf(stderr, _("namei: unable to get current directory - %s\n"), curdir); |
| exit(1); |
| } |
| |
| |
| for(; optind < argc; optind++){ |
| (void)printf("f: %s\n", argv[optind]); |
| symcount = 1; |
| namei(argv[optind], 0); |
| |
| if(chdir(curdir) == -1){ |
| (void)fprintf(stderr, _("namei: unable to chdir to %s - %s (%d)\n"), curdir, ERR); |
| exit(1); |
| } |
| } |
| return 0; |
| } |
| |
| static void |
| usage(void) { |
| (void)fprintf(stderr,_("usage: namei [-mx] pathname [pathname ...]\n")); |
| exit(1); |
| } |
| |
| #ifndef NODEV |
| #define NODEV (dev_t)(-1) |
| #endif |
| |
| static void |
| namei(char *file, int lev) { |
| char *cp; |
| char buf[BUFSIZ], sym[BUFSIZ]; |
| struct stat stb; |
| int i; |
| dev_t lastdev = NODEV; |
| |
| /* |
| * See if the file has a leading /, and if so cd to root |
| */ |
| |
| if(*file == '/'){ |
| while(*file == '/') |
| file++; |
| |
| if(chdir("/") == -1){ |
| (void)fprintf(stderr,_("namei: could not chdir to root!\n")); |
| exit(1); |
| } |
| for(i = 0; i < lev; i++) |
| (void)printf(" "); |
| |
| if(stat("/", &stb) == -1){ |
| (void)fprintf(stderr, _("namei: could not stat root!\n")); |
| exit(1); |
| } |
| lastdev = stb.st_dev; |
| |
| if(mflag) |
| (void)printf(" d%s /\n", pperm(stb.st_mode)); |
| else |
| (void)printf(" d /\n"); |
| } |
| |
| for(;;){ |
| |
| /* |
| * Copy up to the next / (or nil) into buf |
| */ |
| |
| for(cp = buf; *file != '\0' && *file != '/'; cp++, file++) |
| *cp = *file; |
| |
| while(*file == '/') /* eat extra /'s */ |
| file++; |
| |
| *cp = '\0'; |
| |
| if(buf[0] == '\0'){ |
| |
| /* |
| * Buf is empty, so therefore we are done |
| * with this level of file |
| */ |
| |
| return; |
| } |
| |
| for(i = 0; i < lev; i++) |
| (void)printf(" "); |
| |
| /* |
| * See what type of critter this file is |
| */ |
| |
| if(lstat(buf, &stb) == -1){ |
| (void)printf(" ? %s - %s (%d)\n", buf, ERR); |
| return; |
| } |
| |
| switch(stb.st_mode & S_IFMT){ |
| case S_IFDIR: |
| |
| /* |
| * File is a directory, chdir to it |
| */ |
| |
| if(chdir(buf) == -1){ |
| (void)printf(_(" ? could not chdir into %s - %s (%d)\n"), buf, ERR ); |
| return; |
| } |
| if(xflag && lastdev != stb.st_dev && lastdev != NODEV){ |
| /* Across mnt point */ |
| if(mflag) |
| (void)printf(" D%s %s\n", pperm(stb.st_mode), buf); |
| else |
| (void)printf(" D %s\n", buf); |
| } |
| else { |
| if(mflag) |
| (void)printf(" d%s %s\n", pperm(stb.st_mode), buf); |
| else |
| (void)printf(" d %s\n", buf); |
| } |
| lastdev = stb.st_dev; |
| |
| (void)fflush(stdout); |
| break; |
| |
| case S_IFLNK: |
| /* |
| * Sigh, another symlink. Read it's contents and |
| * call namei() |
| */ |
| |
| bzero(sym, BUFSIZ); |
| if(readlink(buf, sym, BUFSIZ) == -1){ |
| (void)printf(_(" ? problems reading symlink %s - %s (%d)\n"), buf, ERR); |
| return; |
| } |
| |
| if(mflag) |
| (void)printf(" l%s %s -> %s", pperm(stb.st_mode), buf, sym); |
| else |
| (void)printf(" l %s -> %s", buf, sym); |
| |
| if(symcount > 0 && symcount++ > MAXSYMLINKS){ |
| (void)printf(_(" *** EXCEEDED UNIX LIMIT OF SYMLINKS ***\n")); |
| symcount = -1; |
| } else { |
| (void)printf("\n"); |
| namei(sym, lev + 1); |
| } |
| break; |
| |
| case S_IFCHR: |
| if(mflag) |
| (void)printf(" c%s %s\n", pperm(stb.st_mode), buf); |
| else |
| (void)printf(" c %s\n", buf); |
| break; |
| |
| case S_IFBLK: |
| if(mflag) |
| (void)printf(" b%s %s\n", pperm(stb.st_mode), buf); |
| else |
| (void)printf(" b %s\n", buf); |
| break; |
| |
| case S_IFSOCK: |
| if(mflag) |
| (void)printf(" s%s %s\n", pperm(stb.st_mode), buf); |
| else |
| (void)printf(" s %s\n", buf); |
| break; |
| |
| case S_IFREG: |
| if(mflag) |
| (void)printf(" -%s %s\n", pperm(stb.st_mode), buf); |
| else |
| (void)printf(" - %s\n", buf); |
| break; |
| |
| default: |
| (void)fprintf(stderr,_("namei: unknown file type 0%06o on file %s\n"), stb.st_mode, buf ); |
| exit(1); |
| |
| } |
| } |
| } |
| |
| /* Take a |
| * Mode word, as from a struct stat, and return |
| * a pointer to a static string containing a printable version like ls. |
| * For example 0755 produces "rwxr-xr-x" |
| */ |
| static char * |
| pperm(unsigned short mode) { |
| unsigned short m; |
| static char buf[16]; |
| char *bp; |
| char *lschars = "xwrxwrxwr"; /* the complete string backwards */ |
| char *cp; |
| int i; |
| |
| for(i = 0, cp = lschars, m = mode, bp = &buf[8]; |
| i < 9; |
| i++, cp++, m >>= 1, bp--) { |
| |
| if(m & 1) |
| *bp = *cp; |
| else |
| *bp = '-'; |
| } |
| buf[9] = '\0'; |
| |
| if(mode & S_ISUID) { |
| if(buf[2] == 'x') |
| buf[2] = 's'; |
| else |
| buf[2] = 'S'; |
| } |
| if(mode & S_ISGID) { |
| if(buf[5] == 'x') |
| buf[5] = 's'; |
| else |
| buf[5] = 'S'; |
| } |
| if(mode & S_ISVTX) { |
| if(buf[8] == 'x') |
| buf[8] = 't'; |
| else |
| buf[8] = 'T'; |
| } |
| |
| return &buf[0]; |
| } |
| |
| |