savecore.c revision 66429
11558Srgrimes/*- 21558Srgrimes * Copyright (c) 1986, 1992, 1993 31558Srgrimes * The Regents of the University of California. All rights reserved. 41558Srgrimes * 51558Srgrimes * Redistribution and use in source and binary forms, with or without 61558Srgrimes * modification, are permitted provided that the following conditions 71558Srgrimes * are met: 81558Srgrimes * 1. Redistributions of source code must retain the above copyright 91558Srgrimes * notice, this list of conditions and the following disclaimer. 101558Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111558Srgrimes * notice, this list of conditions and the following disclaimer in the 121558Srgrimes * documentation and/or other materials provided with the distribution. 131558Srgrimes * 3. All advertising materials mentioning features or use of this software 141558Srgrimes * must display the following acknowledgement: 151558Srgrimes * This product includes software developed by the University of 161558Srgrimes * California, Berkeley and its contributors. 171558Srgrimes * 4. Neither the name of the University nor the names of its contributors 181558Srgrimes * may be used to endorse or promote products derived from this software 191558Srgrimes * without specific prior written permission. 201558Srgrimes * 211558Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221558Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231558Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241558Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251558Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261558Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271558Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281558Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291558Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301558Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311558Srgrimes * SUCH DAMAGE. 321558Srgrimes */ 331558Srgrimes 341558Srgrimes#ifndef lint 3537909Scharnierstatic const char copyright[] = 361558Srgrimes"@(#) Copyright (c) 1986, 1992, 1993\n\ 371558Srgrimes The Regents of the University of California. All rights reserved.\n"; 381558Srgrimes#endif /* not lint */ 391558Srgrimes 401558Srgrimes#ifndef lint 4137909Scharnier#if 0 421558Srgrimesstatic char sccsid[] = "@(#)savecore.c 8.3 (Berkeley) 1/2/94"; 4337909Scharnier#endif 4437909Scharnierstatic const char rcsid[] = 4550476Speter "$FreeBSD: head/sbin/savecore/savecore.c 66429 2000-09-28 20:09:36Z des $"; 461558Srgrimes#endif /* not lint */ 471558Srgrimes 481558Srgrimes#include <sys/param.h> 491558Srgrimes#include <sys/stat.h> 501558Srgrimes#include <sys/mount.h> 511558Srgrimes#include <sys/syslog.h> 5247095Sluoqi#include <sys/sysctl.h> 531558Srgrimes 541599Srgrimes#include <vm/vm.h> 551618Srgrimes#include <vm/vm_param.h> 5612806Speter#include <vm/pmap.h> 571599Srgrimes 581558Srgrimes#include <errno.h> 591558Srgrimes#include <fcntl.h> 601558Srgrimes#include <nlist.h> 611558Srgrimes#include <paths.h> 621558Srgrimes#include <stdio.h> 631558Srgrimes#include <stdlib.h> 641558Srgrimes#include <string.h> 651558Srgrimes#include <unistd.h> 6617717Swosch#include "zopen.h" 671558Srgrimes 6844688Sgallatin#ifdef __alpha__ 6944688Sgallatin#define ok(number) ALPHA_K0SEG_TO_PHYS(number) 7044688Sgallatin#endif 7144688Sgallatin 7244688Sgallatin#ifdef __i386__ 731558Srgrimes#define ok(number) ((number) - KERNBASE) 7444688Sgallatin#endif 751558Srgrimes 761558Srgrimesstruct nlist current_nl[] = { /* Namelist for currently running system. */ 7747095Sluoqi#define X_DUMPLO 0 781558Srgrimes { "_dumplo" }, 7947095Sluoqi#define X_TIME 1 8034963Sphk { "_time_second" }, 8147095Sluoqi#define X_DUMPSIZE 2 821558Srgrimes { "_dumpsize" }, 8347095Sluoqi#define X_VERSION 3 841558Srgrimes { "_version" }, 8547095Sluoqi#define X_PANICSTR 4 861558Srgrimes { "_panicstr" }, 8747095Sluoqi#define X_DUMPMAG 5 881558Srgrimes { "_dumpmag" }, 891558Srgrimes { "" }, 901558Srgrimes}; 9147095Sluoqiint cursyms[] = { X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; 921558Srgrimesint dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 }; 931558Srgrimes 941558Srgrimesstruct nlist dump_nl[] = { /* Name list for dumped system. */ 9547095Sluoqi { "_dumplo" }, /* Entries MUST be the same as */ 9647095Sluoqi { "_time_second" }, /* those in current_nl[]. */ 971558Srgrimes { "_dumpsize" }, 981558Srgrimes { "_version" }, 991558Srgrimes { "_panicstr" }, 1001558Srgrimes { "_dumpmag" }, 1011558Srgrimes { "" }, 1021558Srgrimes}; 1031558Srgrimes 1041558Srgrimes/* Types match kernel declarations. */ 10560213Spsoff_t dumplo; /* where dump starts on dumpdev */ 1061558Srgrimesint dumpmag; /* magic number in dump */ 1071558Srgrimesint dumpsize; /* amount of memory dumped */ 1081558Srgrimes 1091856Sdgchar *kernel; 11065396Speterchar *savedir; /* directory to save dumps in */ 1111558Srgrimeschar *ddname; /* name of dump device */ 1121558Srgrimesdev_t dumpdev; /* dump device */ 11358324Spsint dumpfd; /* read/write descriptor on char dev */ 1141558Srgrimestime_t now; /* current date */ 1151558Srgrimeschar panic_mesg[1024]; 1161558Srgrimesint panicstr; 1171558Srgrimeschar vers[1024]; 1181558Srgrimes 1191558Srgrimesint clear, compress, force, verbose; /* flags */ 1201558Srgrimes 1211558Srgrimesvoid check_kmem __P((void)); 1221558Srgrimesint check_space __P((void)); 1231558Srgrimesvoid clear_dump __P((void)); 12450711Sphkvoid DumpRead __P((int fd, void *bp, int size, off_t off, int flag)); 12550711Sphkvoid DumpWrite __P((int fd, void *bp, int size, off_t off, int flag)); 1261558Srgrimesint dump_exists __P((void)); 12753919Sachechar *find_dev __P((dev_t)); 1281558Srgrimesint get_crashtime __P((void)); 12918916Sjoergvoid get_dumpsize __P((void)); 1301558Srgrimesvoid kmem_setup __P((void)); 1311558Srgrimesvoid log __P((int, char *, ...)); 1321558Srgrimesvoid Lseek __P((int, off_t, int)); 1333041Swollmanint Open __P((const char *, int rw)); 1341558Srgrimesint Read __P((int, void *, int)); 1351558Srgrimesvoid save_core __P((void)); 1361558Srgrimesvoid usage __P((void)); 1371558Srgrimesvoid Write __P((int, void *, int)); 1381558Srgrimes 1391558Srgrimesint 1401558Srgrimesmain(argc, argv) 1411558Srgrimes int argc; 1421558Srgrimes char *argv[]; 1431558Srgrimes{ 1441558Srgrimes int ch; 1451558Srgrimes 1461558Srgrimes openlog("savecore", LOG_PERROR, LOG_DAEMON); 1471558Srgrimes 14824359Simp while ((ch = getopt(argc, argv, "cdfN:vz")) != -1) 1491558Srgrimes switch(ch) { 1501558Srgrimes case 'c': 1511558Srgrimes clear = 1; 1521558Srgrimes break; 1531558Srgrimes case 'd': /* Not documented. */ 1541558Srgrimes case 'v': 1551558Srgrimes verbose = 1; 1561558Srgrimes break; 1571558Srgrimes case 'f': 1581558Srgrimes force = 1; 1591558Srgrimes break; 1601558Srgrimes case 'N': 1611856Sdg kernel = optarg; 1621558Srgrimes break; 1631558Srgrimes case 'z': 1641558Srgrimes compress = 1; 1651558Srgrimes break; 1661558Srgrimes case '?': 1671558Srgrimes default: 1681558Srgrimes usage(); 1691558Srgrimes } 1701558Srgrimes argc -= optind; 1711558Srgrimes argv += optind; 1721558Srgrimes 1731558Srgrimes if (!clear) { 1741558Srgrimes if (argc != 1 && argc != 2) 1751558Srgrimes usage(); 17665396Speter savedir = argv[0]; 1771558Srgrimes } 1781558Srgrimes if (argc == 2) 1791856Sdg kernel = argv[1]; 1801558Srgrimes 1811558Srgrimes (void)time(&now); 1821558Srgrimes kmem_setup(); 1831558Srgrimes 1841558Srgrimes if (clear) { 1851558Srgrimes clear_dump(); 1861558Srgrimes exit(0); 1871558Srgrimes } 1881558Srgrimes 1891558Srgrimes if (!dump_exists() && !force) 1901558Srgrimes exit(1); 1911558Srgrimes 1921558Srgrimes check_kmem(); 1931558Srgrimes 1941558Srgrimes if (panicstr) 1951558Srgrimes syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); 1961558Srgrimes else 1971558Srgrimes syslog(LOG_ALERT, "reboot"); 1981558Srgrimes 19918914Sfenner get_dumpsize(); 20018914Sfenner 2011558Srgrimes if ((!get_crashtime() || !check_space()) && !force) 2021558Srgrimes exit(1); 2031558Srgrimes 2041558Srgrimes save_core(); 2051558Srgrimes 2061558Srgrimes clear_dump(); 2071558Srgrimes exit(0); 2081558Srgrimes} 2091558Srgrimes 2101558Srgrimesvoid 2111558Srgrimeskmem_setup() 2121558Srgrimes{ 2131558Srgrimes FILE *fp; 2141558Srgrimes int kmem, i; 2153041Swollman const char *dump_sys; 21647095Sluoqi int mib[2]; 21747095Sluoqi size_t len; 21860293Sps long kdumplo; /* block number where dump starts on dumpdev */ 2198871Srgrimes 2201558Srgrimes /* 2211558Srgrimes * Some names we need for the currently running system, others for 2221558Srgrimes * the system that was running when the dump was made. The values 2231558Srgrimes * obtained from the current system are used to look for things in 2241558Srgrimes * /dev/kmem that cannot be found in the dump_sys namelist, but are 2251558Srgrimes * presumed to be the same (since the disk partitions are probably 2261558Srgrimes * the same!) 2271558Srgrimes */ 2283041Swollman if ((nlist(getbootfile(), current_nl)) == -1) 2298871Srgrimes syslog(LOG_ERR, "%s: nlist: %s", getbootfile(), 2303041Swollman strerror(errno)); 2311558Srgrimes for (i = 0; cursyms[i] != -1; i++) 2321558Srgrimes if (current_nl[cursyms[i]].n_value == 0) { 2331558Srgrimes syslog(LOG_ERR, "%s: %s not in namelist", 2343041Swollman getbootfile(), current_nl[cursyms[i]].n_name); 2351558Srgrimes exit(1); 2361558Srgrimes } 2371558Srgrimes 2383041Swollman dump_sys = kernel ? kernel : getbootfile(); 2391558Srgrimes if ((nlist(dump_sys, dump_nl)) == -1) 2401558Srgrimes syslog(LOG_ERR, "%s: nlist: %s", dump_sys, strerror(errno)); 2411558Srgrimes for (i = 0; dumpsyms[i] != -1; i++) 2421558Srgrimes if (dump_nl[dumpsyms[i]].n_value == 0) { 2431558Srgrimes syslog(LOG_ERR, "%s: %s not in namelist", 2441558Srgrimes dump_sys, dump_nl[dumpsyms[i]].n_name); 2451558Srgrimes exit(1); 2461558Srgrimes } 2471558Srgrimes 24847095Sluoqi mib[0] = CTL_KERN; 24947095Sluoqi mib[1] = KERN_DUMPDEV; 25047095Sluoqi len = sizeof dumpdev; 25147095Sluoqi if (sysctl(mib, 2, &dumpdev, &len, NULL, 0) == -1) { 25247095Sluoqi syslog(LOG_ERR, "sysctl: kern.dumpdev: %m"); 25347095Sluoqi exit(1); 25447095Sluoqi } 2551558Srgrimes if (dumpdev == NODEV) { 2561558Srgrimes syslog(LOG_WARNING, "no core dump (no dumpdev)"); 2571558Srgrimes exit(1); 2581558Srgrimes } 25947095Sluoqi 26047095Sluoqi kmem = Open(_PATH_KMEM, O_RDONLY); 2611558Srgrimes Lseek(kmem, (off_t)current_nl[X_DUMPLO].n_value, L_SET); 26260219Sps (void)Read(kmem, &kdumplo, sizeof(kdumplo)); 26360293Sps dumplo = (off_t)kdumplo * DEV_BSIZE; 2641558Srgrimes if (verbose) 26560293Sps (void)printf("dumplo = %lld (%ld * %d)\n", 26660293Sps (long long)dumplo, kdumplo, DEV_BSIZE); 2671558Srgrimes Lseek(kmem, (off_t)current_nl[X_DUMPMAG].n_value, L_SET); 2681558Srgrimes (void)Read(kmem, &dumpmag, sizeof(dumpmag)); 26953919Sache ddname = find_dev(dumpdev); 2701558Srgrimes dumpfd = Open(ddname, O_RDWR); 2711558Srgrimes fp = fdopen(kmem, "r"); 2721558Srgrimes if (fp == NULL) { 2731558Srgrimes syslog(LOG_ERR, "%s: fdopen: %m", _PATH_KMEM); 2741558Srgrimes exit(1); 2751558Srgrimes } 2761856Sdg if (kernel) 2771558Srgrimes return; 2781558Srgrimes (void)fseek(fp, (off_t)current_nl[X_VERSION].n_value, L_SET); 2791558Srgrimes (void)fgets(vers, sizeof(vers), fp); 2801558Srgrimes 2811558Srgrimes /* Don't fclose(fp), we use dumpfd later. */ 2821558Srgrimes} 2831558Srgrimes 2841558Srgrimesvoid 2851558Srgrimescheck_kmem() 2861558Srgrimes{ 28750711Sphk char core_vers[1024], *p; 2881558Srgrimes 28950711Sphk DumpRead(dumpfd, core_vers, sizeof(core_vers), 29050711Sphk (off_t)(dumplo + ok(dump_nl[X_VERSION].n_value)), L_SET); 29150711Sphk core_vers[sizeof(core_vers) - 1] = '\0'; 29250711Sphk p = strchr(core_vers, '\n'); 29350711Sphk if (p) 29450711Sphk p[1] = '\0'; 2951856Sdg if (strcmp(vers, core_vers) && kernel == 0) 2961558Srgrimes syslog(LOG_WARNING, 29750711Sphk "warning: %s version mismatch:\n\t\"%s\"\nand\t\"%s\"\n", 2983041Swollman getbootfile(), vers, core_vers); 29950711Sphk DumpRead(dumpfd, &panicstr, sizeof(panicstr), 3001558Srgrimes (off_t)(dumplo + ok(dump_nl[X_PANICSTR].n_value)), L_SET); 3011558Srgrimes if (panicstr) { 30250711Sphk DumpRead(dumpfd, panic_mesg, sizeof(panic_mesg), 30350711Sphk (off_t)(dumplo + ok(panicstr)), L_SET); 3041558Srgrimes } 3051558Srgrimes} 3061558Srgrimes 3071558Srgrimesvoid 3081558Srgrimesclear_dump() 3091558Srgrimes{ 3101558Srgrimes long newdumplo; 3111558Srgrimes 3121558Srgrimes newdumplo = 0; 31350711Sphk DumpWrite(dumpfd, &newdumplo, sizeof(newdumplo), 31450711Sphk (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); 31558324Sps close(dumpfd); 3161558Srgrimes} 3171558Srgrimes 3181558Srgrimesint 3191558Srgrimesdump_exists() 3201558Srgrimes{ 3211558Srgrimes int newdumpmag; 3221558Srgrimes 32350711Sphk DumpRead(dumpfd, &newdumpmag, sizeof(newdumpmag), 32450711Sphk (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); 3251558Srgrimes if (newdumpmag != dumpmag) { 3261558Srgrimes if (verbose) 3271558Srgrimes syslog(LOG_WARNING, "magic number mismatch (%x != %x)", 3281558Srgrimes newdumpmag, dumpmag); 3291558Srgrimes syslog(LOG_WARNING, "no core dump"); 3301558Srgrimes return (0); 3311558Srgrimes } 3321558Srgrimes return (1); 3331558Srgrimes} 3341558Srgrimes 3351558Srgrimeschar buf[1024 * 1024]; 3361558Srgrimes 3371558Srgrimesvoid 3381558Srgrimessave_core() 3391558Srgrimes{ 3401558Srgrimes register FILE *fp; 34166429Sdes register int bounds, ifd, nr, nw; 34258324Sps char path[MAXPATHLEN]; 34318916Sjoerg mode_t oumask; 3441558Srgrimes 3451558Srgrimes /* 3461558Srgrimes * Get the current number and update the bounds file. Do the update 3471558Srgrimes * now, because may fail later and don't want to overwrite anything. 3481558Srgrimes */ 34965396Speter (void)snprintf(path, sizeof(path), "%s/bounds", savedir); 3501558Srgrimes if ((fp = fopen(path, "r")) == NULL) 3511558Srgrimes goto err1; 3521558Srgrimes if (fgets(buf, sizeof(buf), fp) == NULL) { 3531558Srgrimes if (ferror(fp)) 3541558Srgrimeserr1: syslog(LOG_WARNING, "%s: %s", path, strerror(errno)); 3551558Srgrimes bounds = 0; 3561558Srgrimes } else 3571558Srgrimes bounds = atoi(buf); 3581558Srgrimes if (fp != NULL) 3591558Srgrimes (void)fclose(fp); 3601558Srgrimes if ((fp = fopen(path, "w")) == NULL) 3611558Srgrimes syslog(LOG_ERR, "%s: %m", path); 3621558Srgrimes else { 3631558Srgrimes (void)fprintf(fp, "%d\n", bounds + 1); 3641558Srgrimes (void)fclose(fp); 3651558Srgrimes } 3661558Srgrimes 3671558Srgrimes /* Create the core file. */ 36818916Sjoerg oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/ 3691558Srgrimes (void)snprintf(path, sizeof(path), "%s/vmcore.%d%s", 37065396Speter savedir, bounds, compress ? ".Z" : ""); 37166429Sdes if (compress) 37266429Sdes fp = zopen(path, "w", 0); 37366429Sdes else 37466429Sdes fp = fopen(path, "w"); 37566429Sdes if (fp == NULL) { 37666429Sdes syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 37766429Sdes exit(1); 37866429Sdes } 37918916Sjoerg (void)umask(oumask); 3801558Srgrimes 3811558Srgrimes /* Seek to the start of the core. */ 38258324Sps Lseek(dumpfd, (off_t)dumplo, L_SET); 3831558Srgrimes 3841558Srgrimes /* Copy the core file. */ 3851558Srgrimes syslog(LOG_NOTICE, "writing %score to %s", 3861558Srgrimes compress ? "compressed " : "", path); 3871558Srgrimes for (; dumpsize > 0; dumpsize -= nr) { 3881558Srgrimes (void)printf("%6dK\r", dumpsize / 1024); 3891558Srgrimes (void)fflush(stdout); 39058324Sps nr = read(dumpfd, buf, MIN(dumpsize, sizeof(buf))); 3911558Srgrimes if (nr <= 0) { 3921558Srgrimes if (nr == 0) 3931558Srgrimes syslog(LOG_WARNING, 3941558Srgrimes "WARNING: EOF on dump device"); 3951558Srgrimes else 39658324Sps syslog(LOG_ERR, "%s: %m", ddname); 3971558Srgrimes goto err2; 3981558Srgrimes } 39966429Sdes nw = fwrite(buf, 1, nr, fp); 4001558Srgrimes if (nw != nr) { 4011558Srgrimes syslog(LOG_ERR, "%s: %s", 4021558Srgrimes path, strerror(nw == 0 ? EIO : errno)); 4031558Srgrimeserr2: syslog(LOG_WARNING, 4041558Srgrimes "WARNING: vmcore may be incomplete"); 4051558Srgrimes (void)printf("\n"); 4061558Srgrimes exit(1); 4071558Srgrimes } 4081558Srgrimes } 40958324Sps 41066429Sdes (void)fclose(fp); 4111558Srgrimes 4121558Srgrimes /* Copy the kernel. */ 4133041Swollman ifd = Open(kernel ? kernel : getbootfile(), O_RDONLY); 4141856Sdg (void)snprintf(path, sizeof(path), "%s/kernel.%d%s", 41565396Speter savedir, bounds, compress ? ".Z" : ""); 41666429Sdes if (compress) 41766429Sdes fp = zopen(path, "w", 0); 41866429Sdes else 41966429Sdes fp = fopen(path, "w"); 42066429Sdes if (fp == NULL) { 42166429Sdes syslog(LOG_ERR, "%s: %s", path, strerror(errno)); 42266429Sdes exit(1); 42366429Sdes } 4241558Srgrimes syslog(LOG_NOTICE, "writing %skernel to %s", 4251558Srgrimes compress ? "compressed " : "", path); 4261558Srgrimes while ((nr = read(ifd, buf, sizeof(buf))) > 0) { 42766429Sdes nw = fwrite(buf, 1, nr, fp); 4281558Srgrimes if (nw != nr) { 4291558Srgrimes syslog(LOG_ERR, "%s: %s", 4301558Srgrimes path, strerror(nw == 0 ? EIO : errno)); 4311558Srgrimes syslog(LOG_WARNING, 4321856Sdg "WARNING: kernel may be incomplete"); 4331558Srgrimes exit(1); 4341558Srgrimes } 4351558Srgrimes } 4361558Srgrimes if (nr < 0) { 4371558Srgrimes syslog(LOG_ERR, "%s: %s", 4383041Swollman kernel ? kernel : getbootfile(), strerror(errno)); 4391558Srgrimes syslog(LOG_WARNING, 4401856Sdg "WARNING: kernel may be incomplete"); 4411558Srgrimes exit(1); 4421558Srgrimes } 44366429Sdes (void)fclose(fp); 44458324Sps close(ifd); 4451558Srgrimes} 4461558Srgrimes 4471558Srgrimeschar * 44853919Sachefind_dev(dev) 4491558Srgrimes register dev_t dev; 4501558Srgrimes{ 45166429Sdes char *dn; 4521558Srgrimes 45366429Sdes if ((dn = devname(dev, S_IFCHR)) != NULL) { 45466429Sdes if (asprintf(&dn, "/dev/%s", dn) != -1) 45566429Sdes return dn; 45666429Sdes syslog(LOG_ERR, "insufficient memory"); 45766429Sdes } else { 45866429Sdes syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); 4591558Srgrimes } 4601558Srgrimes exit(1); 4611558Srgrimes} 4621558Srgrimes 4631558Srgrimesint 4641558Srgrimesget_crashtime() 4651558Srgrimes{ 4661558Srgrimes time_t dumptime; /* Time the dump was taken. */ 4671558Srgrimes 46850711Sphk DumpRead(dumpfd, &dumptime, sizeof(dumptime), 46950711Sphk (off_t)(dumplo + ok(dump_nl[X_TIME].n_value)), L_SET); 4701558Srgrimes if (dumptime == 0) { 4711558Srgrimes if (verbose) 4721558Srgrimes syslog(LOG_ERR, "dump time is zero"); 4731558Srgrimes return (0); 4741558Srgrimes } 4751558Srgrimes (void)printf("savecore: system went down at %s", ctime(&dumptime)); 4769987Swollman#define LEEWAY (7 * 86400) 4771558Srgrimes if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { 4781558Srgrimes (void)printf("dump time is unreasonable\n"); 4791558Srgrimes return (0); 4801558Srgrimes } 4811558Srgrimes return (1); 4821558Srgrimes} 4831558Srgrimes 48418916Sjoergvoid 48518914Sfennerget_dumpsize() 48618914Sfenner{ 48718914Sfenner /* Read the dump size. */ 48850711Sphk DumpRead(dumpfd, &dumpsize, sizeof(dumpsize), 48950711Sphk (off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET); 49018914Sfenner dumpsize *= getpagesize(); 49118914Sfenner} 49218914Sfenner 49318914Sfennerint 4941558Srgrimescheck_space() 4951558Srgrimes{ 4961558Srgrimes register FILE *fp; 4973041Swollman const char *tkernel; 49818914Sfenner off_t minfree, spacefree, totfree, kernelsize, needed; 4991558Srgrimes struct stat st; 5001558Srgrimes struct statfs fsbuf; 5011558Srgrimes char buf[100], path[MAXPATHLEN]; 5021558Srgrimes 5033041Swollman tkernel = kernel ? kernel : getbootfile(); 5041856Sdg if (stat(tkernel, &st) < 0) { 5051856Sdg syslog(LOG_ERR, "%s: %m", tkernel); 5061558Srgrimes exit(1); 5071558Srgrimes } 50818934Sjoerg kernelsize = st.st_blocks * S_BLKSIZE; 50918914Sfenner 51065396Speter if (statfs(savedir, &fsbuf) < 0) { 51165396Speter syslog(LOG_ERR, "%s: %m", savedir); 5121558Srgrimes exit(1); 5131558Srgrimes } 51418042Sdg spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024; 51518914Sfenner totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024; 5161558Srgrimes 51765396Speter (void)snprintf(path, sizeof(path), "%s/minfree", savedir); 5181558Srgrimes if ((fp = fopen(path, "r")) == NULL) 5191558Srgrimes minfree = 0; 5201558Srgrimes else { 5211558Srgrimes if (fgets(buf, sizeof(buf), fp) == NULL) 5221558Srgrimes minfree = 0; 5231558Srgrimes else 5241558Srgrimes minfree = atoi(buf); 5251558Srgrimes (void)fclose(fp); 5261558Srgrimes } 5271558Srgrimes 5281856Sdg needed = (dumpsize + kernelsize) / 1024; 52918914Sfenner if (((minfree > 0) ? spacefree : totfree) - needed < minfree) { 5301558Srgrimes syslog(LOG_WARNING, 53158403Sbde "no dump, not enough free space on device (%lld available, need %lld)", 53258403Sbde (long long)(minfree > 0 ? spacefree : totfree), 53358403Sbde (long long)needed); 5341558Srgrimes return (0); 5351558Srgrimes } 53618914Sfenner if (spacefree - needed < 0) 5371558Srgrimes syslog(LOG_WARNING, 5381558Srgrimes "dump performed, but free space threshold crossed"); 5391558Srgrimes return (1); 5401558Srgrimes} 5411558Srgrimes 5421558Srgrimesint 5431558SrgrimesOpen(name, rw) 5443041Swollman const char *name; 5451558Srgrimes int rw; 5461558Srgrimes{ 5471558Srgrimes int fd; 5481558Srgrimes 5491558Srgrimes if ((fd = open(name, rw, 0)) < 0) { 5501558Srgrimes syslog(LOG_ERR, "%s: %m", name); 5511558Srgrimes exit(1); 5521558Srgrimes } 5531558Srgrimes return (fd); 5541558Srgrimes} 5551558Srgrimes 5561558Srgrimesint 5571558SrgrimesRead(fd, bp, size) 5581558Srgrimes int fd, size; 5591558Srgrimes void *bp; 5601558Srgrimes{ 5611558Srgrimes int nr; 5621558Srgrimes 5631558Srgrimes nr = read(fd, bp, size); 5641558Srgrimes if (nr != size) { 5651558Srgrimes syslog(LOG_ERR, "read: %m"); 5661558Srgrimes exit(1); 5671558Srgrimes } 5681558Srgrimes return (nr); 5691558Srgrimes} 5701558Srgrimes 5711558Srgrimesvoid 5721558SrgrimesLseek(fd, off, flag) 5731558Srgrimes int fd, flag; 5741558Srgrimes off_t off; 5751558Srgrimes{ 5761558Srgrimes off_t ret; 5771558Srgrimes 5781558Srgrimes ret = lseek(fd, off, flag); 5791558Srgrimes if (ret == -1) { 5801558Srgrimes syslog(LOG_ERR, "lseek: %m"); 5811558Srgrimes exit(1); 5821558Srgrimes } 5831558Srgrimes} 5841558Srgrimes 58550711Sphk/* 58650711Sphk * DumpWrite and DumpRead block io requests to the * dump device. 58750711Sphk */ 58850711Sphk#define DUMPBUFSIZE 8192 58950711Sphkvoid 59050711SphkDumpWrite(fd, bp, size, off, flag) 59150711Sphk int fd, size, flag; 59250711Sphk void *bp; 59350711Sphk off_t off; 59450711Sphk{ 59550711Sphk unsigned char buf[DUMPBUFSIZE], *p, *q; 59650711Sphk off_t pos; 59750711Sphk int i, j; 59850711Sphk 59950711Sphk if (flag != L_SET) { 60050711Sphk syslog(LOG_ERR, "lseek: not LSET"); 60150711Sphk exit(2); 60250711Sphk } 60350711Sphk q = bp; 60450711Sphk while (size) { 60550711Sphk pos = off & ~(DUMPBUFSIZE - 1); 60650711Sphk Lseek(fd, pos, flag); 60750711Sphk (void)Read(fd, buf, sizeof(buf)); 60850711Sphk j = off & (DUMPBUFSIZE - 1); 60950711Sphk p = buf + j; 61050711Sphk i = size; 61150711Sphk if (i > DUMPBUFSIZE - j) 61250711Sphk i = DUMPBUFSIZE - j; 61350711Sphk memcpy(p, q, i); 61450711Sphk Lseek(fd, pos, flag); 61550711Sphk (void)Write(fd, buf, sizeof(buf)); 61650711Sphk size -= i; 61750711Sphk q += i; 61850711Sphk off += i; 61950711Sphk } 62050711Sphk} 62150711Sphk 62250711Sphkvoid 62350711SphkDumpRead(fd, bp, size, off, flag) 62450711Sphk int fd, size, flag; 62550711Sphk void *bp; 62650711Sphk off_t off; 62750711Sphk{ 62850711Sphk unsigned char buf[DUMPBUFSIZE], *p, *q; 62950711Sphk off_t pos; 63050711Sphk int i, j; 63150711Sphk 63250711Sphk if (flag != L_SET) { 63350711Sphk syslog(LOG_ERR, "lseek: not LSET"); 63450711Sphk exit(2); 63550711Sphk } 63650711Sphk q = bp; 63750711Sphk while (size) { 63850711Sphk pos = off & ~(DUMPBUFSIZE - 1); 63950711Sphk Lseek(fd, pos, flag); 64050711Sphk (void)Read(fd, buf, sizeof(buf)); 64150711Sphk j = off & (DUMPBUFSIZE - 1); 64250711Sphk p = buf + j; 64350711Sphk i = size; 64450711Sphk if (i > DUMPBUFSIZE - j) 64550711Sphk i = DUMPBUFSIZE - j; 64650711Sphk memcpy(q, p, i); 64750711Sphk size -= i; 64850711Sphk q += i; 64950711Sphk off += i; 65050711Sphk } 65150711Sphk} 65250711Sphk 6531558Srgrimesvoid 6541558SrgrimesWrite(fd, bp, size) 6551558Srgrimes int fd, size; 6561558Srgrimes void *bp; 6571558Srgrimes{ 6581558Srgrimes int n; 6591558Srgrimes 6601558Srgrimes if ((n = write(fd, bp, size)) < size) { 6611558Srgrimes syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); 6621558Srgrimes exit(1); 6631558Srgrimes } 6641558Srgrimes} 6651558Srgrimes 6661558Srgrimesvoid 6671558Srgrimesusage() 6681558Srgrimes{ 6691558Srgrimes (void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory"); 6701558Srgrimes exit(1); 6711558Srgrimes} 672