nscd: add cache dumper
This commit is contained in:
DJ Delorie
parent
2de7fe6253
commit
dcf46d3fe5
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@ -36,7 +36,7 @@ nscd-modules := nscd connections pwdcache getpwnam_r getpwuid_r grpcache \
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getsrvbynm_r getsrvbypt_r servicescache \
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dbg_log nscd_conf nscd_stat cache mem nscd_setup_thread \
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xmalloc xstrdup aicache initgrcache gai res_hconf \
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netgroupcache
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netgroupcache cachedumper
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ifeq ($(build-nscd)$(have-thread-library),yesyes)
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373
nscd/cachedumper.c
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373
nscd/cachedumper.c
Normal file
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@ -0,0 +1,373 @@
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/* Copyright (c) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published
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by the Free Software Foundation; version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>. */
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/* cachedumper - dump a human-readable representation of a cache file. */
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#include <ctype.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <libintl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <arpa/inet.h>
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#include <getopt.h>
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#include "nscd.h"
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#include "dbg_log.h"
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static void *the_cache;
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#define NO_REF ((ref_t)-1)
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/* Given a chunk of raw data CP of length LEN, print it in a hopefully
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user-readable format, including colorizing non-readable characters.
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STR prefixes it, if non-NULL. If LEN is -1, CP is
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NUL-terminated. */
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unsigned char *
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data_string (unsigned char *cp, const char *str, int len)
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{
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int oops = 0;
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unsigned char *cpe = cp + len;
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printf ("%s", str);
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while (len == -1 || cp < cpe)
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{
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if (isgraph (*cp))
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putchar (*cp);
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else
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printf ("\033[%dm<%02x>\033[0m", *cp % 6 + 31, *cp);
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if (len == -1 && *cp == 0)
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return cp + 1;
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++cp;
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if (++oops > 1000)
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break;
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}
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return cp;
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}
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void
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nscd_print_cache (const char *name)
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{
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struct stat st;
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int fd;
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int i;
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if (stat (name, &st) < 0)
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{
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perror (name);
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exit (1);
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}
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fd = open (name, O_RDONLY);
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the_cache = mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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struct database_pers_head *dps = (struct database_pers_head *) the_cache;
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/* Shortcut for "print the cache offset (address) of X in the
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cache". */
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#define A(x) (int)((char *)&(x)-(char *)the_cache)
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/* Common code for "print field DPS->F, it's offset, and contents". */
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#define DPS(f) printf("%08x: %24s : %10d %08x\n", A (dps->f), #f, (int)dps->f, (int)dps->f);
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if (debug_level > 0)
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{
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DPS (version);
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DPS (header_size);
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DPS (gc_cycle);
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DPS (nscd_certainly_running);
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DPS (timestamp);
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DPS (module);
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DPS (data_size);
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DPS (first_free);
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DPS (nentries);
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DPS (maxnentries);
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DPS (maxnsearched);
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DPS (poshit);
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DPS (neghit);
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DPS (posmiss);
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DPS (negmiss);
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DPS (rdlockdelayed);
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DPS (wrlockdelayed);
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DPS (addfailed);
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printf ("\n");
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}
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char *data = (char *) &dps->array[roundup (dps->module,
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ALIGN / sizeof (ref_t))];
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/* Loop through each entry in the hash table, which is of size
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dps->module. Raw data is stored after the hash table in the
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cache file. */
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for (i = 0; i < dps->module; i++)
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{
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ref_t r = dps->array[i];
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if (r == NO_REF)
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continue;
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if (debug_level > 2)
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printf ("hash[%4d] = 0x%x\n", i, r);
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while (r != NO_REF)
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{
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struct hashentry *here = (struct hashentry *) (data + r);
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unsigned char *key = (unsigned char *) data + here->key;
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printf ("\n%08x: type %s key %p \"", A (*here),
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serv2str[here->type], key);
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data_string (key, "", here->len);
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struct datahead *dh = (struct datahead *) (data + here->packet);
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printf ("\" (len:%d) Data %08lx\n", here->len,
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(char *) dh - (char *) the_cache);
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if (debug_level > 0)
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{
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/* Common code for printing fields in struct DATAHEAD DH. */
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#define DH(f) printf ("%08x; %24s : %10d %08x\n", A (dh->f), #f, (int)dh->f, (int)dh->f);
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DH (allocsize);
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DH (recsize);
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DH (timeout);
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DH (notfound);
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DH (nreloads);
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DH (usable);
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DH (unused);
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DH (ttl);
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}
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unsigned char *cp = (unsigned char *) (&dh->data[0]);
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unsigned char *cpe =
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(unsigned char *) (&dh->data[0]) + dh->allocsize;
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int i;
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uint32_t *grplens;
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if (debug_level > 1)
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{
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data_string (cp, _(" - all data: "), cpe - cp);
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printf ("\n");
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}
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/* These two are common to all responses. */
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printf ("V%d F%d",
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dh->data[0].pwdata.version, dh->data[0].pwdata.found);
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/* Shortcut for the common case where we iterate through
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fixed-length strings stored in the data portion of the
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cache. CP is updated to point to the next string. */
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#define DSTR(str, l) cp = data_string (cp, str, l)
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switch (here->type)
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{
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case GETPWBYNAME:
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case GETPWBYUID:
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{
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pw_response_header *pw = &(dh->data[0].pwdata);
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cp += sizeof (*pw);
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DSTR (" name ", pw->pw_name_len);
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DSTR (" passwd ", pw->pw_passwd_len);
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printf (" uid %d gid %d", pw->pw_uid, pw->pw_gid);
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DSTR (" gecos ", pw->pw_gecos_len);
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DSTR (" dir ", pw->pw_dir_len);
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DSTR (" shell ", pw->pw_shell_len);
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DSTR (" byuid ", -1);
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DSTR (" key ", -1);
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printf ("\n");
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}
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break;
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case GETGRBYNAME:
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case GETGRBYGID:
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{
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gr_response_header *gr = &(dh->data[0].grdata);
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cp += sizeof (*gr);
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grplens = (uint32_t *) cp;
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cp += gr->gr_mem_cnt * sizeof (uint32_t);
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DSTR (" name ", gr->gr_name_len);
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DSTR (" passwd ", gr->gr_passwd_len);
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printf (" gid %d members %d [ ", (int) gr->gr_gid,
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(int) gr->gr_mem_cnt);
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for (i = 0; i < gr->gr_mem_cnt; i++)
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DSTR (" ", grplens[i]);
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DSTR (" ] bygid ", -1);
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DSTR (" key ", -1);
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printf ("\n");
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}
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break;
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case GETHOSTBYADDR:
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case GETHOSTBYADDRv6:
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case GETHOSTBYNAME:
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case GETHOSTBYNAMEv6:
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{
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hst_response_header *hst = &(dh->data[0].hstdata);
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printf (" addrtype %d error %d", hst->h_addrtype, hst->error);
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cp += sizeof (*hst);
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DSTR (" name ", hst->h_name_len);
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uint32_t *aliases_len = (uint32_t *) cp;
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cp += hst->h_aliases_cnt * sizeof (uint32_t);
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uint32_t *addrs = (uint32_t *) cp;
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cp += hst->h_length * hst->h_addr_list_cnt;
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if (hst->h_aliases_cnt)
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{
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printf (" aliases [");
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for (i = 0; i < hst->h_aliases_cnt; i++)
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DSTR (" ", aliases_len[i]);
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printf (" ]");
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}
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if (hst->h_addr_list_cnt)
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{
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char buf[INET6_ADDRSTRLEN];
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printf (" addresses [");
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for (i = 0; i < hst->h_addr_list_cnt; i++)
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{
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inet_ntop (hst->h_addrtype, addrs, buf, sizeof (buf));
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printf (" %s", buf);
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addrs += hst->h_length;
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}
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printf (" ]");
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}
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printf ("\n");
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}
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break;
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case GETAI:
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{
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ai_response_header *ai = &(dh->data[0].aidata);
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printf (" naddrs %d addrslen %d canonlen %d error %d [",
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ai->naddrs, ai->addrslen, ai->canonlen, ai->error);
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cp += sizeof (*ai);
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unsigned char *addrs = cp;
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unsigned char *families = cp + ai->addrslen;
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cp = families + ai->naddrs;
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char buf[INET6_ADDRSTRLEN];
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for (i = 0; i < ai->naddrs; i++)
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{
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switch (*families)
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{
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case AF_INET:
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inet_ntop (*families, addrs, buf, sizeof (buf));
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printf (" %s", buf);
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addrs += 4;
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break;
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case AF_INET6:
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inet_ntop (*families, addrs, buf, sizeof (buf));
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printf (" %s", buf);
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addrs += 16;
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break;
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}
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families++;
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}
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DSTR (" ] canon ", ai->canonlen);
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DSTR (" key ", -1);
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printf ("\n");
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}
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break;
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case INITGROUPS:
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{
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initgr_response_header *ig = &(dh->data[0].initgrdata);
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printf (" nresults %d groups [", (int) ig->ngrps);
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cp += sizeof (*ig);
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grplens = (uint32_t *) cp;
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cp += ig->ngrps * sizeof (uint32_t);
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for (i = 0; i < ig->ngrps; i++)
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printf (" %d", grplens[i]);
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DSTR (" ] key ", -1);
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printf ("\n");
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}
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break;
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case GETSERVBYNAME:
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case GETSERVBYPORT:
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{
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serv_response_header *serv = &(dh->data[0].servdata);
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printf (" alias_cnt %d port %d (stored as %d)",
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serv->s_aliases_cnt,
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((serv->s_port & 0xff00) >> 8) | ((serv->
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s_port & 0xff) <<
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8), serv->s_port);
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cp += sizeof (*serv);
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DSTR (" name ", serv->s_name_len);
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DSTR (" proto ", serv->s_proto_len);
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if (serv->s_aliases_cnt)
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{
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uint32_t *alias_len = (uint32_t *) cp;
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printf (" aliases [");
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cp += sizeof (uint32_t) * serv->s_aliases_cnt;
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for (i = 0; i < serv->s_aliases_cnt; i++)
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DSTR (" ", alias_len[i]);
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printf (" ]");
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}
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printf ("\n");
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}
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break;
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case GETNETGRENT:
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{
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netgroup_response_header *ng = &(dh->data[0].netgroupdata);
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printf (" nresults %d len %d\n",
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(int) ng->nresults, (int) ng->result_len);
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cp += sizeof (*ng);
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for (i = 0; i < ng->nresults; i++)
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{
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DSTR (" (", -1);
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DSTR (",", -1);
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DSTR (",", -1);
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printf (")");
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}
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printf ("\n");
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}
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break;
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case INNETGR:
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{
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innetgroup_response_header *ing =
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&(dh->data[0].innetgroupdata);
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printf (" result %d\n", ing->result);
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}
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break;
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default:
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break;
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}
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if (debug_level > 2 && cp && cp < cpe)
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{
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printf (_(" - remaining data %p: "), cp);
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data_string (cp, "", cpe - cp);
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printf ("\n");
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}
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r = here->next;
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}
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}
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munmap (the_cache, st.st_size);
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exit (0);
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}
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13
nscd/nscd.c
13
nscd/nscd.c
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@ -77,6 +77,8 @@ static run_modes run_mode = RUN_DAEMONIZE;
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static const char *conffile = _PATH_NSCDCONF;
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static const char *print_cache = NULL;
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time_t start_time;
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uintptr_t pagesize_m1;
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@ -106,6 +108,8 @@ static const struct argp_option options[] =
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N_("Read configuration data from NAME") },
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{ "debug", 'd', NULL, 0,
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N_("Do not fork and display messages on the current tty") },
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{ "print", 'p', N_("NAME"), 0,
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N_("Print contents of the offline cache file NAME") },
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{ "foreground", 'F', NULL, 0,
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N_("Do not fork, but otherwise behave like a daemon") },
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{ "nthreads", 't', N_("NUMBER"), 0, N_("Start NUMBER threads") },
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@ -157,6 +161,11 @@ main (int argc, char **argv)
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exit (1);
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}
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/* Print the contents of the indicated cache file. */
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if (print_cache != NULL)
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/* Does not return. */
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nscd_print_cache (print_cache);
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/* Read the configuration file. */
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if (nscd_parse_file (conffile, dbs) != 0)
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/* We couldn't read the configuration file. We don't start the
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@ -404,6 +413,10 @@ parse_opt (int key, char *arg, struct argp_state *state)
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run_mode = RUN_DEBUG;
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break;
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case 'p':
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print_cache = arg;
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break;
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case 'F':
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run_mode = RUN_FOREGROUND;
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break;
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@ -364,6 +364,8 @@ extern void gc (struct database_dyn *db);
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/* nscd_setup_thread.c */
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extern int setup_thread (struct database_dyn *db);
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/* cachedumper.c */
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extern void nscd_print_cache (const char *name);
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/* Special version of TEMP_FAILURE_RETRY for functions returning error
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values. */
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