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#define _GNU_SOURCE
/*
* Core dump watcher & collector
*
* (C) 2009 Intel Corporation
*
* This program 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; version 3 of the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <glib.h>
#include "corewatcher.h"
/* Attempt to find a file which would match the path/file fragment and
* possibly represent a system binary. We'll get more checking later when
* we call gdb. This is just a best effort candidate executable file to
* hand to gdb along with a core. */
char *find_apppath(char *fragment)
{
char *path = "/usr/bin"; /* ':' sep'd system path */
char *c1, *c2;
char *filename = NULL;
char *candidate = NULL;
char *apppath = NULL;
int stripped = 0;
fprintf(stderr, "+ Looking for %s\n", fragment);
/* explicit absolute path in the standard directory */
if (!strncmp(fragment, "/usr/bin", 8)) {
if (!access(fragment, X_OK)) {
fprintf(stderr, "+ found system executable %s\n", fragment);
return strdup(fragment);
}
fprintf(stderr, "+ can't access system executable %s\n", fragment);
return NULL;
}
/* explicit absolute path not in the standard directory */
if (!strncmp(fragment, "/", 1)) {
fprintf(stderr, "+ bad absolute path %s\n", fragment);
return NULL;
}
/* relative path: problematic as we cannot at this point know the
* $PATH from the environment when the crash'd program started */
if (strchr(fragment, '/')) {
candidate = strip_directories(fragment);
fprintf(stderr, "+ stripped %s to %s\n", fragment, candidate);
if (candidate == NULL)
return NULL;
stripped = 1;
} else {
/* fragment is just an executable's name */
candidate = fragment;
}
/* search the path */
c1 = path;
while (c1 && strlen(c1)>0) {
free(filename);
filename = NULL;
c2 = strchr(c1, ':');
if (c2) *c2=0;
fprintf(stderr, "+ looking in %s\n", c1);
if(asprintf(&filename, "%s/%s", c1, candidate) == -1) {
apppath = NULL;
free(filename);
goto out;
}
if (!access(filename, X_OK)) {
printf("+ found %s\n", filename);
apppath = filename;
goto out;
}
c1 = c2;
if (c2) c1++;
}
out:
if (stripped)
free(candidate);
return apppath;
}
char *find_causingapp(char *fullpath)
{
char *line = NULL, *line_len = NULL, *c = NULL, *c2 = NULL;
size_t size = 0;
FILE *file = NULL;
char *app = NULL, *command = NULL;
if (asprintf(&command, "eu-readelf -n '%s'", fullpath) == -1)
return NULL;
file = popen(command, "r");
if (!file) {
free(command);
return NULL;
}
free(command);
while (!feof(file)) {
if (getline(&line, &size, file) == -1)
break;
/* lines 4 chars and under won't have information we need */
if (size < 5)
continue;
line_len = line + size;
c = strstr(line,"psargs: ");
if (c) {
c += 8;
if (c < line_len) {
c2 = strchr(c, ' ');
if (c2)
*c2 = 0;
c2 = strchr(c, '\n');
if (c2)
*c2 = 0;
app = strdup(c);
fprintf(stderr,"+ causing app: %s\n", app);
}
}
c = strstr(line, "EUID: ");
if (c) {
c += 6;
if (c < line_len) {
int uid;
sscanf(c, "%i", &uid);
fprintf(stderr, "+ uid: %d\n", uid);
}
}
c = strstr(line, "cursig: ");
if (c) {
c += 8;
if (c < line_len) {
int sig;
sscanf(c, "%i", &sig);
fprintf(stderr, "+ sig: %d\n", sig);
}
}
}
pclose(file);
free(line);
return app;
}
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