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382 lines
9.8 KiB
382 lines
9.8 KiB
/* Standard argp argument parsers for tools using libdwfl.
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Copyright (C) 2005-2010, 2012, 2015 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libdwflP.h"
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#include <argp.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <libintl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define OPT_DEBUGINFO 0x100
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#define OPT_COREFILE 0x101
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static const struct argp_option options[] =
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{
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{ NULL, 0, NULL, 0, N_("Input selection options:"), 0 },
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{ "executable", 'e', "FILE", 0, N_("Find addresses in FILE"), 0 },
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{ "core", OPT_COREFILE, "COREFILE", 0,
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N_("Find addresses from signatures found in COREFILE"), 0 },
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{ "pid", 'p', "PID", 0,
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N_("Find addresses in files mapped into process PID"), 0 },
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{ "linux-process-map", 'M', "FILE", 0,
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N_("Find addresses in files mapped as read from FILE"
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" in Linux /proc/PID/maps format"), 0 },
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{ "kernel", 'k', NULL, 0, N_("Find addresses in the running kernel"), 0 },
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{ "offline-kernel", 'K', "RELEASE", OPTION_ARG_OPTIONAL,
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N_("Kernel with all modules"), 0 },
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{ "debuginfo-path", OPT_DEBUGINFO, "PATH", 0,
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N_("Search path for separate debuginfo files"), 0 },
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{ NULL, 0, NULL, 0, NULL, 0 }
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};
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static char *debuginfo_path;
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static const Dwfl_Callbacks offline_callbacks =
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{
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.find_debuginfo = INTUSE(dwfl_standard_find_debuginfo),
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.debuginfo_path = &debuginfo_path,
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.section_address = INTUSE(dwfl_offline_section_address),
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/* We use this table for core files too. */
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.find_elf = INTUSE(dwfl_build_id_find_elf),
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};
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static const Dwfl_Callbacks proc_callbacks =
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{
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.find_debuginfo = INTUSE(dwfl_standard_find_debuginfo),
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.debuginfo_path = &debuginfo_path,
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.find_elf = INTUSE(dwfl_linux_proc_find_elf),
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};
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static const Dwfl_Callbacks kernel_callbacks =
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{
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.find_debuginfo = INTUSE(dwfl_standard_find_debuginfo),
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.debuginfo_path = &debuginfo_path,
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.find_elf = INTUSE(dwfl_linux_kernel_find_elf),
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.section_address = INTUSE(dwfl_linux_kernel_module_section_address),
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};
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/* Structure held at state->HOOK. */
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struct parse_opt
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{
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Dwfl *dwfl;
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/* The -e|--executable parameter. */
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const char *e;
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/* The --core parameter. */
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const char *core;
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};
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static inline void
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failure (Dwfl *dwfl, int errnum, const char *msg, struct argp_state *state)
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{
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if (dwfl != NULL)
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dwfl_end (dwfl);
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if (errnum == -1)
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argp_failure (state, EXIT_FAILURE, 0, "%s: %s",
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msg, INTUSE(dwfl_errmsg) (-1));
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else
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argp_failure (state, EXIT_FAILURE, errnum, "%s", msg);
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}
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static inline error_t
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fail (Dwfl *dwfl, int errnum, const char *msg, struct argp_state *state)
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{
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failure (dwfl, errnum, msg, state);
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return errnum == -1 ? EIO : errnum;
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}
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static error_t
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parse_opt (int key, char *arg, struct argp_state *state)
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{
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switch (key)
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{
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case ARGP_KEY_INIT:
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{
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assert (state->hook == NULL);
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struct parse_opt *opt = calloc (1, sizeof (*opt));
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if (opt == NULL)
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failure (NULL, DWFL_E_ERRNO, "calloc", state);
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state->hook = opt;
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}
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break;
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case OPT_DEBUGINFO:
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debuginfo_path = arg;
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break;
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case 'e':
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{
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struct parse_opt *opt = state->hook;
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Dwfl *dwfl = opt->dwfl;
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if (dwfl == NULL)
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{
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dwfl = INTUSE(dwfl_begin) (&offline_callbacks);
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if (dwfl == NULL)
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return fail (dwfl, -1, arg, state);
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opt->dwfl = dwfl;
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/* Start at zero so if there is just one -e foo.so,
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the DSO is shown without address bias. */
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dwfl->offline_next_address = 0;
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}
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if (dwfl->callbacks != &offline_callbacks)
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{
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toomany:
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argp_error (state, "%s",
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_("only one of -e, -p, -k, -K, or --core allowed"));
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return EINVAL;
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}
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opt->e = arg;
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}
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break;
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case 'p':
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{
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struct parse_opt *opt = state->hook;
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if (opt->dwfl == NULL)
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{
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Dwfl *dwfl = INTUSE(dwfl_begin) (&proc_callbacks);
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int result = INTUSE(dwfl_linux_proc_report) (dwfl, atoi (arg));
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if (result != 0)
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return fail (dwfl, result, arg, state);
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/* Non-fatal to not be able to attach to process, ignore error. */
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INTUSE(dwfl_linux_proc_attach) (dwfl, atoi (arg), false);
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opt->dwfl = dwfl;
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}
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else
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goto toomany;
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}
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break;
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case 'M':
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{
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struct parse_opt *opt = state->hook;
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if (opt->dwfl == NULL)
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{
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FILE *f = fopen (arg, "r");
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if (f == NULL)
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{
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int code = errno;
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argp_failure (state, EXIT_FAILURE, code,
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"cannot open '%s'", arg);
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return code;
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}
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Dwfl *dwfl = INTUSE(dwfl_begin) (&proc_callbacks);
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int result = INTUSE(dwfl_linux_proc_maps_report) (dwfl, f);
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fclose (f);
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if (result != 0)
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return fail (dwfl, result, arg, state);
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opt->dwfl = dwfl;
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}
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else
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goto toomany;
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}
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break;
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case OPT_COREFILE:
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{
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struct parse_opt *opt = state->hook;
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Dwfl *dwfl = opt->dwfl;
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if (dwfl == NULL)
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opt->dwfl = dwfl = INTUSE(dwfl_begin) (&offline_callbacks);
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/* Permit -e and --core together. */
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else if (dwfl->callbacks != &offline_callbacks)
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goto toomany;
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opt->core = arg;
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}
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break;
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case 'k':
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{
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struct parse_opt *opt = state->hook;
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if (opt->dwfl == NULL)
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{
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Dwfl *dwfl = INTUSE(dwfl_begin) (&kernel_callbacks);
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int result = INTUSE(dwfl_linux_kernel_report_kernel) (dwfl);
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if (result != 0)
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return fail (dwfl, result, _("cannot load kernel symbols"), state);
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result = INTUSE(dwfl_linux_kernel_report_modules) (dwfl);
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if (result != 0)
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/* Non-fatal to have no modules since we do have the kernel. */
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argp_failure (state, 0, result, _("cannot find kernel modules"));
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opt->dwfl = dwfl;
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}
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else
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goto toomany;
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}
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break;
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case 'K':
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{
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struct parse_opt *opt = state->hook;
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if (opt->dwfl == NULL)
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{
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Dwfl *dwfl = INTUSE(dwfl_begin) (&offline_callbacks);
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int result = INTUSE(dwfl_linux_kernel_report_offline) (dwfl, arg,
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NULL);
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if (result != 0)
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return fail (dwfl, result, _("cannot find kernel or modules"), state);
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opt->dwfl = dwfl;
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}
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else
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goto toomany;
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}
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break;
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case ARGP_KEY_SUCCESS:
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{
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struct parse_opt *opt = state->hook;
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Dwfl *dwfl = opt->dwfl;
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if (dwfl == NULL)
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{
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/* Default if no -e, -p, or -k, is "-e a.out". */
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arg = "a.out";
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dwfl = INTUSE(dwfl_begin) (&offline_callbacks);
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if (INTUSE(dwfl_report_offline) (dwfl, "", arg, -1) == NULL)
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return fail (dwfl, -1, arg, state);
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opt->dwfl = dwfl;
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}
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if (opt->core)
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{
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int fd = open (opt->core, O_RDONLY);
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if (fd < 0)
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{
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int code = errno;
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argp_failure (state, EXIT_FAILURE, code,
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"cannot open '%s'", opt->core);
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return code;
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}
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Elf *core;
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Dwfl_Error error = __libdw_open_file (&fd, &core, true, false);
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if (error != DWFL_E_NOERROR)
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{
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argp_failure (state, EXIT_FAILURE, 0,
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_("cannot read ELF core file: %s"),
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INTUSE(dwfl_errmsg) (error));
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return error == DWFL_E_ERRNO ? errno : EIO;
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}
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int result = INTUSE(dwfl_core_file_report) (dwfl, core, opt->e);
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if (result < 0)
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{
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elf_end (core);
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close (fd);
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return fail (dwfl, result, opt->core, state);
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}
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/* Non-fatal to not be able to attach to core, ignore error. */
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INTUSE(dwfl_core_file_attach) (dwfl, core);
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/* Store core Elf and fd in Dwfl to expose with dwfl_end. */
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if (dwfl->user_core == NULL)
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{
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dwfl->user_core = calloc (1, sizeof (struct Dwfl_User_Core));
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if (dwfl->user_core == NULL)
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{
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argp_failure (state, EXIT_FAILURE, 0,
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_("Not enough memory"));
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return ENOMEM;
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}
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}
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dwfl->user_core->core = core;
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dwfl->user_core->fd = fd;
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if (result == 0)
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{
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argp_failure (state, EXIT_FAILURE, 0,
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_("No modules recognized in core file"));
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return ENOENT;
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}
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}
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else if (opt->e)
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{
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if (INTUSE(dwfl_report_offline) (dwfl, "", opt->e, -1) == NULL)
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return fail (dwfl, -1, opt->e, state);
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}
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/* One of the three flavors has done dwfl_begin and some reporting
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if we got here. Tie up the Dwfl and return it to the caller of
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argp_parse. */
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int result = INTUSE(dwfl_report_end) (dwfl, NULL, NULL);
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if (result != 0)
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return fail (dwfl, -1, arg, state);
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/* Update the input all along, so a parent parser can see it.
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As we free OPT the update below will be no longer active. */
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*(Dwfl **) state->input = dwfl;
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free (opt);
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state->hook = NULL;
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}
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break;
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case ARGP_KEY_ERROR:
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{
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struct parse_opt *opt = state->hook;
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dwfl_end (opt->dwfl);
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free (opt);
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state->hook = NULL;
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}
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break;
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default:
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return ARGP_ERR_UNKNOWN;
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}
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/* Update the input all along, so a parent parser can see it. */
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struct parse_opt *opt = state->hook;
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if (opt)
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*(Dwfl **) state->input = opt->dwfl;
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return 0;
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}
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static const struct argp libdwfl_argp =
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{ .options = options, .parser = parse_opt };
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const struct argp *
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dwfl_standard_argp (void)
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{
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return &libdwfl_argp;
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}
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