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/*
* server/config.c
*/
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <stdio.h>
#include "dnbd2.h"
#include "tree.h"
#include "file.h"
#include "config.h"
char *get_line(char *buf, FILE *file);
dataset_t *parse_dataset_file(const char *filename);
int parse_server(dnbd2_server_t *server, const char *str);
/*
* The config file looks like this:
*
* 192.168.178.120
* 5000
* /etc/dnbd2/datasets/debian-3.1 192.168.178.119:5005
* /etc/dnbd2/datasets/suse-10.2 192.168.178.119:5005 192.168.178.118:5005
* ...
*
*/
int parse_config_file(const char *filename, struct sockaddr_in *sockaddr,
void **tree)
{
char buf[LINE_SIZE_MAX];
FILE *file;
bzero(sockaddr, sizeof(sockaddr));
sockaddr->sin_family = AF_INET;
/* Open file. */
file = fopen(filename, "r");
if (!file) {
syslog(LOG_ERR, "Could not open config file %s", filename);
return -1;
}
syslog(LOG_NOTICE, "Config file: %s", filename);
/* Read IP from file. */
if (!get_line(buf, file) || !inet_aton(buf, &(sockaddr->sin_addr))) {
syslog(LOG_ERR, "Could not read IP.");
return -1;
}
/* Read port number from file. */
if (!get_line(buf, file) ||
sscanf(buf, "%hu", &(sockaddr->sin_port)) != 1) {
syslog(LOG_ERR, "Could not read port number.");
return -1;
}
sockaddr->sin_port = htons(sockaddr->sin_port);
syslog(LOG_NOTICE, "IP = %s, Port = %hu",
inet_ntoa(sockaddr->sin_addr), ntohs(sockaddr->sin_port));
int datasets = 0;
char server[ALT_SERVERS_MAX][LINE_SIZE_MAX];
char dsfile[LINE_SIZE_MAX];
while (get_line(buf, file)) {
int ret = sscanf(buf, "%s %s %s %s %s",
dsfile,
server[0],
server[1],
server[2],
server[3]) - 1;
/* Parse a dataset file and put it into a tree-node. */
dataset_t *dataset = parse_dataset_file(dsfile);
if (!dataset)
goto out_nodsfile;
node_t *data = (node_t *)malloc(sizeof(node_t));
if (!data) {
syslog(LOG_ERR,
"Could not allocate memory for new Dataset.");
goto out_nodataset;
}
int fd = file_open(dataset->path);
if (fd == -1) {
syslog(LOG_ERR,
"Could not open file or block device %s",
dataset->path);
goto out_nodata;
}
strncpy(data->path, dsfile, FILE_NAME_MAX);
data->ds = dataset;
data->fd = fd;
/* Parse the list of alterntive servers. */
int i;
int cnt = 0;
for (i=0 ; i<ret ; i++)
cnt += parse_server(&data->server[cnt], server[i]);
data->servers = cnt;
/* Check if the Volume-ID-Release-ID pair is already in use. */
node_t *data2 = tree_find(data, tree);
if (data2) {
syslog(LOG_ERR,
"Vol-ID/Rel-ID already used in Dataset file %s",
data2->path);
goto out_nodata;
}
/* Insert Dataset into tree. */
if (tree_insert(data, tree) == -1) {
syslog(LOG_ERR, "Could not insert Dataset into tree.");
goto out_nodata;
}
datasets++;
continue;
out_nodata:
free(data);
out_nodataset:
free(dataset);
out_nodsfile:
syslog(LOG_ERR, "Problem parsing %s", dsfile);
}
syslog(LOG_NOTICE, "Loaded %d Dataset(s).", datasets);
fclose(file);
return datasets;
}
/*
* A dataset config file looks like this:
*
* /path/to/file/or/block/device
* Volume-ID
* Release-ID
*/
dataset_t *parse_dataset_file(const char *filename)
{
char buf[LINE_SIZE_MAX];
FILE *file = fopen(filename, "r");
if (!file) {
syslog(LOG_ERR, "Could not open Dataset file %s", filename);
return NULL;
}
dataset_t *dataset = (dataset_t *) malloc(sizeof(dataset_t));
if (!dataset) {
syslog(LOG_ERR, "Could not allocate memory for new Dataset.");
return NULL;
}
/* Read file- or block device name from file. */
if (!get_line(dataset->path, file)) {
syslog(LOG_ERR, "Could not read path to file or block device");
return NULL;
}
/* Read Volume-ID from file. */
if (!get_line(buf, file) || sscanf(buf, "%hu", &(dataset->vid)) != 1) {
syslog(LOG_ERR, "Could not read Volume-ID.");
return NULL;
}
/* Read Release-ID from file. */
if (!get_line(buf, file) || sscanf(buf, "%hu", &(dataset->rid)) != 1) {
syslog(LOG_ERR, "Could not read Release-ID.");
return NULL;
}
fclose(file);
return dataset;
}
char *get_line(char *buf, FILE *file)
{
char *ret = fgets(buf, LINE_SIZE_MAX, file);
/* change \n with \0 */
if (ret)
buf[strlen(buf)-1] = '\0';
return ret;
}
int parse_server(dnbd2_server_t *server, const char *str)
{
char ip[LINE_SIZE_MAX];
uint16_t port;
struct in_addr tmp;
if (sscanf(str, "%[^:]:%hu", ip, &port) != 2)
return 0;
if (!inet_aton(ip, &tmp))
return 0;
memcpy(&server->ip, &tmp, sizeof(uint32_t));
server->port = htons(port);
return 1;
}
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