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/*
* Copyright (C) 2014-2021 Firejail Authors
*
* This file is part of firejail project
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "firejail.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#define MAXBUF 4098
typedef struct fs_msg_t {
struct fs_msg_t *next;
char *msg;
} FsMsg;
static FsMsg *head = NULL;
static inline FsMsg *newmsg(void) {
FsMsg *ptr = malloc(sizeof(FsMsg));
if (!ptr)
errExit("malloc");
memset(ptr, 0, sizeof(FsMsg));
return ptr;
}
static inline void insertmsg(FsMsg *ptr) {
static FsMsg *last = NULL;
if (head == NULL) {
head = ptr;
last = ptr;
return;
}
assert(last);
last->next = ptr;
last = ptr;
}
void fs_logger(const char *msg) {
FsMsg *ptr = newmsg();
ptr->msg = strdup(msg);
if (!ptr->msg)
errExit("strdup");
insertmsg(ptr);
}
void fs_logger2(const char *msg1, const char *msg2) {
FsMsg *ptr = newmsg();
char *str;
if (asprintf(&str, "%s %s", msg1, msg2) == -1)
errExit("asprintf");
ptr->msg = str;
insertmsg(ptr);
}
void fs_logger2int(const char *msg1, int d) {
FsMsg *ptr = newmsg();
char *str;
if (asprintf(&str, "%s %d", msg1, d) == -1)
errExit("asprintf");
ptr->msg = str;
insertmsg(ptr);
}
void fs_logger3(const char *msg1, const char *msg2, const char *msg3) {
FsMsg *ptr = newmsg();
char *str;
if (asprintf(&str, "%s %s %s", msg1, msg2, msg3) == -1)
errExit("asprintf");
ptr->msg = str;
insertmsg(ptr);
}
void fs_logger_print(void) {
if (!head)
return;
FILE *fp = fopen(RUN_FSLOGGER_FILE, "ae");
if (!fp) {
perror("fopen");
return;
}
SET_PERMS_STREAM_NOERR(fp, getuid(), getgid(), 0644);
FsMsg *ptr = head;
while (ptr) {
fprintf(fp, "%s\n", ptr->msg);
FsMsg *next = ptr->next;
// remove message
free(ptr->msg);
free(ptr);
ptr = next;
}
head = NULL;
fclose(fp);
}
void fs_logger_change_owner(void) {
if (chown(RUN_FSLOGGER_FILE, 0, 0) == -1)
errExit("chown");
}
void fs_logger_print_log(pid_t pid) {
EUID_ASSERT();
// in case the pid is that of a firejail process, use the pid of the first child process
pid = switch_to_child(pid);
// exit if no permission to join the sandbox
check_join_permission(pid);
// print RUN_FSLOGGER_FILE
char *fname;
if (asprintf(&fname, "/proc/%d/root%s", pid, RUN_FSLOGGER_FILE) == -1)
errExit("asprintf");
EUID_ROOT();
FILE *fp = fopen(fname, "re");
free(fname);
if (!fp) {
fprintf(stderr, "Error: Cannot open filesystem log\n");
exit(1);
}
char buf[MAXBUF];
while (fgets(buf, MAXBUF, fp))
printf("%s", buf);
fclose(fp);
exit(0);
}
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