/*
* Copyright (C) 2018 ABRT team
* Copyright (C) 2018 RedHat Inc
*
* 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.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#define INIT_PROC_STDERR_FD_PATH "/proc/1/fd/2"
#define DEFAULT_TAG "container-exception-logger"
int main(int argc, char *argv[])
{
const char *program_usage_string =
"Usage: abrt-container-logger [--no-tag | --tag STRING | --help]"
"\n"
"\nThe tool reads from standard input and writes to '"INIT_PROC_STDERR_FD_PATH"'";
int opt_notag = 0;
const char * opt_tag = NULL;
if (argc > 1)
{
for (int i = 1; i < argc; ++i)
{
if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0)
{
fprintf(stderr, "%s\n", program_usage_string);
return 1;
}
else if (strcmp(argv[i], "--no-tag") == 0)
{
opt_notag = 1;
}
else if (strcmp(argv[i], "--tag") == 0
&& i + 1 < argc
&& argv[i + 1][0] != '-')
{
opt_tag = argv[++i];
}
else
{
fprintf(stderr, "%s\n", program_usage_string);
return 1;
}
}
}
FILE *f = fopen(INIT_PROC_STDERR_FD_PATH, "w");
if (f == NULL)
{
perror("Failed to open '"INIT_PROC_STDERR_FD_PATH"' as root");
/* Try to open the 'INIT_PROC_STDERR_FD_PATH' as normal user because of
https://github.com/minishift/minishift/issues/2058
*/
if (seteuid(getuid()) == 0)
{
f = fopen(INIT_PROC_STDERR_FD_PATH, "w");
if (f == NULL)
{
perror("Failed to open '"INIT_PROC_STDERR_FD_PATH"' as user");
return 2;
}
}
else
{
perror("Failed to setuid");
return 3;
}
}
setvbuf (f, NULL, _IONBF, 0);
if (!opt_notag)
fprintf(f, "%s - ", opt_tag ? opt_tag : DEFAULT_TAG);
char buffer[BUFSIZ];
ssize_t bytes_read = 0;
while (1)
{
bytes_read = read(0, buffer, sizeof buffer);
if (bytes_read <= 0)
break;
if (fwrite(buffer, bytes_read, 1, f) != 1)
{
perror("Failed to write to '"INIT_PROC_STDERR_FD_PATH"'");
fclose(f);
return 4;
}
}
fclose(f);
return 0;
}