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Diffstat (limited to '')
| -rw-r--r-- | debugfs/util.c | 600 |
1 files changed, 600 insertions, 0 deletions
diff --git a/debugfs/util.c b/debugfs/util.c new file mode 100644 index 0000000..9e88054 --- /dev/null +++ b/debugfs/util.c @@ -0,0 +1,600 @@ +/* + * util.c --- utilities for the debugfs program + * + * Copyright (C) 1993, 1994 Theodore Ts'o. This file may be + * redistributed under the terms of the GNU Public License. + * + */ + +#define _XOPEN_SOURCE 600 /* needed for strptime */ + +#include "config.h" +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <ctype.h> +#include <string.h> +#include <time.h> +#include <signal.h> +#ifdef HAVE_GETOPT_H +#include <getopt.h> +#else +extern int optind; +extern char *optarg; +#endif +#ifdef HAVE_OPTRESET +extern int optreset; /* defined by BSD, but not others */ +#endif + +#include "ss/ss.h" +#include "debugfs.h" + +/* + * This function resets the libc getopt() function, which keeps + * internal state. Bad design! Stupid libc API designers! No + * biscuit! + * + * BSD-derived getopt() functions require that optind be reset to 1 in + * order to reset getopt() state. This used to be generally accepted + * way of resetting getopt(). However, glibc's getopt() + * has additional getopt() state beyond optind, and requires that + * optind be set zero to reset its state. So the unfortunate state of + * affairs is that BSD-derived versions of getopt() misbehave if + * optind is set to 0 in order to reset getopt(), and glibc's getopt() + * will core dump if optind is set 1 in order to reset getopt(). + * + * More modern versions of BSD require that optreset be set to 1 in + * order to reset getopt(). Sigh. Standards, anyone? + * + * We hide the hair here. + */ +void reset_getopt(void) +{ +#if defined(__GLIBC__) || defined(__linux__) + optind = 0; +#else + optind = 1; +#endif +#ifdef HAVE_OPTRESET + optreset = 1; /* Makes BSD getopt happy */ +#endif +} + +static const char *pager_search_list[] = { "pager", "more", "less", 0 }; +static const char *pager_dir_list[] = { "/usr/bin", "/bin", 0 }; + +static const char *find_pager(char *buf) +{ + const char **i, **j; + + for (i = pager_search_list; *i; i++) { + for (j = pager_dir_list; *j; j++) { + sprintf(buf, "%s/%s", *j, *i); + if (access(buf, X_OK) == 0) + return(buf); + } + } + return 0; +} + +FILE *open_pager(void) +{ + FILE *outfile = 0; + const char *pager = ss_safe_getenv("DEBUGFS_PAGER"); + char buf[80]; + + signal(SIGPIPE, SIG_IGN); + if (!isatty(1)) + return stdout; + if (!pager) + pager = ss_safe_getenv("PAGER"); + if (!pager) + pager = find_pager(buf); + if (!pager || + (strcmp(pager, "__none__") == 0) || + ((outfile = popen(pager, "w")) == 0)) + return stdout; + return outfile; +} + +void close_pager(FILE *stream) +{ + if (stream && stream != stdout) pclose(stream); +} + +/* + * This routine is used whenever a command needs to turn a string into + * an inode. + */ +ext2_ino_t string_to_inode(char *str) +{ + ext2_ino_t ino; + int len = strlen(str); + char *end; + int retval; + + /* + * If the string is of the form <ino>, then treat it as an + * inode number. + */ + if ((len > 2) && (str[0] == '<') && (str[len-1] == '>')) { + ino = strtoul(str+1, &end, 0); + if (*end=='>' && (ino <= current_fs->super->s_inodes_count)) + return ino; + } + + retval = ext2fs_namei(current_fs, root, cwd, str, &ino); + if (retval) { + com_err(str, retval, 0); + return 0; + } + if (ino > current_fs->super->s_inodes_count) { + com_err(str, 0, "resolves to an illegal inode number: %u\n", + ino); + return 0; + } + return ino; +} + +/* + * This routine returns 1 if the filesystem is not open, and prints an + * error message to that effect. + */ +int check_fs_open(char *name) +{ + if (!current_fs) { + com_err(name, 0, "Filesystem not open"); + return 1; + } + return 0; +} + +/* + * This routine returns 1 if a filesystem is open, and prints an + * error message to that effect. + */ +int check_fs_not_open(char *name) +{ + if (current_fs) { + com_err(name, 0, + "Filesystem %s is still open. Close it first.\n", + current_fs->device_name); + return 1; + } + return 0; +} + +/* + * This routine returns 1 if a filesystem is not opened read/write, + * and prints an error message to that effect. + */ +int check_fs_read_write(char *name) +{ + if (!(current_fs->flags & EXT2_FLAG_RW)) { + com_err(name, 0, "Filesystem opened read/only"); + return 1; + } + return 0; +} + +/* + * This routine returns 1 if a filesystem is doesn't have its inode + * and block bitmaps loaded, and prints an error message to that + * effect. + */ +int check_fs_bitmaps(char *name) +{ + if (!current_fs->block_map || !current_fs->inode_map) { + com_err(name, 0, "Filesystem bitmaps not loaded"); + return 1; + } + return 0; +} + +char *inode_time_to_string(__u32 xtime, __u32 xtime_extra) +{ + __s64 t = (__s32) xtime; + + t += (__s64) (xtime_extra & EXT4_EPOCH_MASK) << 32; + return time_to_string(t); +} + +/* + * This function takes a __s64 time value and converts it to a string, + * using ctime + */ +char *time_to_string(__s64 cl) +{ + static int do_gmt = -1; + time_t t = (time_t) cl; + const char *tz; + + if (do_gmt == -1) { + /* The diet libc doesn't respect the TZ environment variable */ + tz = ss_safe_getenv("TZ"); + if (!tz) + tz = ""; + do_gmt = !strcmp(tz, "GMT") || !strcmp(tz, "GMT0"); + } + + return asctime((do_gmt) ? gmtime(&t) : localtime(&t)); +} + +/* + * Parse a string as a time. Return ((time_t)-1) if the string + * doesn't appear to be a sane time. + */ +extern __s64 string_to_time(const char *arg) +{ + struct tm ts; + __s64 ret; + char *tmp; + + if (strcmp(arg, "now") == 0) { + return time(0); + } + if (arg[0] == '@') { + /* interpret it as an integer */ + arg++; + fallback: + ret = strtoll(arg, &tmp, 0); + if (*tmp) + return -1; + return ret; + } + memset(&ts, 0, sizeof(ts)); +#ifdef HAVE_STRPTIME + tmp = strptime(arg, "%Y%m%d%H%M%S", &ts); + if (tmp == NULL) + tmp = strptime(arg, "%Y%m%d%H%M", &ts); + if (tmp == NULL) + tmp = strptime(arg, "%Y%m%d", &ts); + if (tmp == NULL) + goto fallback; +#else + sscanf(arg, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon, + &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec); + ts.tm_year -= 1900; + ts.tm_mon -= 1; + if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 || + ts.tm_mday <= 0 || ts.tm_mday > 31 || ts.tm_hour > 23 || + ts.tm_min > 59 || ts.tm_sec > 61) + goto fallback; +#endif + ts.tm_isdst = -1; + /* strptime() may only update the specified fields, which does not + * necessarily include ts.tm_yday (%j). Calculate this if unset: + * + * Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec + * 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 + * + * Start with 31 days per month. Even months have only 30 days, but + * reverse in August, subtract one day for those months. February has + * only 28 days, not 30, subtract two days. Add day of month, minus + * one, since day is not finished yet. Leap years handled afterward. */ + if (ts.tm_yday == 0) + ts.tm_yday = (ts.tm_mon * 31) - + ((ts.tm_mon - (ts.tm_mon > 7)) / 2) - + 2 * (ts.tm_mon > 1) + ts.tm_mday - 1; + ret = ts.tm_sec + ts.tm_min*60 + ts.tm_hour*3600 + ts.tm_yday*86400 + + ((__s64) ts.tm_year-70)*31536000 + + (((__s64) ts.tm_year-69)/4)*86400 - + (((__s64) ts.tm_year-1)/100)*86400 + + (((__s64) ts.tm_year+299)/400)*86400; + return ret; +} + +/* + * This function will convert a string to an unsigned long, printing + * an error message if it fails, and returning success or failure in err. + */ +unsigned long parse_ulong(const char *str, const char *cmd, + const char *descr, int *err) +{ + char *tmp; + unsigned long ret; + + ret = strtoul(str, &tmp, 0); + if (*tmp == 0) { + if (err) + *err = 0; + return ret; + } + com_err(cmd, 0, "Bad %s - %s", descr, str); + if (err) + *err = 1; + else + exit(1); + return 0; +} + +/* + * This function will convert a string to an unsigned long long, printing + * an error message if it fails, and returning success or failure in err. + */ +unsigned long long parse_ulonglong(const char *str, const char *cmd, + const char *descr, int *err) +{ + char *tmp; + unsigned long long ret; + + ret = strtoull(str, &tmp, 0); + if (*tmp == 0) { + if (err) + *err = 0; + return ret; + } + com_err(cmd, 0, "Bad %s - %s", descr, str); + if (err) + *err = 1; + else + exit(1); + return 0; +} + +/* + * This function will convert a string to a block number. It returns + * 0 on success, 1 on failure. On failure, it outputs either an optionally + * specified error message or a default. + */ +int strtoblk(const char *cmd, const char *str, const char *errmsg, + blk64_t *ret) +{ + blk64_t blk; + int err; + + if (errmsg == NULL) + blk = parse_ulonglong(str, cmd, "block number", &err); + else + blk = parse_ulonglong(str, cmd, errmsg, &err); + *ret = blk; + return err; +} + +/* + * This is a common helper function used by the command processing + * routines + */ +int common_args_process(int argc, char *argv[], int min_argc, int max_argc, + const char *cmd, const char *usage, int flags) +{ + if (argc < min_argc || argc > max_argc) { + com_err(argv[0], 0, "Usage: %s %s", cmd, usage); + return 1; + } + if (flags & CHECK_FS_NOTOPEN) { + if (check_fs_not_open(argv[0])) + return 1; + } else { + if (check_fs_open(argv[0])) + return 1; + } + if ((flags & CHECK_FS_RW) && check_fs_read_write(argv[0])) + return 1; + if ((flags & CHECK_FS_BITMAPS) && check_fs_bitmaps(argv[0])) + return 1; + return 0; +} + +/* + * This is a helper function used by do_stat, do_freei, do_seti, and + * do_testi, etc. Basically, any command which takes a single + * argument which is a file/inode number specifier. + */ +int common_inode_args_process(int argc, char *argv[], + ext2_ino_t *inode, int flags) +{ + if (common_args_process(argc, argv, 2, 2, argv[0], "<file>", flags)) + return 1; + + *inode = string_to_inode(argv[1]); + if (!*inode) + return 1; + return 0; +} + +/* + * This is a helper function used by do_freeb, do_setb, and do_testb + */ +int common_block_args_process(int argc, char *argv[], + blk64_t *block, blk64_t *count) +{ + int err; + + if (common_args_process(argc, argv, 2, 3, argv[0], + "<block> [count]", CHECK_FS_BITMAPS)) + return 1; + + if (strtoblk(argv[0], argv[1], NULL, block)) + return 1; + if (*block == 0) { + com_err(argv[0], 0, "Invalid block number 0"); + return 1; + } + + if (argc > 2) { + err = strtoblk(argv[0], argv[2], "count", count); + if (err) + return 1; + } + return 0; +} + +int debugfs_read_inode2(ext2_ino_t ino, struct ext2_inode * inode, + const char *cmd, int bufsize, int flags) +{ + int retval; + + retval = ext2fs_read_inode2(current_fs, ino, inode, bufsize, flags); + if (retval) { + com_err(cmd, retval, "while reading inode %u", ino); + return 1; + } + return 0; +} + +int debugfs_read_inode(ext2_ino_t ino, struct ext2_inode * inode, + const char *cmd) +{ + int retval; + + retval = ext2fs_read_inode(current_fs, ino, inode); + if (retval) { + com_err(cmd, retval, "while reading inode %u", ino); + return 1; + } + return 0; +} + +int debugfs_write_inode2(ext2_ino_t ino, + struct ext2_inode *inode, + const char *cmd, + int bufsize, int flags) +{ + int retval; + + retval = ext2fs_write_inode2(current_fs, ino, inode, bufsize, flags); + if (retval) { + com_err(cmd, retval, "while writing inode %u", ino); + return 1; + } + return 0; +} + +int debugfs_write_inode(ext2_ino_t ino, struct ext2_inode * inode, + const char *cmd) +{ + int retval; + + retval = ext2fs_write_inode(current_fs, ino, inode); + if (retval) { + com_err(cmd, retval, "while writing inode %u", ino); + return 1; + } + return 0; +} + +int debugfs_write_new_inode(ext2_ino_t ino, struct ext2_inode * inode, + const char *cmd) +{ + int retval; + + retval = ext2fs_write_new_inode(current_fs, ino, inode); + if (retval) { + com_err(cmd, retval, "while creating inode %u", ino); + return 1; + } + return 0; +} + +/* + * Given a mode, return the ext2 file type + */ +int ext2_file_type(unsigned int mode) +{ + if (LINUX_S_ISREG(mode)) + return EXT2_FT_REG_FILE; + + if (LINUX_S_ISDIR(mode)) + return EXT2_FT_DIR; + + if (LINUX_S_ISCHR(mode)) + return EXT2_FT_CHRDEV; + + if (LINUX_S_ISBLK(mode)) + return EXT2_FT_BLKDEV; + + if (LINUX_S_ISLNK(mode)) + return EXT2_FT_SYMLINK; + + if (LINUX_S_ISFIFO(mode)) + return EXT2_FT_FIFO; + + if (LINUX_S_ISSOCK(mode)) + return EXT2_FT_SOCK; + + return 0; +} + +errcode_t read_list(char *str, blk64_t **list, size_t *len) +{ + blk64_t *lst = *list; + size_t ln = *len; + char *tok, *p = str; + errcode_t retval = 0; + + while ((tok = strtok(p, ","))) { + blk64_t *l; + blk64_t x, y; + char *e; + + errno = 0; + y = x = strtoull(tok, &e, 0); + if (errno) { + retval = errno; + break; + } + if (*e == '-') { + y = strtoull(e + 1, NULL, 0); + if (errno) { + retval = errno; + break; + } + } else if (*e != 0) { + retval = EINVAL; + break; + } + if (y < x) { + retval = EINVAL; + break; + } + l = realloc(lst, sizeof(blk64_t) * (ln + y - x + 1)); + if (l == NULL) { + retval = ENOMEM; + break; + } + lst = l; + for (; x <= y; x++) + lst[ln++] = x; + p = NULL; + } + + *list = lst; + *len = ln; + return retval; +} + +void do_byte_hexdump(FILE *fp, unsigned char *buf, size_t bufsize) +{ + size_t i, j, max; + int suppress = -1; + + for (i = 0; i < bufsize; i += 16) { + max = (bufsize - i > 16) ? 16 : bufsize - i; + if (suppress < 0) { + if (i && memcmp(buf + i, buf + i - max, max) == 0) { + suppress = i; + fprintf(fp, "*\n"); + continue; + } + } else { + if (memcmp(buf + i, buf + suppress, max) == 0) + continue; + suppress = -1; + } + fprintf(fp, "%04o ", (unsigned int)i); + for (j = 0; j < 16; j++) { + if (j < max) + fprintf(fp, "%02x", buf[i+j]); + else + fprintf(fp, " "); + if ((j % 2) == 1) + fprintf(fp, " "); + } + fprintf(fp, " "); + for (j = 0; j < max; j++) + fprintf(fp, "%c", isprint(buf[i+j]) ? buf[i+j] : '.'); + fprintf(fp, "\n"); + } + fprintf(fp, "\n"); +} |