/* $NetBSD: savecore_old.c,v 1.1.1.1 1996/03/16 10:25:11 leo Exp $ */ /*- * Copyright (c) 1986, 1992, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1986, 1992, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)savecore.c 8.3 (Berkeley) 1/2/94"; #else static char rcsid[] = "$NetBSD: savecore_old.c,v 1.1.1.1 1996/03/16 10:25:11 leo Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern FILE *zopen __P((const char *fname, const char *mode, int bits)); #define ok(number) ((number) - KERNBASE) struct nlist current_nl[] = { /* Namelist for currently running system. */ #define X_DUMPDEV 0 { "_dumpdev" }, #define X_DUMPLO 1 { "_dumplo" }, #define X_TIME 2 { "_time" }, #define X_DUMPSIZE 3 { "_dumpsize" }, #define X_VERSION 4 { "_version" }, #define X_PANICSTR 5 { "_panicstr" }, #define X_DUMPMAG 6 { "_dumpmag" }, { "" }, }; int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 }; int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 }; struct nlist dump_nl[] = { /* Name list for dumped system. */ { "_dumpdev" }, /* Entries MUST be the same as */ { "_dumplo" }, /* those in current_nl[]. */ { "_time" }, { "_dumpsize" }, { "_version" }, { "_panicstr" }, { "_dumpmag" }, { "" }, }; /* Types match kernel declarations. */ long dumplo; /* where dump starts on dumpdev */ int dumpmag; /* magic number in dump */ int dumpsize; /* amount of memory dumped */ char *kernel; char *dirname; /* directory to save dumps in */ char *ddname; /* name of dump device */ dev_t dumpdev; /* dump device */ int dumpfd; /* read/write descriptor on block dev */ time_t now; /* current date */ char panic_mesg[1024]; int panicstr; char vers[1024]; int clear, compress, force, verbose; /* flags */ void check_kmem __P((void)); int check_space __P((void)); void clear_dump __P((void)); int Create __P((char *, int)); int dump_exists __P((void)); char *find_dev __P((dev_t, int)); int get_crashtime __P((void)); void kmem_setup __P((void)); void log __P((int, char *, ...)); void Lseek __P((int, off_t, int)); int Open __P((char *, int rw)); int Read __P((int, void *, int)); char *rawname __P((char *s)); void save_core __P((void)); void usage __P((void)); void Write __P((int, void *, int)); int main(argc, argv) int argc; char *argv[]; { int ch; openlog("savecore", LOG_PERROR, LOG_DAEMON); while ((ch = getopt(argc, argv, "cdfN:vz")) != -1) switch(ch) { case 'c': clear = 1; break; case 'd': /* Not documented. */ case 'v': verbose = 1; break; case 'f': force = 1; break; case 'N': kernel = optarg; break; case 'z': compress = 1; break; case '?': default: usage(); } argc -= optind; argv += optind; if (!clear) { if (argc != 1 && argc != 2) usage(); dirname = argv[0]; } if (argc == 2) kernel = argv[1]; (void)time(&now); kmem_setup(); if (clear) { clear_dump(); exit(0); } if (!dump_exists() && !force) exit(1); check_kmem(); if (panicstr) syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg); else syslog(LOG_ALERT, "reboot"); if ((!get_crashtime() || !check_space()) && !force) exit(1); save_core(); clear_dump(); exit(0); } void kmem_setup() { FILE *fp; int kmem, i; char *dump_sys; /* * Some names we need for the currently running system, others for * the system that was running when the dump was made. The values * obtained from the current system are used to look for things in * /dev/kmem that cannot be found in the dump_sys namelist, but are * presumed to be the same (since the disk partitions are probably * the same!) */ if ((nlist(_PATH_UNIX, current_nl)) == -1) syslog(LOG_ERR, "%s: nlist: %s", _PATH_UNIX, strerror(errno)); for (i = 0; cursyms[i] != -1; i++) if (current_nl[cursyms[i]].n_value == 0) { syslog(LOG_ERR, "%s: %s not in namelist", _PATH_UNIX, current_nl[cursyms[i]].n_name); exit(1); } dump_sys = kernel ? kernel : _PATH_UNIX; if ((nlist(dump_sys, dump_nl)) == -1) syslog(LOG_ERR, "%s: nlist: %s", dump_sys, strerror(errno)); for (i = 0; dumpsyms[i] != -1; i++) if (dump_nl[dumpsyms[i]].n_value == 0) { syslog(LOG_ERR, "%s: %s not in namelist", dump_sys, dump_nl[dumpsyms[i]].n_name); exit(1); } kmem = Open(_PATH_KMEM, O_RDONLY); Lseek(kmem, (off_t)current_nl[X_DUMPDEV].n_value, L_SET); (void)Read(kmem, &dumpdev, sizeof(dumpdev)); if (dumpdev == NODEV) { syslog(LOG_WARNING, "no core dump (no dumpdev)"); exit(1); } Lseek(kmem, (off_t)current_nl[X_DUMPLO].n_value, L_SET); (void)Read(kmem, &dumplo, sizeof(dumplo)); dumplo *= DEV_BSIZE; if (verbose) (void)printf("dumplo = %d (%d * %d)\n", dumplo, dumplo / DEV_BSIZE, DEV_BSIZE); Lseek(kmem, (off_t)current_nl[X_DUMPMAG].n_value, L_SET); (void)Read(kmem, &dumpmag, sizeof(dumpmag)); ddname = find_dev(dumpdev, S_IFBLK); dumpfd = Open(ddname, O_RDWR); fp = fdopen(kmem, "r"); if (fp == NULL) { syslog(LOG_ERR, "%s: fdopen: %m", _PATH_KMEM); exit(1); } if (kernel) return; (void)fseek(fp, (off_t)current_nl[X_VERSION].n_value, L_SET); (void)fgets(vers, sizeof(vers), fp); /* Don't fclose(fp), we use dumpfd later. */ } void check_kmem() { register char *cp; FILE *fp; char core_vers[1024]; fp = fdopen(dumpfd, "r"); if (fp == NULL) { syslog(LOG_ERR, "%s: fdopen: %m", ddname); exit(1); } fseek(fp, (off_t)(dumplo + ok(dump_nl[X_VERSION].n_value)), L_SET); fgets(core_vers, sizeof(core_vers), fp); if (strcmp(vers, core_vers) && kernel == 0) syslog(LOG_WARNING, "warning: %s version mismatch:\n\t%s\nand\t%s\n", _PATH_UNIX, vers, core_vers); (void)fseek(fp, (off_t)(dumplo + ok(dump_nl[X_PANICSTR].n_value)), L_SET); (void)fread(&panicstr, sizeof(panicstr), 1, fp); if (panicstr) { (void)fseek(fp, dumplo + ok(panicstr), L_SET); cp = panic_mesg; do *cp = getc(fp); while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)]); } /* Don't fclose(fp), we use dumpfd later. */ } void clear_dump() { long newdumplo; newdumplo = 0; Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); Write(dumpfd, &newdumplo, sizeof(newdumplo)); } int dump_exists() { int newdumpmag; Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET); (void)Read(dumpfd, &newdumpmag, sizeof(newdumpmag)); /* Read the dump size. */ Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET); (void)Read(dumpfd, &dumpsize, sizeof(dumpsize)); dumpsize *= getpagesize(); /* * Return zero if core dump doesn't seem to be there, and note * it for syslog. This check and return happens after the dump size * is read, so dumpsize is whether or not the core is valid (for -f). */ if (newdumpmag != dumpmag) { if (verbose) syslog(LOG_WARNING, "magic number mismatch (%x != %x)", newdumpmag, dumpmag); syslog(LOG_WARNING, "no core dump"); return (0); } return (1); } char buf[1024 * 1024]; void save_core() { register FILE *fp; register int bounds, ifd, nr, nw, ofd; char *rawp, path[MAXPATHLEN]; /* * Get the current number and update the bounds file. Do the update * now, because may fail later and don't want to overwrite anything. */ (void)snprintf(path, sizeof(path), "%s/bounds", dirname); if ((fp = fopen(path, "r")) == NULL) goto err1; if (fgets(buf, sizeof(buf), fp) == NULL) { if (ferror(fp)) err1: syslog(LOG_WARNING, "%s: %s", path, strerror(errno)); bounds = 0; } else bounds = atoi(buf); if (fp != NULL) (void)fclose(fp); if ((fp = fopen(path, "w")) == NULL) syslog(LOG_ERR, "%s: %m", path); else { (void)fprintf(fp, "%d\n", bounds + 1); (void)fclose(fp); } (void)fclose(fp); /* Create the core file. */ (void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s", dirname, bounds, compress ? ".Z" : ""); if (compress) { if ((fp = zopen(path, "w", 0)) == NULL) { syslog(LOG_ERR, "%s: %s", path, strerror(errno)); exit(1); } } else ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); /* Open the raw device. */ rawp = rawname(ddname); if ((ifd = open(rawp, O_RDONLY)) == -1) { syslog(LOG_WARNING, "%s: %m; using block device", rawp); ifd = dumpfd; } /* Seek to the start of the core. */ Lseek(ifd, (off_t)dumplo, L_SET); /* Copy the core file. */ syslog(LOG_NOTICE, "writing %score to %s", compress ? "compressed " : "", path); for (; dumpsize > 0; dumpsize -= nr) { (void)printf("%6dK\r", dumpsize / 1024); (void)fflush(stdout); nr = read(ifd, buf, MIN(dumpsize, sizeof(buf))); if (nr <= 0) { if (nr == 0) syslog(LOG_WARNING, "WARNING: EOF on dump device"); else syslog(LOG_ERR, "%s: %m", rawp); goto err2; } if (compress) nw = fwrite(buf, 1, nr, fp); else nw = write(ofd, buf, nr); if (nw != nr) { syslog(LOG_ERR, "%s: %s", path, strerror(nw == 0 ? EIO : errno)); err2: syslog(LOG_WARNING, "WARNING: core may be incomplete"); (void)printf("\n"); exit(1); } } (void)close(ifd); if (compress) (void)fclose(fp); else (void)close(ofd); /* Copy the kernel. */ ifd = Open(kernel ? kernel : _PATH_UNIX, O_RDONLY); (void)snprintf(path, sizeof(path), "%s/netbsd.%d%s", dirname, bounds, compress ? ".Z" : ""); if (compress) { if ((fp = zopen(path, "w", 0)) == NULL) { syslog(LOG_ERR, "%s: %s", path, strerror(errno)); exit(1); } } else ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); syslog(LOG_NOTICE, "writing %skernel to %s", compress ? "compressed " : "", path); while ((nr = read(ifd, buf, sizeof(buf))) > 0) { if (compress) nw = fwrite(buf, 1, nr, fp); else nw = write(ofd, buf, nr); if (nw != nr) { syslog(LOG_ERR, "%s: %s", path, strerror(nw == 0 ? EIO : errno)); syslog(LOG_WARNING, "WARNING: kernel may be incomplete"); exit(1); } } if (nr < 0) { syslog(LOG_ERR, "%s: %s", kernel ? kernel : _PATH_UNIX, strerror(errno)); syslog(LOG_WARNING, "WARNING: kernel may be incomplete"); exit(1); } if (compress) (void)fclose(fp); else (void)close(ofd); } char * find_dev(dev, type) register dev_t dev; register int type; { register DIR *dfd; struct dirent *dir; struct stat sb; char *dp, devname[MAXPATHLEN + 1]; if ((dfd = opendir(_PATH_DEV)) == NULL) { syslog(LOG_ERR, "%s: %s", _PATH_DEV, strerror(errno)); exit(1); } (void)strcpy(devname, _PATH_DEV); while ((dir = readdir(dfd))) { (void)strcpy(devname + sizeof(_PATH_DEV) - 1, dir->d_name); if (lstat(devname, &sb)) { syslog(LOG_ERR, "%s: %s", devname, strerror(errno)); continue; } if ((sb.st_mode & S_IFMT) != type) continue; if (dev == sb.st_rdev) { closedir(dfd); if ((dp = strdup(devname)) == NULL) { syslog(LOG_ERR, "%s", strerror(errno)); exit(1); } return (dp); } } closedir(dfd); syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev)); exit(1); } char * rawname(s) char *s; { char *sl, name[MAXPATHLEN]; if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') { syslog(LOG_ERR, "can't make raw dump device name from %s", s); return (s); } (void)snprintf(name, sizeof(name), "%.*s/r%s", sl - s, s, sl + 1); if ((sl = strdup(name)) == NULL) { syslog(LOG_ERR, "%s", strerror(errno)); exit(1); } return (sl); } int get_crashtime() { time_t dumptime; /* Time the dump was taken. */ Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_TIME].n_value)), L_SET); (void)Read(dumpfd, &dumptime, sizeof(dumptime)); if (dumptime == 0) { if (verbose) syslog(LOG_ERR, "dump time is zero"); return (0); } (void)printf("savecore: system went down at %s", ctime(&dumptime)); #define LEEWAY (7 * SECSPERDAY) if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) { (void)printf("dump time is unreasonable\n"); return (0); } return (1); } int check_space() { register FILE *fp; char *tkernel; off_t minfree, spacefree, kernelsize, needed; struct stat st; struct statfs fsbuf; char buf[100], path[MAXPATHLEN]; tkernel = kernel ? kernel : _PATH_UNIX; if (stat(tkernel, &st) < 0) { syslog(LOG_ERR, "%s: %m", tkernel); exit(1); } kernelsize = st.st_blocks * S_BLKSIZE; if (statfs(dirname, &fsbuf) < 0) { syslog(LOG_ERR, "%s: %m", dirname); exit(1); } spacefree = (fsbuf.f_bavail * fsbuf.f_bsize) / 1024; (void)snprintf(path, sizeof(path), "%s/minfree", dirname); if ((fp = fopen(path, "r")) == NULL) minfree = 0; else { if (fgets(buf, sizeof(buf), fp) == NULL) minfree = 0; else minfree = atoi(buf); (void)fclose(fp); } needed = (dumpsize + kernelsize) / 1024; if (minfree > 0 && spacefree - needed < minfree) { syslog(LOG_WARNING, "no dump, not enough free space on device"); return (0); } if (spacefree - needed < minfree) syslog(LOG_WARNING, "dump performed, but free space threshold crossed"); return (1); } int Open(name, rw) char *name; int rw; { int fd; if ((fd = open(name, rw, 0)) < 0) { syslog(LOG_ERR, "%s: %m", name); exit(1); } return (fd); } int Read(fd, bp, size) int fd, size; void *bp; { int nr; nr = read(fd, bp, size); if (nr != size) { syslog(LOG_ERR, "read: %m"); exit(1); } return (nr); } void Lseek(fd, off, flag) int fd, flag; off_t off; { off_t ret; ret = lseek(fd, off, flag); if (ret == -1) { syslog(LOG_ERR, "lseek: %m"); exit(1); } } int Create(file, mode) char *file; int mode; { register int fd; fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode); if (fd < 0) { syslog(LOG_ERR, "%s: %m", file); exit(1); } return (fd); } void Write(fd, bp, size) int fd, size; void *bp; { int n; if ((n = write(fd, bp, size)) < size) { syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO)); exit(1); } } void usage() { (void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory"); exit(1); }