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+ statefile.[ch]

master
Alex 'AdUser' Z 7 years ago
parent
commit
fa4c209b28
  1. 127
      src/statefile.c
  2. 27
      src/statefile.h

127
src/statefile.c

@ -0,0 +1,127 @@
/* Copyright 2016 Alex 'AdUser' Z (ad_user@runbox.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "common.h"
#include "log.h"
#include "ipaddr.h"
#include "statefile.h"
f2b_statefile_t *
f2b_statefile_create(const char *statedir, const char *jailname) {
f2b_statefile_t *sf = NULL;
char path[PATH_MAX];
assert(statedir != NULL);
assert(jailname != NULL);
snprintf(path, sizeof(path), "%s/%s.state", statedir, jailname);
if (access(path, R_OK | W_OK) < 0) {
if (errno != ENOENT) {
f2b_log_msg(log_error, "can't access statefile: %s", strerror(errno));
return NULL;
}
int fd = open(path, O_CREAT | O_WRONLY);
if (fd < 0) {
f2b_log_msg(log_error, "can't create statefile: %s", strerror(errno));
return NULL;
}
close(fd);
}
if ((sf = calloc(1, sizeof(f2b_statefile_t))) == NULL) {
f2b_log_msg(log_error, "can't allocate memory for statefile: %s", strerror(errno));
return NULL;
}
strlcpy(sf->path, path, sizeof(sf->path));
return sf;
}
void
f2b_statefile_destroy(f2b_statefile_t *sf) {
if (!sf) return;
free(sf);
}
f2b_ipaddr_t *
f2b_statefile_load(f2b_statefile_t *sf, size_t matches) {
const int fields = 3;
const char *format = "%48s %lu %lu"; /* 48 == IPADDR_MAX == sizeof(addr) */
f2b_ipaddr_t *addrlist = NULL, *ipaddr = NULL;
char buf[256], addr[IPADDR_MAX], *p;
int banned, release;
FILE *f = NULL;
assert(sf != NULL);
if ((f = fopen(sf->path, "r")) == NULL) {
f2b_log_msg(log_error, "can't open statefile: %s", strerror(errno));
return NULL;
}
while(fgets(buf, sizeof(buf), f)) {
p = &buf[0];
while(isspace(*p))
p++; /* skip leading spaces */
if (*p == '#')
continue; /* is comment */
if (sscanf(buf, format, addr, &banned, &release) != fields) {
f2b_log_msg(log_warn, "can't parse, ignoring line: %s", buf);
continue;
}
if ((ipaddr = f2b_ipaddr_create(addr, matches)) == NULL) {
f2b_log_msg(log_warn, "can't parse addr: %s", addr);
continue;
}
ipaddr->banned = true;
ipaddr->banned_at = banned;
ipaddr->release_at = release;
ipaddr->next = addrlist;
addrlist = ipaddr;
}
fclose(f);
return addrlist;
}
bool
f2b_statefile_save(f2b_statefile_t *sf, f2b_ipaddr_t *addrlist) {
const char *fmt = "%s\t%lu\t%lu\n";
char path[PATH_MAX];
FILE *f = NULL;
assert(sf != NULL);
if (addrlist == NULL)
return true;
strlcpy(path, sf->path, sizeof(path));
strlcat(path, ".new", sizeof(path));
if ((f = fopen(path, "w")) == NULL) {
f2b_log_msg(log_error, "can't open statefile: %s", strerror(errno));
return false;
}
fprintf(f, "# address\tbanned_at\trelease_at\n");
for (f2b_ipaddr_t *ipaddr = addrlist; ipaddr != NULL; ipaddr = ipaddr->next) {
if (!ipaddr->banned)
continue;
fprintf(f, fmt, ipaddr->text, ipaddr->banned_at, ipaddr->release_at);
}
fclose(f);
if (rename(path, sf->path) < 0) {
f2b_log_msg(log_error, "can't replace statefile %s: %s", sf->path, strerror(errno));
return false;
}
sf->need_save = false;
return true;
}

27
src/statefile.h

@ -0,0 +1,27 @@
/* Copyright 2016 Alex 'AdUser' Z (ad_user@runbox.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef F2B_STATEFILE_H_
#define F2B_STATEFILE_H_
typedef struct f2b_statefile_t {
char path[PATH_MAX];
bool need_save;
} f2b_statefile_t;
f2b_statefile_t *
f2b_statefile_create(const char *statedir, const char *jailname);
void
f2b_statefile_destroy(f2b_statefile_t *sf);
f2b_ipaddr_t *
f2b_statefile_load(f2b_statefile_t *sf, size_t matches);
bool
f2b_statefile_save(f2b_statefile_t *sf, f2b_ipaddr_t *addrlist);
#endif /* F2B_STATEFILE_H_ */
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