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/*
* Copyright (c) 2013 RIPE NCC <atlas@ripe.net>
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
* condmv.c -- move a file only if the destination doesn't exist
*/
#include "libbb.h"
#include "eperd.h"
#define SAFE_PREFIX_FROM ATLAS_DATA_NEW
#define SAFE_PREFIX_TO ATLAS_DATA_OUT
#define A_FLAG (1 << 0)
#define F_FLAG (1 << 1)
#define DEFAULT_INTERVAL 60
struct condmvstate
{
char *from;
char *to;
char *atlas;
int force;
int interval;
};
static void *condmv_init(int argc, char *argv[],
void (*done)(void *state) UNUSED_PARAM)
{
char *opt_add, *opt_interval, *from, *to, *check;
int interval;
uint32_t opt;
struct condmvstate *state;
opt_add= NULL;
opt_interval= NULL;
opt_complementary= NULL; /* For when we are called by crond */
opt= getopt32(argv, "!A:fi:", &opt_add, &opt_interval);
if (opt == (uint32_t)-1)
return NULL;
if (argc != optind + 2)
{
crondlog(LVL8 "too many or too few arguments (required 2)");
return NULL;
}
if (opt_interval)
{
interval= strtoul(opt_interval, &check, 0);
if (interval <= 0)
{
crondlog(LVL8 "unable to parse interval '%s'",
opt_interval);
return NULL;
}
}
else
interval= DEFAULT_INTERVAL;
from= argv[optind];
to= argv[optind+1];
if (!validate_filename(from, SAFE_PREFIX_FROM))
{
fprintf(stderr, "insecure from file '%s'\n", from);
return NULL;
}
if (!validate_filename(to, SAFE_PREFIX_TO))
{
fprintf(stderr, "insecure to file '%s'\n", to);
return NULL;
}
state= malloc(sizeof(*state));
state->from= strdup(from);
state->to= strdup(to);
state->atlas= opt_add ? strdup(opt_add) : NULL;
state->force= !!(opt & F_FLAG);
state->interval= interval;
return state;
}
static void condmv_start(void *state)
{
size_t len;
time_t mytime;
char *to;
FILE *file;
struct condmvstate *condmvstate;
struct stat sb;
condmvstate= state;
len= strlen(condmvstate->to) + 20;
to= malloc(len);
snprintf(to, len, "%s.%ld", condmvstate->to,
(long)time(NULL)/condmvstate->interval);
crondlog(LVL7 "condmv_start: destination '%s'\n", to);
if (stat(to, &sb) == 0 && !condmvstate->force)
{
free(to);
return;
}
if (condmvstate->atlas)
{
mytime = time(NULL);
/* We have to add something to the existing file before moving
* to.
*/
file= fopen(condmvstate->from, "a");
if (file == NULL)
{
crondlog(LVL9 "condmv: unable to append to '%s': %s\n",
condmvstate->from, strerror(errno));
free(to);
return;
}
if (fprintf(file, "%s %lu %s\n", condmvstate->atlas, mytime,
condmvstate->from) < 0)
{
crondlog(LVL9 "condmv: unable to append to '%s': %s\n",
condmvstate->from, strerror(errno));
fclose(file);
free(to);
return;
}
if (fclose(file) != 0)
{
crondlog(LVL9 "condmv: unable to close '%s': %s\n",
condmvstate->from, strerror(errno));
free(to);
return;
}
}
if (rename(condmvstate->from, to) != 0)
{
crondlog(LVL9 "condmv: unable to rename '%s' to '%s': %s\n",
condmvstate->from, to, strerror(errno));
}
free(to);
}
static int condmv_delete(void *state)
{
struct condmvstate *condmvstate;
condmvstate= state;
free(condmvstate->from);
condmvstate->from= NULL;
free(condmvstate->to);
condmvstate->to= NULL;
free(condmvstate->atlas);
condmvstate->atlas= NULL;
free(condmvstate);
return 1;
}
struct testops condmv_ops = { condmv_init, condmv_start, condmv_delete };
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