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/*
Copyright (C) 2008, 2009 Jiri Olsa <olsajiri@gmail.com>
This file is part of the latrace.
The latrace 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.
The latrace 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 the latrace (file COPYING). If not, see
<http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include "config.h"
struct lt_config_audit cfg;
static int read_config(char *dir)
{
int fd;
off_t len;
char file[LT_MAXFILE];
memset(&cfg, 0, sizeof(cfg));
cfg.dir = dir;
sprintf(file, "%s/config", dir);
if (-1 == (fd = open(file, O_RDONLY))) {
perror("open failed");
return -1;
}
if (-1 == read(fd, &cfg.sh, sizeof(cfg.sh))) {
perror("read failed");
return -1;
}
if (-1 == (len = lseek(fd, 0, SEEK_END))) {
perror("lseek failed");
return -1;
}
if (len != sizeof(cfg.sh)) {
printf("config file size differs\n");
return -1;
}
if (LT_MAGIC != cfg.sh.magic) {
printf("config file magic check failed\n");
return -1;
}
return 0;
}
static int get_names(struct lt_config_audit *cfg, char *names, char **ptr)
{
char* s;
int cnt = 0;
PRINT_VERBOSE(cfg->sh.verbose, 1, "names: [%s] max: %d\n",
names, LT_NAMES_MAX);
s = strchr(names, LT_NAMES_SEP);
while(NULL != (s = strchr(names, LT_NAMES_SEP)) && (cnt < LT_NAMES_MAX)) {
*s = 0x0;
PRINT_VERBOSE(cfg->sh.verbose, 1, "got: %s", names);
ptr[cnt++] = names;
names = ++s;
}
if (cnt) {
ptr[cnt++] = names;
PRINT_VERBOSE(cfg->sh.verbose, 1, "got: %s\n", names);
}
if (!cnt && *names) {
ptr[0] = names;
cnt = 1;
PRINT_VERBOSE(cfg->sh.verbose, 1, "got: %s\n", names);
}
ptr[cnt] = NULL;
if (!cnt)
return -1;
PRINT_VERBOSE(cfg->sh.verbose, 1, "got %d entries\n", cnt);
return cnt;
}
int audit_init(int argc, char **argv, char **env)
{
if (-1 == read_config(getenv("LT_DIR")))
return -1;
/* -Aa */
if (cfg.sh.args_enabled && lt_args_init(&cfg.sh))
return -1;
/* -t */
if ((*cfg.sh.libs_to) &&
(-1 == (cfg.libs_to_cnt = get_names(&cfg, cfg.sh.libs_to, cfg.libs_to)))) {
printf("latrace failed to parse libs to\n");
return -1;
}
/* -f */
if ((*cfg.sh.libs_from) &&
(-1 == (cfg.libs_from_cnt = get_names(&cfg, cfg.sh.libs_from, cfg.libs_from)))) {
printf("latrace failed to parse libs from\n");
return -1;
}
/* -l */
if ((*cfg.sh.libs_both) &&
(-1 == (cfg.libs_both_cnt = get_names(&cfg, cfg.sh.libs_both, cfg.libs_both)))) {
printf("latrace failed to parse libs from\n");
return -1;
}
/* -s */
if ((*cfg.sh.symbols) &&
(-1 == (cfg.symbols_cnt = get_names(&cfg, cfg.sh.symbols, cfg.symbols)))) {
printf("latrace failed to parse symbols\n");
return -1;
}
/* -b */
if ((*cfg.sh.flow_below) &&
(-1 == (cfg.flow_below_cnt = get_names(&cfg, cfg.sh.flow_below, cfg.flow_below)))) {
printf("latrace failed to parse symbols in flow-below option\n");
return -1;
}
/* -L */
if (*cfg.sh.libs_subst) {
char *ptr[LT_NAMES_MAX];
int cnt;
if (-1 == (cnt = get_names(&cfg, cfg.sh.libs_subst, ptr))) {
printf("latrace failed to parse input for subst option\n");
return -1;
}
if (-1 == lt_objsearch_init(&cfg, ptr, cnt)) {
printf("latrace failed to nitialize subst option\n");
return -1;
}
}
/* -o */
cfg.sh.fout = stdout;
if ((*cfg.sh.output) && (NULL == (cfg.sh.fout = fopen(cfg.sh.output, "w")))) {
printf("latrace failed to open output file %s\n", cfg.sh.output);
return -1;
}
/* -E */
if (cfg.sh.not_follow_exec)
unsetenv("LD_AUDIT");
/* -F */
if (cfg.sh.not_follow_fork)
cfg.sh.pid = getpid();
cfg.init_ok = 1;
return 0;
}
void finalize(void) __attribute__((destructor));
void
finalize(void)
{
if ((!cfg.sh.pipe) && (*cfg.sh.output))
fclose(cfg.sh.fout);
}
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