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/* Command-line frontend for retrieving ELF / DWARF / source files
from the debuginfod.
Copyright (C) 2019-2020 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "config.h"
#include "printversion.h"
#include "debuginfod.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <argp.h>
#include <unistd.h>
#include <fcntl.h>
#include <gelf.h>
#include <libdwelf.h>
/* Name and version of program. */
ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
/* Bug report address. */
ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
/* Short description of program. */
static const char doc[] = N_("Request debuginfo-related content "
"from debuginfods listed in $" DEBUGINFOD_URLS_ENV_VAR ".");
/* Strings for arguments in help texts. */
static const char args_doc[] = N_("debuginfo BUILDID\n"
"debuginfo PATH\n"
"executable BUILDID\n"
"executable PATH\n"
"source BUILDID /FILENAME\n"
"source PATH /FILENAME\n");
/* Definitions of arguments for argp functions. */
static const struct argp_option options[] =
{
{ "verbose", 'v', NULL, 0, "Increase verbosity.", 0 },
{ NULL, 0, NULL, 0, NULL, 0 }
};
/* debuginfod connection handle. */
static debuginfod_client *client;
static int verbose;
int progressfn(debuginfod_client *c __attribute__((__unused__)),
long a, long b)
{
static bool first = true;
static struct timespec last;
struct timespec now;
uint64_t delta;
if (!first)
{
clock_gettime (CLOCK_MONOTONIC, &now);
delta = ((now.tv_sec - last.tv_sec) * 1000000
+ (now.tv_nsec - last.tv_nsec) / 1000);
}
else
{
first = false;
delta = 250000;
}
/* Show progress the first time and then at most 5 times a second. */
if (delta > 200000)
{
fprintf (stderr, "Progress %ld / %ld\n", a, b);
clock_gettime (CLOCK_MONOTONIC, &last);
}
return 0;
}
static error_t parse_opt (int key, char *arg, struct argp_state *state)
{
(void) arg;
(void) state;
switch (key)
{
case 'v': verbose++;
debuginfod_set_progressfn (client, & progressfn);
debuginfod_set_verbose_fd (client, STDERR_FILENO);
break;
default: return ARGP_ERR_UNKNOWN;
}
return 0;
}
/* Data structure to communicate with argp functions. */
static struct argp argp =
{
options, parse_opt, args_doc, doc, NULL, NULL, NULL
};
int
main(int argc, char** argv)
{
elf_version (EV_CURRENT);
client = debuginfod_begin ();
if (client == NULL)
{
fprintf(stderr, "Couldn't create debuginfod client context\n");
return 1;
}
/* Exercise user data pointer, to support testing only. */
debuginfod_set_user_data (client, (void *)"Progress");
int remaining;
(void) argp_parse (&argp, argc, argv, ARGP_IN_ORDER|ARGP_NO_ARGS, &remaining, NULL);
if (argc < 2 || remaining+1 == argc) /* no arguments or at least two non-option words */
{
argp_help (&argp, stderr, ARGP_HELP_USAGE, argv[0]);
return 1;
}
/* If we were passed an ELF file name in the BUILDID slot, look in there. */
unsigned char* build_id = (unsigned char*) argv[remaining+1];
int build_id_len = 0; /* assume text */
int any_non_hex = 0;
int i;
for (i = 0; build_id[i] != '\0'; i++)
if ((build_id[i] >= '0' && build_id[i] <= '9') ||
(build_id[i] >= 'a' && build_id[i] <= 'f'))
;
else
any_non_hex = 1;
int fd = -1;
Elf* elf = NULL;
if (any_non_hex) /* raw build-id */
{
fd = open ((char*) build_id, O_RDONLY);
if (fd < 0)
fprintf (stderr, "Cannot open %s: %s\n", build_id, strerror(errno));
}
if (fd >= 0)
{
elf = dwelf_elf_begin (fd);
if (elf == NULL)
fprintf (stderr, "Cannot open as ELF file %s: %s\n", build_id,
elf_errmsg (-1));
}
if (elf != NULL)
{
const void *extracted_build_id;
ssize_t s = dwelf_elf_gnu_build_id(elf, &extracted_build_id);
if (s > 0)
{
/* Success: replace the build_id pointer/len with the binary blob
that elfutils is keeping for us. It'll remain valid until elf_end(). */
build_id = (unsigned char*) extracted_build_id;
build_id_len = s;
}
else
fprintf (stderr, "Cannot extract build-id from %s: %s\n", build_id, elf_errmsg(-1));
}
char *cache_name;
int rc = 0;
/* Check whether FILETYPE is valid and call the appropriate
debuginfod_find_* function. If FILETYPE is "source"
then ensure a FILENAME was also supplied as an argument. */
if (strcmp(argv[remaining], "debuginfo") == 0)
rc = debuginfod_find_debuginfo(client,
build_id, build_id_len,
&cache_name);
else if (strcmp(argv[remaining], "executable") == 0)
rc = debuginfod_find_executable(client,
build_id, build_id_len,
&cache_name);
else if (strcmp(argv[remaining], "source") == 0)
{
if (remaining+2 == argc || argv[remaining+2][0] != '/')
{
fprintf(stderr, "If FILETYPE is \"source\" then absolute /FILENAME must be given\n");
return 1;
}
rc = debuginfod_find_source(client,
build_id, build_id_len,
argv[remaining+2], &cache_name);
}
else
{
argp_help (&argp, stderr, ARGP_HELP_USAGE, argv[0]);
return 1;
}
if (verbose)
{
const char* url = debuginfod_get_url (client);
if (url != NULL)
fprintf(stderr, "Downloaded from %s\n", url);
}
debuginfod_end (client);
if (elf)
elf_end(elf);
if (fd >= 0)
close (fd);
if (rc < 0)
{
fprintf(stderr, "Server query failed: %s\n", strerror(-rc));
return 1;
}
printf("%s\n", cache_name);
free (cache_name);
return 0;
}
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