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dc.c
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#include "log.h"
#include <ctype.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <tcpr/types.h>
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#define CERT_FILE "TrustStore.pem"
#define PRI_KEY "privatekey.key"
extern char __data_start, __bss_start, _edata, _end;
/*
* There are two SSL contexts active at a time; between DC and PMU Player
* and between DC and PMU Dumper.
*/
BIO *bio, *bio1;
BIO *sbio, *sbio1;
SSL *ssl = NULL, *ssl1 = NULL;
SSL_CTX *ctx, *ctx1;
int tcpr_sock;
struct tcpr_ip4 state1;
struct sockaddr_in pulladdr1;
int port1;
struct arguments {
char *name;
char *logprefix;
int logbytes;
int logcount;
char *pullhost;
char *pullport;
char *pushhost;
char *pushport;
char *id;
uint32_t port;
};
static int get_tcpr_state(struct tcpr_ip4 *state, int tcprsock,
struct sockaddr_in *peeraddr, uint16_t bindport) {
memset(state, 0, sizeof(*state));
state->peer_address = peeraddr->sin_addr.s_addr;
state->tcpr.hard.peer.port = peeraddr->sin_port;
state->tcpr.hard.port = htons(bindport);
if (send(tcprsock, state, sizeof(*state), 0) < 0)
return -1;
if (recv(tcprsock, state, sizeof(*state), 0) < 0) {
return -1;
}
return 0;
}
/*
* This function sends acknoledgements to the TCPR when DC receives
* data from PMU Player. If DC would stop sending the acknolegements then
* TCPR would stop forwarding packets to DC from PMU Player.
*/
long tcpr_feedback(BIO *bio,int cmd,const char *argp,int argi,
long argl,long ret) {
long r = 1;
if (BIO_CB_RETURN & cmd)
r=ret;
if(cmd == (BIO_CB_READ|BIO_CB_RETURN)) {
get_tcpr_state(&state1, tcpr_sock, &pulladdr1, port1);
state1.tcpr.hard.ack =
htonl(ntohl(state1.tcpr.hard.ack) + ret);
if (send(tcpr_sock, &state1, sizeof(state1), 0) < 0) {
printf("Error in callback!\n");
}
}
return r;
}
static void usage(struct arguments *args) {
fprintf(stderr, "Usage: %s [args] "
"src-ip src-port stream-id dst-ip dst-port\n", args->name);
fprintf(stderr, "Optional arguments:\n");
fprintf(stderr, " -l log-file: "
"prefix of log file name [default = no logging]\n");
fprintf(stderr, " -s log-size: "
"maximum size of a log file [default = unlimited]\n");
fprintf(stderr, " -n log-count: "
"maximum #log files [default = unlimited]\n");
fprintf(stderr, " -p port-number: "
"port number for data collector [default = 10000]\n");
exit(1);
}
static void parse_arguments(struct arguments *args, int argc, char **argv) {
int c;
args->name = argv[0];
while ((c = getopt(argc, argv, "l:n:s:p:")) != -1)
switch (c) {
case 'l':
args->logprefix = optarg;
break;
case 's':
args->logbytes = atoi(optarg);
if (args->logbytes <= 0)
usage(args);
break;
case 'n':
args->logcount = atoi(optarg);
if (args->logcount <= 0)
usage(args);
break;
case 'p':
args->port = atoi(optarg);
break;
default:
usage(args);
}
if (argc - optind != 5)
usage(args);
args->pullhost = argv[optind++];
args->pullport = argv[optind++];
args->id = argv[optind++];
args->pushhost = argv[optind++];
args->pushport = argv[optind++];
}
static int resolve_address(struct sockaddr_in *addr, const char *host,
const char *port) {
struct addrinfo hints;
struct addrinfo *ai;
int err;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
err = getaddrinfo(host, port, &hints, &ai);
if (err)
return err;
memcpy(addr, ai->ai_addr, ai->ai_addrlen);
freeaddrinfo(ai);
return 0;
}
static int connect_to_peer(struct sockaddr_in *peeraddr, uint16_t bindport, int recovering) {
int s;
int yes = 1;
struct sockaddr_in self;
if(ssl == NULL) {
//Connect with PMU Player
ctx = SSL_CTX_new(SSLv23_client_method());
if(! SSL_CTX_load_verify_locations(ctx, CERT_FILE, NULL)) {
fprintf(stderr, "Error loading trust store\n");
ERR_print_errors_fp(stderr);
SSL_CTX_free(ctx);
return 0;
}
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s < 0)
return -1;
if (bindport) {
self.sin_family = AF_INET;
self.sin_addr.s_addr = htonl(INADDR_ANY);
self.sin_port = htons(bindport);
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
if (bind(s, (struct sockaddr *)&self, sizeof(self)) < 0) {
close(s);
return -1;
}
}
if (connect(s, (struct sockaddr *)peeraddr, sizeof(*peeraddr)) < 0) {
close(s);
return -1;
}
get_tcpr_state(&state1, tcpr_sock, &pulladdr1, port1);
SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
SSL_CTX_set_timeout(ctx, 6000);
ssl = SSL_new(ctx);
sbio = BIO_new(BIO_s_socket());
BIO_set_fd(sbio, s, BIO_NOCLOSE);
SSL_set_bio(ssl, sbio, sbio);
BIO_set_callback(sbio,tcpr_feedback);
//If the connection is not new then it is not required to do handshake again.
if(!recovering) {
SSL_connect(ssl);
}
setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
} else {
//Connect with PMU Dumper
ctx1 = SSL_CTX_new(SSLv23_client_method());
if(! SSL_CTX_load_verify_locations(ctx1, CERT_FILE, NULL)) {
fprintf(stderr, "Error loading trust store\n");
ERR_print_errors_fp(stderr);
SSL_CTX_free(ctx1);
return 0;
}
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s < 0)
return -1;
if (bindport) {
self.sin_family = AF_INET;
self.sin_addr.s_addr = htonl(INADDR_ANY);
self.sin_port = htons(bindport);
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
if (bind(s, (struct sockaddr *)&self, sizeof(self)) < 0) {
close(s);
return -1;
}
}
if (connect(s, (struct sockaddr *)peeraddr, sizeof(*peeraddr)) < 0) {
close(s);
return -1;
}
get_tcpr_state(&state1, tcpr_sock, &pulladdr1, port1);
SSL_CTX_set_mode(ctx1, SSL_MODE_AUTO_RETRY);
SSL_CTX_set_timeout(ctx1, 6000);
ssl1 = SSL_new(ctx1);
sbio1 = BIO_new(BIO_s_socket());
BIO_set_fd(sbio1, s, BIO_NOCLOSE);
SSL_set_bio(ssl1, sbio1, sbio1);
SSL_connect(ssl1);
setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
}
return s;
}
static const uint16_t masterport = 6666;
static void *do_handle_slaves(void *arg) {
int sock;
int slavesock;
int yes = 1;
struct sockaddr_in self;
char buffer[1];
(void)arg;
sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
self.sin_family = AF_INET;
self.sin_port = htons(masterport);
self.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(sock, (struct sockaddr *)&self, sizeof(self)) < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
if (listen(sock, 1) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
for (;;) {
slavesock = accept(sock, NULL, NULL);
if (slavesock < 0) {
perror("accept");
continue;
}
while (recv(slavesock, buffer, sizeof(buffer), 0) > 0) ;
close(slavesock);
}
close(sock);
return NULL;
}
static void handle_slaves(void) {
pthread_t t;
if (pthread_create(&t, NULL, do_handle_slaves, NULL)) {
perror("Creating thread to handle slaves");
exit(EXIT_FAILURE);
}
pthread_detach(t);
}
static int connect_to_tcpr(struct sockaddr_in *tcpraddr) {
int s;
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (s < 0)
return -1;
if (connect(s, (struct sockaddr *)tcpraddr, sizeof(*tcpraddr)) < 0) {
close(s);
return -1;
}
return s;
}
static int claim_tcpr_state(struct tcpr_ip4 *state, int tcprsock,
struct sockaddr_in *peeraddr, uint16_t bindport) {
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
if (getsockname(tcprsock, (struct sockaddr *)&addr, &len) < 0)
return -1;
if (get_tcpr_state(state, tcprsock, peeraddr, bindport) < 0)
return -1;
state->address = addr.sin_addr.s_addr;
if (send(tcprsock, state, sizeof(*state), 0) < 0)
return -1;
return 0;
}
static int wait_for_master(struct tcpr_ip4 *state) {
int s;
char buffer[1];
struct sockaddr_in masteraddr;
if (!state->address)
return 0;
masteraddr.sin_family = AF_INET;
masteraddr.sin_addr.s_addr = state->address;
masteraddr.sin_port = htons(masterport);
s = connect_to_peer(&masteraddr, 0, 1);
if (s < 0)
return 1;
while (recv(s, buffer, sizeof(buffer), 0) > 0) ;
close(s);
return 1;
}
static int copy_data(struct tcpr_ip4 *state, struct log *log, int pullsock,
int pushsock, int tcprsock) {
char buffer[65536];
ssize_t nr;
ssize_t ns;
size_t n;
FILE *fp;
for (;;) {
nr = SSL_read(ssl,buffer,sizeof(buffer));
//Take backup of data section and BSS
fp = fopen("bss_backup","wb");
fwrite(&__bss_start,1,&_end - &__bss_start,fp);
fclose(fp);
fp = fopen("data_backup","wb");
fwrite(&__data_start,1,&_edata - &__data_start,fp);
fclose(fp);
/*
* Sleep is put after taking backup because it helps to simulate
* crash and recovery. If we would have not placed sleep then while
* simulating crash, it might so happen that program was in the
* process of creating backup files. Therefore to prevent such
* errors we have put sleep.
*/
sleep(5);
if (nr < 0) {
return -1;
}
else if (nr == 0) {
break;
}
if (log) {
if (log_write(log, buffer, nr) < (size_t)nr)
return -1;
}
for (n = 0; n < (size_t)nr; n += ns) {
ns = SSL_write(ssl1, &buffer[n], nr-n);
//Take backup of data section and BSS
fp = fopen("bss_backup","wb");
fwrite(&__bss_start,1,&_end - &__bss_start,fp);
fclose(fp);
fp = fopen("data_backup","wb");
fwrite(&__data_start,1,&_edata - &__data_start,fp);
fclose(fp);
sleep(5);
if (ns < 0)
return -1;
}
}
state->tcpr.hard.done_reading = 1;
state->tcpr.hard.done_writing = 1;
if (send(tcprsock, state, sizeof(*state), 0) < 0)
return -1;
return 0;
}
int main(int argc, char **argv) {
struct sockaddr_in pulladdr;
struct sockaddr_in pushaddr;
int pullsock;
int pushsock;
int err;
int recovering = 0;
struct arguments args;
struct log *log = NULL;
int tcprsock;
struct tcpr_ip4 state;
FILE *fp;
SSL_load_error_strings();
ERR_load_BIO_strings();
ERR_load_SSL_strings();
SSL_library_init();
OpenSSL_add_all_algorithms();
memset(&args, 0, sizeof(args));
parse_arguments(&args, argc, argv);
err = resolve_address(&pulladdr, args.pullhost, args.pullport);
if (err) {
fprintf(stderr, "%s:%s: %s\n", args.pullhost, args.pullport,
gai_strerror(err));
exit(EXIT_FAILURE);
}
err = resolve_address(&pushaddr, args.pushhost, args.pushport);
if (err) {
fprintf(stderr, "%s:%s: %s\n", args.pushhost, args.pushport,
gai_strerror(err));
exit(EXIT_FAILURE);
}
if (!args.port)
args.port = 10000;
printf("Connecting to TCPR.\n");
tcprsock = connect_to_tcpr(&pulladdr);
if (tcprsock < 0) {
perror("Connecting to TCPR");
exit(EXIT_FAILURE);
}
pulladdr1 = pulladdr;
port1 = args.port;
tcpr_sock = tcprsock;
printf("Waiting for existing master, if any.\n");
if (get_tcpr_state(&state, tcprsock, &pulladdr, args.port) < 0) {
perror("Getting TCPR state");
exit(EXIT_FAILURE);
}
recovering = wait_for_master(&state);
if (recovering) {
printf("Recovering from failed master.\n");
if (claim_tcpr_state(&state, tcprsock, &pulladdr, args.port) < 0) {
perror("Claiming TCPR state");
exit(EXIT_FAILURE);
}
} else {
printf("Creating fresh connection.\n");
}
handle_slaves();
printf("Connecting to data source.\n");
pullsock = connect_to_peer(&pulladdr, args.port, recovering);
if (pullsock < 0) {
perror("Connecting to data source");
exit(EXIT_FAILURE);
}
if(recovering) {
fp = fopen("bss_backup","rb");
fread(&__bss_start,1, &_end - &__bss_start,fp);
fclose(fp);
fp = fopen("data_backup","rb");
fread(&__data_start,1, &_edata - &__data_start,fp);
fclose(fp);
printf("Done loading backup...\n");
}
printf("Connecting to data sink.\n");
pushsock = connect_to_peer(&pushaddr, 0, recovering);
if (pushsock < 0) {
perror("Connecting to data sink");
exit(EXIT_FAILURE);
}
if (args.logprefix) {
printf("Opening log.\n");
log = log_start(args.logprefix, args.logbytes, args.logcount);
}
if (get_tcpr_state(&state, tcprsock, &pulladdr, args.port) < 0) {
perror("Getting TCPR state");
exit(EXIT_FAILURE);
}
if (!recovering) {
printf("Sending ID to data source.\n");
if (send(pullsock, args.id, strlen(args.id), 0) < 0) {
perror("Sending session ID");
exit(EXIT_FAILURE);
}
//Take backup of data section and BSS
fp = fopen("bss_backup","wb");
fwrite(&__bss_start,1,&_end - &__bss_start,fp);
fclose(fp);
fp = fopen("data_backup","wb");
fwrite(&__data_start,1,&_edata - &__data_start,fp);
fclose(fp);
}
if (get_tcpr_state(&state, tcprsock, &pulladdr, args.port) < 0) {
perror("Getting TCPR state");
exit(EXIT_FAILURE);
}
/*
* After recovery DC makes new socket but backed up SSL context contains
* old socket so associate new socket with stored SSL context.
*/
BIO_set_fd(sbio, pullsock, BIO_NOCLOSE);
printf("Copying data from source to sink.\n");
if (copy_data(&state, log, pullsock, pushsock, tcprsock) < 0) {
perror("Copying data");
exit(EXIT_FAILURE);
}
printf("Done.\n");
close(tcprsock);
close(pushsock);
close(pullsock);
return EXIT_SUCCESS;
}