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0e4e809602
The improvements are: - can get the kld info from core files via kvm(3); - can use kldstat(2) directly, which is a piece of cake; - can use .symbols or whatever, which allows for use by non-developers when reporting system crashes -- now asf(8) can be mentioned in the handbook at last; - speed (no more double fts(3) per loaded module); - various bugs fixed. At the same time, the new asf(8) should stay compatible with the old one, bar bugs. Perhaps some defaults may be changed later to match today's state of affairs. Reviewed by: grog MFC after: 1 month Sponsored by: RiNet (Cronyx Plus LLC)
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*-
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* Copyright (c) 2006 The FreeBSD Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/queue.h> /* for <sys/linker.h> with _KERNEL defined */
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#include <err.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <nlist.h>
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#include <stdlib.h>
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#include <string.h>
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#define _KERNEL
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#include <sys/linker.h>
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#undef _KERNEL
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#include "asf.h"
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/* Name of the head of the linker file list in /sys/kern/kern_linker.c */
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#define LINKER_HEAD "linker_files"
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/*
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* Get the list of linker files using kvm(3).
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* Can work with a live kernel as well as with a crash dump.
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*/
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void
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asf_kvm(const char *kernfile, const char *corefile)
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{
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char errbuf[LINE_MAX];
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char name[PATH_MAX];
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kvm_t *kd;
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struct nlist nl[2];
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struct linker_file lf;
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linker_file_list_t linker_files;
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ssize_t n;
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void *kp;
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kd = kvm_openfiles(kernfile, corefile, NULL, O_RDONLY, errbuf);
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if (kd == NULL)
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errx(2, "open kernel memory: %s", errbuf);
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/*
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* Locate the head of the linker file list using kernel symbols.
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*/
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strcpy(name, LINKER_HEAD);
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nl[0].n_name = name; /* can't use LINKER_HEAD here because it's const */
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nl[1].n_name = NULL; /* terminate the array for kvm_nlist() */
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switch (kvm_nlist(kd, nl)) {
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case 0:
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break;
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case -1:
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warnx("%s: %s", LINKER_HEAD, kvm_geterr(kd));
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kvm_close(kd);
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exit(2);
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default:
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kvm_close(kd);
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errx(2, "%s: symbol not found", LINKER_HEAD);
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}
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/*
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* Read the head of the linker file list from kernel memory.
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*/
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n = kvm_read(kd, nl[0].n_value, &linker_files, sizeof(linker_files));
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if (n == -1)
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goto read_err;
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if (n != sizeof(linker_files)) {
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kvm_close(kd);
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errx(2, "%s: short read", LINKER_HEAD);
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}
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/*
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* Traverse the linker file list starting at its head.
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*/
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for (kp = linker_files.tqh_first; kp; kp = lf.link.tqe_next) {
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/* Read a linker file structure */
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n = kvm_read(kd, (u_long)kp, &lf, sizeof(lf));
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if (n == -1)
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goto read_err;
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if (n != sizeof(lf)) {
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kvm_close(kd);
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errx(2, "kvm: short read");
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}
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/* Read the name of the file stored separately */
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bzero(name, sizeof(name));
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n = kvm_read(kd, (u_long)lf.filename, name, sizeof(name) - 1);
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if (n == -1)
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goto read_err;
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if (strcmp(name, KERNFILE) == 0)
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continue;
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/* Add this file to our list of linker files */
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kfile_add(name, lf.address);
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}
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kvm_close(kd);
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return;
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read_err: /* A common error case */
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warnx("read kernel memory: %s", kvm_geterr(kd));
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kvm_close(kd);
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exit(2);
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}
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