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siahsd/siahsd.c

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C
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#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
/* Libs */
#include <talloc.h>
#include <dbi/dbi.h>
#include <glib.h>
/* Private */
#include "siahsd.h"
#include "siahs.h"
#include "sia.h"
#define MY_DEVICE "RCIPv2.4"
#define CONFIGFILE "/etc/siahsd.conf"
/* TODO:
* - Add debug logging
* - Better error handling (no void functions)
* - Add event connection to jsonbot
* - Keep PROM state and monitor keepalives
* - Make a load balancer that balances REGISTRATION REQUESTS to the proper port
*/
/*
* talloc_quoted_string escapes quotes in a string and encapsulates it in quotes.
* It returns a pointer to talloc'ed memory, the quoted string.
*/
char *talloc_quoted_string(TALLOC_CTX *mem_ctx, const char *string) {
/* Allocate twice the string length, to be safe and not having to realloc all the time */
char *ret = talloc_zero_array(mem_ctx, char, strlen(string) * 2 + 1);
size_t i, j;
if (ret == NULL) return NULL;
ret[0] = '\'';
for (i = 0, j = 1; i < strlen(string); i++, j++) {
if (string[i] == '\'' || string[i] == '\\') {
ret[j] = '\'';
ret[++j] = string[i];
} else {
ret[j] = string[i];
}
}
ret[j] = '\'';
ret[++j] = '\0';
return ret;
}
/*
* parse_message parses the string portion of the SIA-HS message
* and writes the event to the database.
* It returns nothing.
*/
void parse_message(TALLOC_CTX *mem_ctx, dbi_conn conn, struct packet *pkt) {
char *message = talloc_strdup(mem_ctx, pkt->message + strlen("MESSAGE "));
char *ptr = message;
char *prom = ptr;
char *pkt_prom;
char *code;
char *quoted_prom;
char *quoted_code;
char *quoted_long_code;
char *quoted_description;
/* FIXME: Handle out of memory situation better */
if (message == NULL) return;
/* Grab the first part, the prom */
while (*ptr != '\0' && *ptr != 'N') {
ptr++;
}
*ptr++ = '\0';
/* Grab the second part, SIA code */
code = ptr;
while (*ptr != '\0' && *ptr != ',') {
ptr++;
}
if (*ptr != '\0') *ptr++ = '\0';
/* The remaining ptr contains the human readable description string */
/* Ignore alive! messages */
if (strcmp(code, "alive!") == 0) {
/* FIXME We must update some keepalive status somewhere to generate offline messages */
return;
}
/* Assert that string prom is identical to hex representation of pkt->prom */
pkt_prom = talloc_asprintf(message, "%04x", pkt->prom);
/* FIXME: Handle out of memory situation better */
if (pkt_prom == NULL) return;
if (strcmp(pkt_prom, prom) != 0) {
/* FIXME: Error handling should be improved */
return;
}
quoted_prom = talloc_quoted_string(message, prom);
quoted_code = talloc_quoted_string(message, code);
quoted_long_code = talloc_quoted_string(message, sia_code_str(code));
quoted_description = talloc_quoted_string(message, ptr);
printf("%s %s %s -- %s: %s\n", prom, code, ptr, sia_code_str(code), sia_code_desc(code));
dbi_conn_queryf(conn, "INSERT INTO events (timestamp, prom, code, long_code, description) VALUES (NOW(), %s, %s, %s, %s)\n",
quoted_prom, quoted_code, quoted_long_code, quoted_description);
talloc_free(message);
}
/*
* send_reply sends a reply to a SIA-HS transmitter
* It requires a memory context, the socket from which to reply, the socket address to reply to, the original packet
* and a string with the reply message.
* It returns nothing.
*/
void send_reply(TALLOC_CTX *mem_ctx, int sock, struct sockaddr_in from, struct packet *pkt, const char *string) {
int n;
uint8_t *reply;
int i;
uint16_t sum = 0;
uint32_t reply_len;
reply_len = strlen(string) + 36;
reply = talloc_zero_array(mem_ctx, uint8_t, reply_len);
if (reply == NULL) return;
/* Store the length as network ordered uint32_t */
*(uint32_t *)&reply[0] = htonl(reply_len - 4);
/* No clue what these are */
reply[4] = 0x01;
reply[5] = 0x01;
reply[6] = 0x80;
reply[7] = 0x80;
/* Add the device description */
memcpy(&reply[8], MY_DEVICE, strlen(MY_DEVICE));
/* Add the PROM code */
*(uint16_t *)&reply[21] = htons(pkt->prom);
/* No clue what these are */
reply[24] = 0x1E;
reply[25] = 0x03;
reply[26] = 0x84; /* Maybe unencoded 0x01? */
reply[27] = 0x03;
/* Add the message */
memcpy(&reply[34], string, strlen(string));
/* Encode with XOR 0x85 and calculate checksum */
for (i = 0; i < reply_len - 2; i++) {
if (i >= 8)
reply[i] ^= 0x85;
sum += reply[i];
}
/* Store the checksum */
*(uint16_t *)&reply[reply_len - 2] = htons(sum);
printf("Sending %s sum %04x len %d\n", string, sum, reply_len - 4);
n = sendto(sock, reply, reply_len, 0, (struct sockaddr *)&from, sizeof(from));
/* Cleanup */
talloc_free(reply);
}
int main(int argc, char **argv) {
int sock, n, i;
socklen_t fromlen;
struct sockaddr_in server;
struct sockaddr_in from;
TALLOC_CTX *mem_ctx;
GKeyFile *keyfile;
GError *error = NULL;
configuration *conf;
dbi_conn conn;
/* Initialize a memory context */
mem_ctx = talloc_init("siahsd");
/*
* Read the configuration file
*/
keyfile = g_key_file_new ();
if (!g_key_file_load_from_file (keyfile, CONFIGFILE, 0, &error)) {
g_error (error->message);
return -1;
}
conf = talloc(mem_ctx, configuration);
if (conf == NULL) return -1;
conf->database_host = g_key_file_get_string(keyfile, "database",
"host", &error);
if (error) {
printf("No database host supplied in the configuration.\n");
return -1;
}
conf->database_name = g_key_file_get_string(keyfile, "database",
"name", &error);
if (error) {
printf("No database host supplied in the configuration.\n");
return -1;
}
conf->database_driver = g_key_file_get_string(keyfile, "database",
"driver", &error);
if (error) {
printf("No database host supplied in the configuration.\n");
return -1;
}
conf->database_username = g_key_file_get_string(keyfile, "database",
"username", &error);
if (error) {
printf("No database host supplied in the configuration.\n");
return -1;
}
conf->database_password = g_key_file_get_string(keyfile, "database",
"password", &error);
if (error) {
printf("No database host supplied in the configuration.\n");
return -1;
}
conf->siahs_port = g_key_file_get_integer(keyfile, "siahs", "port", &error);
if (error) {
printf("No database host supplied in the configuration.\n");
return -1;
}
/*
* Open up a UDP socket the configured port
*/
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
printf("Could not create socket in server\n");
return -1;
}
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(4000);
server.sin_addr.s_addr = INADDR_ANY;
if (bind(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
printf("Could not bind to socket!\n");
return -1;
}
printf("Connecting to %s database %s at %s", conf->database_driver,
conf->database_name, conf->database_host);
/*
* Open a connection to the database
*/
dbi_initialize(NULL);
conn = dbi_conn_new(conf->database_driver);
dbi_conn_set_option(conn, "host", conf->database_host);
dbi_conn_set_option(conn, "username", conf->database_username);
dbi_conn_set_option(conn, "password", conf->database_password);
dbi_conn_set_option(conn, "dbname", conf->database_name);
dbi_conn_set_option(conn, "encoding", "UTF-8");
if (dbi_conn_connect(conn) < 0) {
printf("Could not connect to the database\n");
return -1;
}
/*
* Wait for packets
*/
fromlen = sizeof(struct sockaddr_in);
while (1) {
uint16_t src_port;
struct packet *pkt;
uint8_t *decoded;
char buf[1024]; /* Purposefully static length */
char *reply_message;
pkt = talloc_zero(mem_ctx, struct packet);
/* FIXME: Handle out of memory situation gracefully */
if (pkt == NULL) return 1;
n = recvfrom(sock, &buf, sizeof(buf), 0, (struct sockaddr *) &from, &fromlen);
if (n < 0) {
printf("Error when receiving in server!\n");
talloc_free(pkt);
continue;
} else if (n == sizeof(buf)) {
printf("Maximum packet size exceeded!\n");
talloc_free(pkt);
continue;
}
src_port = ntohs(from.sin_port);
pkt->len = ntohl(*(uint32_t *)buf);
if (pkt->len > n-4) {
printf("Message length is longer than the packet (not possible!)\n");
talloc_free(pkt);
continue;
}
pkt->unknown1 = buf[4];
pkt->unknown2 = buf[5];
pkt->unknown3 = ntohs(*(uint16_t *)&buf[5]);
decoded = talloc_memdup(pkt, &buf[8], pkt->len - 6);
/* FIXME: Handle out of memory situation gracefully */
if (decoded == NULL) return 1;
/* Decode with XOR 0xB6 */
for (i = 0;i < pkt->len - 6; i++) {
decoded[i] ^= 0xB6;
}
pkt->device = talloc_strndup(pkt, (char *)decoded, 12);
/* FIXME: Handle out of memory situation gracefully */
if (pkt->device == NULL) return 1;
pkt->prom = ntohs(*(uint16_t *)&decoded[13]);
pkt->unknown4 = decoded[16];
pkt->unknown5 = decoded[17];
pkt->unknown6 = decoded[18];
pkt->message = talloc_strndup(pkt, (char *) &decoded[26], pkt->len-32);
/* FIXME: Handle out of memory situation gracefully */
if (pkt->message == NULL) return 1;
printf("I have received device %s prom %x, message %s, from IP %s and port %u \n", pkt->device, pkt->prom, pkt->message, inet_ntoa(from.sin_addr), src_port);
/* Handle registrations, reconnects and messages */
if (strcmp(pkt->message, "REGISTRATION REQUEST") == 0) {
/* XXX I'm sending this to this very same socket now. This should be used as a dispatcher */
reply_message = talloc_asprintf(pkt, "REGISTRATION RENEWAL AT PORT %05d", conf->siahs_port);
if (reply_message == NULL) return -1;
send_reply(pkt, sock, from, pkt, reply_message);
} else if (strcmp(pkt->message, "RECONNECT REQUEST") == 0) {
/* XXX This is the first message that arrives at the registration referred port */
reply_message = talloc_asprintf(pkt, "RECONNECTED AT PORT %05d", conf->siahs_port);
if (reply_message == NULL) return -1;
send_reply(pkt, sock, from, pkt, reply_message);
} else if (strncmp(pkt->message, "MESSAGE ", strlen("MESSAGE ")) == 0) {
send_reply(pkt, sock, from, pkt, "ACKNOWLEDGE MESSAGE");
parse_message(pkt, conn, pkt);
} else {
printf("==============================================\n"
"ERROR: Could not parse this message\n"
"==============================================\n");
}
/* Clean up everything that's been attached to this packet */
talloc_free(pkt);
}
}
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