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main.c
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/*
******************************************************************
udpbroadcastrelay (c)2020 Martin Wasley <github.com/marjohn56> & Berto Furth <github.com/bertofurth>
udp-broadcast-relay-redux
Relays UDP broadcasts to other networks, forging
the sender address.
Copyright (c) 2017 Michael Morrison <github.com/sonicsnes>
Copyright (c) 2003 Joachim Breitner <[email protected]>
Copyright (C) 2002 Nathan O'Sullivan
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
******************************************************************
*/
#define MAXIFS 256
#define MAXCIDRACL 256
#define MAXMULTICAST 256
#define MAXBLOCKIDS 256
#define MAX_MSEARCH_FILTERS 64
#define MAX_MSEARCH_PROXY 256
#define MAX_LOCATOR_LISTENER 256
#define MAX_LOCATOR_PROXIES 256
#define MAX_REST_LISTENER 256
#define MAX_REST_PROXIES 256
#define MAX_PROXY_SOCKETS (MAX_MSEARCH_PROXY + MAX_LOCATOR_LISTENER + MAX_LOCATOR_PROXIES + MAX_REST_LISTENER + MAX_REST_PROXIES)
/*
* MAXID used to be 99 when TTL was marked with the ID but
* now that DSCP is used it needs to be limited to 6 bits.
*/
#define MAXID 63
#define DPRINT if (debug) printf
#define DPRINT2 if (debug>=2) printf
#define DPRINTTIME if (debug>=2) printtime()
#define IPHEADER_LEN 20
#define UDPHEADER_LEN 8
#define HEADER_LEN (IPHEADER_LEN + UDPHEADER_LEN)
#define TTL_ID_OFFSET 64
#define SIGF_TERM 0x1
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <stdio.h>
#ifdef __FreeBSD__
#include <net/if.h>
#include <net/if_dl.h>
#else
#include <linux/if.h>
#endif
#include <sys/ioctl.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <poll.h>
#include <strings.h>
#include <netdb.h>
#include <fcntl.h>
static int debug = 0;
static char g_pidfile[128];
/* list of addresses and interface numbers on local machine */
struct Iface {
struct in_addr dstaddr;
struct in_addr ifaddr;
char* ifname;
int ifindex;
int raw_socket;
};
static struct Iface ifs[MAXIFS];
static int maxifs = 0;
#define ACTION_BLOCK 0
#define ACTION_ALLOW 1
/* list of CIDR ACL entries */
struct CIDRACL {
struct in_addr network;
struct in_addr mask;
u_short numbits;
u_short action;
};
static struct CIDRACL CIDRs[MAXCIDRACL];
static int numCIDRs = 0;
static int defaultCIDRaction = ACTION_ALLOW;
/* Where we forge our packets */
static u_char gram[4096+HEADER_LEN]=
{
0x45, 0x00, 0x00, 0x26,
0x12, 0x34, 0x00, 0x00,
0xFF, 0x11, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0x00, 0x12, 0x00, 0x00,
'1','2','3','4','5','6','7','8','9','0'
};
static u_short fragmentID = 0;
/* types of sockets we receive data on */
#define MAIN_SOCKET 0
#define MSEARCH_SOCKET 1
#define LOCSVC_LISTENER 2
#define LOCSVC_CIENTSOCK 3
#define LOCSVC_SERVERSOCK 4
#define RESTSVC_LISTENER 5
#define RESTSVC_CIENTSOCK 6
#define RESTSVC_SERVERSOCK 7
#define MSEARCH_PROXY_EXPIRY 60
#define LOCATOR_LISTENER_EXPIRY 86400
#define REST_LISTENER_EXPIRY 86400
#define BLOCK_RETRY_TIME 10
#define MSEARCH_MARKER "M-SEARCH * HTTP/1.1\r\n"
#define NOTIFY_MARKER "NOTIFY * HTTP/1.1\r\n"
#define LOCATION_STRING_PREFIX "LOCATION: http://"
#define APPLICATION_STRING_PREFIX "Application-URL: http://"
#define MSEARCH_ACTION_FORWARD 1 // Forward M-SEARCH just like other UDP packets
#define MSEARCH_ACTION_BLOCK 2 // Drop M-SEARCH requests with this search string
#define MSEARCH_ACTION_PROXY 3 // Proxy M-SEARCH request an response via udpbroadcastrelay without modifying packet data
#define MSEARCH_ACTION_DIAL 10 // Full DIAL protocol processing proxy
/* Define an individual M-SEARCH filter */
struct MSEARCHFilter {
char* searchstring;
int action;
};
static struct MSEARCHFilter msearch_filters[MAX_MSEARCH_FILTERS];
static int num_msearch_filters= 0;
static int default_msearch_action= MSEARCH_ACTION_FORWARD;
/* list of SSDP M-SEARCH reply listener proxies */
struct MSEARCHProxy {
time_t expirytime;
unsigned int proxyid;
struct in_addr clienthost;
u_short clientport;
struct Iface* clientiface;
u_short localport;
int action;
int sock;
};
static struct MSEARCHProxy msearch_proxies[MAX_MSEARCH_PROXY];
static int num_msearch_proxies= 0;
static unsigned int next_msearch_proxyid= 0;
/* list of DIAL Locator service listners */
struct LocatorSvcListener {
time_t expirytime;
unsigned int listenerid;
struct in_addr serveraddr;
u_short serverport;
struct in_addr localaddr;
u_short localport;
int sock;
};
static struct LocatorSvcListener locatorsvc_listeners[MAX_LOCATOR_LISTENER];
static int num_locatorsvc_listeners= 0;
static unsigned int next_locatorsvc_listenerid= 0;
/* list of DIAL Locator service proxies */
struct LocatorSvcProxy {
unsigned int proxyid;
int clientsock;
int serversock;
struct in_addr serveraddr;
u_short serverport;
struct in_addr clientaddr;
u_short clientport;
struct in_addr slocaladdr;
u_short slocalport;
struct in_addr clocaladdr;
u_short clocalport;
};
static struct LocatorSvcProxy locatorsvc_proxies[MAX_LOCATOR_PROXIES];
static int num_locatorsvc_proxies= 0;
static unsigned int next_locatorsvc_proxyid= 0;
/* list of REST service listners */
struct RESTSvcListener {
time_t expirytime;
unsigned int listenerid;
struct in_addr serveraddr;
u_short serverport;
struct in_addr localaddr;
u_short localport;
int sock;
};
static struct RESTSvcListener restsvc_listeners[MAX_REST_LISTENER];
static int num_restsvc_listeners= 0;
static unsigned int next_restsvc_listenerid= 0;
/* list of REST service proxies */
struct RESTSvcProxy {
unsigned int proxyid;
int clientsock;
int serversock;
struct in_addr serveraddr;
u_short serverport;
struct in_addr clientaddr;
u_short clientport;
struct in_addr slocaladdr;
u_short slocalport;
struct in_addr clocaladdr;
u_short clocalport;
};
static struct RESTSvcProxy restsvc_proxies[MAX_REST_PROXIES];
static int num_restsvc_proxies= 0;
static unsigned int next_restsvc_proxyid= 0;
char* get_msearch_action_name (int action)
{
switch (action) {
case MSEARCH_ACTION_FORWARD:
return "FORWARD";
case MSEARCH_ACTION_BLOCK:
return "BLOCK";
case MSEARCH_ACTION_PROXY:
return "PROXY";
case MSEARCH_ACTION_DIAL:
return "DIAL";
}
return "<unknown>";
}
char ifname_buf[64];
char* ifname_from_idx (int ifindex)
{
for (int i=0; i<maxifs; i++)
if (ifs[i].ifindex == ifindex)
return ifs[i].ifname;
// shouldn't happen...
snprintf(ifname_buf, sizeof(ifname_buf), "Idx_%i", ifindex);
return ifname_buf;
}
/* CIDR ACL compare function to qsort with descending mask size */
int CIDRcompare (const void*a, const void* b)
{
return ((const struct CIDRACL*) b)->numbits - ((const struct CIDRACL*) a)->numbits;
}
/* Parse CIDR string into a network number and mask. Return 0 if CIDR string is invalid */
int parse_cidr(char *str, struct CIDRACL* CIDR)
{
char buf[256];
char *s;
int numbits;
strncpy(buf, str, sizeof(buf));
s = strchr(buf, '/');
if (!s) {
return 0;
}
*(s++) = 0;
if (!inet_aton(buf, &(CIDR->network))) {
return 0;
}
numbits = atoi(s);
if ((numbits < 0) || (numbits > 32)) {
return 0;
}
CIDR->numbits = numbits;
CIDR->mask.s_addr = htonl((0xFFFFFFFFUL << (32 - numbits)) & 0xFFFFFFFFUL);
CIDR->network.s_addr &= CIDR->mask.s_addr;
return 1;
}
void inet_ntoa2(struct in_addr in, char* chr, int len) {
char* from = inet_ntoa(in);
strncpy(chr, from, len);
}
/* Check if packet should be blocked based on source IP. Return 0 to block packet */
int check_cidr_acl(struct in_addr fromAddress)
{
int i;
int action = defaultCIDRaction;
for (i = 0; i < numCIDRs; i++) {
if ((fromAddress.s_addr & CIDRs[i].mask.s_addr) == CIDRs[i].network.s_addr) {
action = CIDRs[i].action;
break;
}
}
if (action == ACTION_BLOCK) {
if (i < numCIDRs) {
char network[255];
inet_ntoa2(CIDRs[i].network, network, sizeof(network));
DPRINT("Source IP matches blocked CIDR %s/%i. Packet Ignored.\n\n", network, CIDRs[i].numbits);
} else {
DPRINT("Source IP does not match any allowed CIDR range. Packet Ignored.\n\n");
}
return 0;
}
return 1;
}
// Print formatted current time for log
void printtime (void)
{
struct timeval tv;
time_t now;
long millisec;
struct tm* tm;
if (gettimeofday(&tv,NULL) == -1)
return;
now = tv.tv_sec;
tm = localtime(&now);
millisec = tv.tv_usec / 1000;
printf("%04i/%02i/%02i %02i:%02i:%02i.%03i ", tm->tm_year + 1900, tm->tm_mon + 1,
tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, (int) millisec);
}
// Set socket options to receive TTL, TOS, receiving IP and interface for a socket.
// Return 0 on errror.
int enable_recvmsg_headers (int s, char *callername)
{
int yes = 1;
#ifdef __FreeBSD__
if(setsockopt(s, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes))<0) {
fprintf(stderr,"IP_RECVTTL (%s): %s\n",callername,strerror(errno));
return 0;
};
if(setsockopt(s, IPPROTO_IP, IP_RECVTOS, &yes, sizeof(yes))<0) {
fprintf(stderr,"IP_RECVTOS (%s): %s\n",callername,strerror(errno));
return 0;
};
if(setsockopt(s, IPPROTO_IP, IP_RECVIF, &yes, sizeof(yes))<0) {
fprintf(stderr,"IP_RECVIF (%s): %s\n",callername,strerror(errno));
return 0;
};
if(setsockopt(s, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes))<0) {
fprintf(stderr,"IP_RECVDSTADDR (%s): %s\n",callername,strerror(errno));
return 0;
};
#else
if(setsockopt(s, SOL_IP, IP_RECVTTL, &yes, sizeof(yes))<0) {
fprintf(stderr,"IP_RECVTTL (%s): %s\n",callername,strerror(errno));
return 0;
};
if(setsockopt(s, SOL_IP, IP_RECVTOS, &yes, sizeof(yes))<0) {
fprintf(stderr,"IP_RECVTOS (%s): %s\n",callername,strerror(errno));
return 0;
};
if(setsockopt(s, SOL_IP, IP_PKTINFO, &yes, sizeof(yes))<0) {
fprintf(stderr,"IP_PKTINFO (%s): %s\n",callername,strerror(errno));
return 0;
};
#endif
return 1;
}
// Receive message on socket and return address info. Also check that
// packet was received on a managed interface. to_port is passed in
// for debug print info. Returns number of bytes received or <0 for error
int recv_with_addrinfo (int s, void *buf, size_t buflen, struct Iface **iface_out,
struct in_addr *from_inaddr_out, u_short *from_port_out,
struct in_addr *to_inaddr_out, u_short to_port)
{
struct in_addr from_inaddr;
struct in_addr to_inaddr;
u_short from_port;
struct sockaddr_in rcv_addr;
struct msghdr rcv_msg;
struct iovec iov;
iov.iov_base = buf;
iov.iov_len = buflen;
u_char pkt_infos[16384];
int len;
rcv_msg.msg_name = &rcv_addr;
rcv_msg.msg_namelen = sizeof(rcv_addr);
rcv_msg.msg_iov = &iov;
rcv_msg.msg_iovlen = 1;
rcv_msg.msg_control = pkt_infos;
rcv_msg.msg_controllen = sizeof(pkt_infos);
len = recvmsg(s,&rcv_msg,0);
if (len <= 0) return len; /* ignore broken packets */
from_inaddr = rcv_addr.sin_addr;
from_port = ntohs(rcv_addr.sin_port);
/* Find the receiving interface and IP address */
struct cmsghdr *cmsg;
int rcv_ifindex = 0;
int foundRcvIf = 0;
int foundRcvIp = 0;
if (rcv_msg.msg_controllen > 0) {
for (cmsg=CMSG_FIRSTHDR(&rcv_msg);cmsg;cmsg=CMSG_NXTHDR(&rcv_msg,cmsg)) {
#ifdef __FreeBSD__
if (cmsg->cmsg_type==IP_RECVDSTADDR) {
to_inaddr=*((struct in_addr *)CMSG_DATA(cmsg));
foundRcvIp = 1;
}
if (cmsg->cmsg_type==IP_RECVIF) {
rcv_ifindex=((struct sockaddr_dl *)CMSG_DATA(cmsg))->sdl_index;
foundRcvIf = 1;
}
#else
if (cmsg->cmsg_type==IP_PKTINFO) {
rcv_ifindex=((struct in_pktinfo *)CMSG_DATA(cmsg))->ipi_ifindex;
foundRcvIf = 1;
to_inaddr=((struct in_pktinfo *)CMSG_DATA(cmsg))->ipi_addr;
foundRcvIp = 1;
}
#endif
}
}
if (!foundRcvIp) {
perror("Source IP not found on incoming packet\n");
return -2;
}
if (!foundRcvIf) {
perror("Interface not found on incoming packet\n");
return -2;
}
char from_addrstr[255];
inet_ntoa2(from_inaddr, from_addrstr, sizeof(from_addrstr));
char to_addrstr[255];
inet_ntoa2(to_inaddr, to_addrstr, sizeof(to_addrstr));
DPRINTTIME;
DPRINT("<- [ %s:%d -> %s:%d (iface=%s len=%i)\n",
from_addrstr, from_port, to_addrstr, to_port,
ifname_from_idx(rcv_ifindex), len
);
foundRcvIf = 0;
for (int iIf = 0; iIf < maxifs; iIf++) {
if (ifs[iIf].ifindex == rcv_ifindex) {
if (iface_out) *iface_out = &ifs[iIf];
foundRcvIf = 1;
}
}
if (!foundRcvIf) {
DPRINT("Not from managed iface\n\n");
return -3;
}
if (numCIDRs) {
if (!check_cidr_acl(from_inaddr))
return -4;
}
if (from_inaddr_out) *from_inaddr_out = from_inaddr;
if (from_port_out) *from_port_out = from_port;
if (to_inaddr_out) *to_inaddr_out = to_inaddr;
return len;
}
// Bind socket to 0.0.0.0:0 and return the local port number associated with
// the socket or return 0 on error.
u_short get_sock_local_port(int s, in_addr_t localip, char *callername)
{
struct sockaddr_in bind_addr;
struct sockaddr_in local_addr;
socklen_t local_addr_size = sizeof(local_addr);
bind_addr.sin_family = AF_INET;
bind_addr.sin_port = 0;
bind_addr.sin_addr.s_addr = localip;
if(bind(s, (struct sockaddr *)&bind_addr, sizeof(bind_addr)) < 0) {
fprintf(stderr,"bind (%s): %s\n",callername,strerror(errno));
return 0;
}
if(getsockname(s, (struct sockaddr *)&local_addr, &local_addr_size)<0) {
fprintf(stderr,"getsockname (%s): %s\n",callername,strerror(errno));
return 0;
}
return ntohs(local_addr.sin_port);
}
int extract_address (char *str, char *prefix, char **addr_start_ptr, char **addr_end_ptr,
struct in_addr *ipaddr, u_short *port)
{
char *startptr = str;
char *termptr = NULL;
int prefixlen = strlen(prefix);
char addrstr[64];
int addrlen;
while (*startptr) {
if (!strncasecmp(startptr,prefix,prefixlen)) {
break;
}
startptr++;
}
if (!*startptr) {
return 0;
}
startptr += prefixlen;
termptr = strchr(startptr,'/');
if (!termptr) {
return 0;
}
addrlen = termptr-startptr;
if (addrlen>=sizeof(addrstr)) {
return 0;
}
*addr_start_ptr = startptr;
*addr_end_ptr = termptr;
memcpy(addrstr,startptr,addrlen);
addrstr[addrlen] = 0;
termptr = strchr(addrstr,':');
*port = 80; // default if no port was found
if (termptr) {
*termptr = 0;
*port = atoi(termptr+1);
}
struct addrinfo hints;
struct addrinfo *results;
memset(&hints,0,sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(addrstr, NULL, &hints, &results) != 0) {
perror("getaddrinfo");
return 0;
}
*ipaddr = ((struct sockaddr_in*)(results->ai_addr))->sin_addr;
freeaddrinfo(results);
return 1;
}
u_short find_or_create_restsvc_listener(struct in_addr servertoaddr, u_short servertoport, struct in_addr listenaddr)
{
char serveraddrStr[255];
char localaddrStr[255];
time_t now = time(NULL);
int i= 0;
// Look for an existing proxy for this destination host ip:port
while (i < num_restsvc_listeners) {
if (restsvc_listeners[i].expirytime < now) {
inet_ntoa2(restsvc_listeners[i].serveraddr, serveraddrStr, sizeof(serveraddrStr));
inet_ntoa2(restsvc_listeners[i].localaddr, localaddrStr, sizeof(localaddrStr));
DPRINT2(" _Expire REST_Svc listener [id=%u] for proxy to %s:%d on local address %s:%d. %d proxies left\n",
restsvc_listeners[i].listenerid,
serveraddrStr, restsvc_listeners[i].serverport,
localaddrStr, restsvc_listeners[i].localport,
num_restsvc_listeners-1
);
close(restsvc_listeners[i].sock);
memcpy(restsvc_listeners+i, restsvc_listeners+(--num_restsvc_listeners), sizeof(*restsvc_listeners));
continue;
}
if( (restsvc_listeners[i].serveraddr.s_addr == servertoaddr.s_addr) &&
(restsvc_listeners[i].serverport == servertoport) &&
(restsvc_listeners[i].localaddr.s_addr == listenaddr.s_addr)) {
inet_ntoa2(restsvc_listeners[i].serveraddr, serveraddrStr, sizeof(serveraddrStr));
inet_ntoa2(restsvc_listeners[i].localaddr, localaddrStr, sizeof(localaddrStr));
DPRINT(" Found existing REST_Svc listener [id=%u] for proxy to %s:%d on local address %s:%d.\n",
restsvc_listeners[i].listenerid,
serveraddrStr, restsvc_listeners[i].serverport,
localaddrStr, restsvc_listeners[i].localport
);
restsvc_listeners[i].expirytime = now+REST_LISTENER_EXPIRY; // Update expiry time
return restsvc_listeners[i].localport;
}
i++;
}
// Add new proxy because there is no existing match
if(num_restsvc_listeners == MAX_REST_LISTENER) {
DPRINT("Can't add new REST_Svc listener - maximum number of listeners reached\n\n");
return 0;
}
int newsock;
u_short localport;
if((newsock=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("socket (REST_Svc listener)");
return 0;
};
if ((localport = get_sock_local_port(newsock, listenaddr.s_addr,"LocatorSvc listener")) == 0) {
close(newsock);
return 0;
}
if(listen(newsock, 3) < 0) {
perror("listen (REST_Svc listener)");
close(newsock);
return 0;
}
restsvc_listeners[num_restsvc_listeners].expirytime = now+REST_LISTENER_EXPIRY;
restsvc_listeners[num_restsvc_listeners].listenerid = next_restsvc_listenerid++;
restsvc_listeners[num_restsvc_listeners].serveraddr = servertoaddr;
restsvc_listeners[num_restsvc_listeners].serverport = servertoport;
restsvc_listeners[num_restsvc_listeners].sock = newsock;
restsvc_listeners[num_restsvc_listeners].localaddr = listenaddr;
restsvc_listeners[num_restsvc_listeners].localport = localport;
num_restsvc_listeners++;
inet_ntoa2(servertoaddr, serveraddrStr, sizeof(serveraddrStr));
inet_ntoa2(listenaddr, localaddrStr, sizeof(localaddrStr));
DPRINT(" Created REST_Svc listener [id=%u] for proxy to %s:%d on local address %s:%d. Total proxies: %d\n",
restsvc_listeners[num_restsvc_listeners-1].listenerid,
serveraddrStr, servertoport,
localaddrStr, localport, num_restsvc_listeners
);
return localport;
}
void handle_rest_services_accept (int listerneridx)
{
int serversock;
int clientsock;
struct sockaddr_in clientaddr;
struct sockaddr_in serveraddr;
socklen_t clientaddrlen = sizeof(clientaddr);
char clientaddrStr[255];
char serveraddrStr[255];
if ((clientsock = accept(restsvc_listeners[listerneridx].sock, (struct sockaddr *)&clientaddr,
&clientaddrlen)) < 0)
{
perror("accept (REST_Svc proxy)");
return;
}
int flags;
if ((flags = fcntl(clientsock, F_GETFL, 0)) < 0) {
flags = 0;
}
if (fcntl(clientsock, F_SETFL, flags | O_NONBLOCK) < 0)
{
perror("accept (REST_Svc proxy)");
}
inet_ntoa2(clientaddr.sin_addr, clientaddrStr, sizeof(clientaddrStr));
DPRINT("REST_Svc proxy - accepted connection from client %s:%d\n",
clientaddrStr, clientaddr.sin_port
);
if (num_restsvc_proxies==MAX_REST_PROXIES) {
DPRINT("... closing connection. No free proxy slots\n");
close(clientsock);
return;
}
if ((serversock = socket(AF_INET, SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP)) < 0) {
perror("socket (REST_Svc proxy)");
close(clientsock);
return;
}
memset(&serveraddr, 0, sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(restsvc_listeners[listerneridx].serverport);
serveraddr.sin_addr = restsvc_listeners[listerneridx].serveraddr;
if (connect(serversock, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0) {
if (errno==EINPROGRESS) {
// Give the connection 500ms time to complete
struct pollfd fds[1];
fds[0].fd = serversock;
fds[0].events = POLLOUT;
if (poll(fds,1,500)<1) {
perror("poll (REST_Svc proxy)");
close(serversock);
close(clientsock);
DPRINT("... closing connection. Connection timeout to peer\n");
return;
}
if (!(fds[0].revents & POLLOUT)) {
close(serversock);
close(clientsock);
DPRINT("... closing connection. Connection to peer not ready for writing\n");
return;
}
} else {
perror("connect (REST_Svc proxy)");
close(serversock);
close(clientsock);
DPRINT("... closing connection. Connection error to peer\n");
return;
}
}
// Get local addresses
struct sockaddr_in lserveraddr;
struct sockaddr_in lclientaddr;
socklen_t addrsize = sizeof(lserveraddr);
memset (&lserveraddr, 0, sizeof(lserveraddr));
if (getsockname(serversock, (struct sockaddr *)&lserveraddr, &addrsize) < 0) {
perror("getsockname (REST_Svc proxy lserveraddr)");
}
memset (&lclientaddr, 0, sizeof(lclientaddr));
if (getsockname(clientsock, (struct sockaddr *)&lclientaddr, &addrsize) < 0) {
perror("getsockname (REST_Svc proxy lclientaddr)");
}
// scavange old, closed proxy list entries
int i= 0;
while (i < num_restsvc_proxies) {
if (restsvc_proxies[i].clientsock < 0) {
inet_ntoa2(restsvc_proxies[i].clientaddr, clientaddrStr, sizeof(clientaddrStr));
inet_ntoa2(restsvc_proxies[i].serveraddr, serveraddrStr, sizeof(serveraddrStr));
DPRINT2(" _Scavange REST_Svc proxy [id=%u] for client %s:%d to server %s:%d. %d proxies left\n",
restsvc_proxies[i].proxyid,
clientaddrStr, restsvc_proxies[i].clientport,
serveraddrStr, restsvc_proxies[i].serverport,
num_restsvc_proxies-1
);
memcpy(restsvc_proxies+i, restsvc_proxies+(--num_restsvc_proxies), sizeof(*restsvc_proxies));
continue;
}
i++;
}
// add to proxy list
restsvc_proxies[num_restsvc_proxies].proxyid = next_restsvc_proxyid++;
restsvc_proxies[num_restsvc_proxies].clientsock = clientsock;
restsvc_proxies[num_restsvc_proxies].serversock = serversock;
restsvc_proxies[num_restsvc_proxies].serveraddr = restsvc_listeners[listerneridx].serveraddr;
restsvc_proxies[num_restsvc_proxies].serverport = restsvc_listeners[listerneridx].serverport;
restsvc_proxies[num_restsvc_proxies].clientaddr = clientaddr.sin_addr;
restsvc_proxies[num_restsvc_proxies].clientport = ntohs(clientaddr.sin_port);
restsvc_proxies[num_restsvc_proxies].slocaladdr = lserveraddr.sin_addr;
restsvc_proxies[num_restsvc_proxies].slocalport = ntohs(lserveraddr.sin_port);
restsvc_proxies[num_restsvc_proxies].clocaladdr = lclientaddr.sin_addr;
restsvc_proxies[num_restsvc_proxies].clocalport = ntohs(lclientaddr.sin_port);
num_restsvc_proxies++;
inet_ntoa2(clientaddr.sin_addr, clientaddrStr, sizeof(clientaddrStr));
inet_ntoa2(restsvc_listeners[listerneridx].serveraddr, serveraddrStr, sizeof(serveraddrStr));
DPRINT(" Added LocatorSvc proxy [id=%u] for client %s:%d to server %s:%d. Total proxies: %d\n",
restsvc_proxies[num_restsvc_proxies-1].proxyid,
clientaddrStr, restsvc_proxies[num_restsvc_proxies-1].clientport,
serveraddrStr, restsvc_proxies[num_restsvc_proxies-1].serverport,
num_restsvc_proxies
);
}
void handle_restsvc_proxy_recv (int proxyidx, int socktype)
{
int fromsock, tosock;
struct in_addr fromaddr;
struct in_addr fromlocaladdr;
struct in_addr toaddr;
struct in_addr tolocaladdr;
u_short fromport;
u_short fromlocalport;
u_short toport;
u_short tolocalport;
char toaddrStr[255];
char fromaddrStr[255];
char localaddrStr[255];
if (socktype==RESTSVC_CIENTSOCK) {
fromsock = restsvc_proxies[proxyidx].clientsock;
tosock = restsvc_proxies[proxyidx].serversock;
fromaddr = restsvc_proxies[proxyidx].clientaddr;
tolocaladdr = restsvc_proxies[proxyidx].clocaladdr;
toaddr = restsvc_proxies[proxyidx].serveraddr;
fromlocaladdr = restsvc_proxies[proxyidx].slocaladdr;
fromport = restsvc_proxies[proxyidx].clientport;
tolocalport = restsvc_proxies[proxyidx].clocalport;
toport = restsvc_proxies[proxyidx].serverport;
fromlocalport = restsvc_proxies[proxyidx].slocalport;
} else {
fromsock = restsvc_proxies[proxyidx].serversock;
tosock = restsvc_proxies[proxyidx].clientsock;
fromaddr = restsvc_proxies[proxyidx].serveraddr;
tolocaladdr = restsvc_proxies[proxyidx].slocaladdr;
toaddr = restsvc_proxies[proxyidx].clientaddr;
fromlocaladdr = restsvc_proxies[proxyidx].clocaladdr;
fromport = restsvc_proxies[proxyidx].serverport;
tolocalport = restsvc_proxies[proxyidx].slocalport;
toport = restsvc_proxies[proxyidx].clientport;
fromlocalport = restsvc_proxies[proxyidx].clocalport;
}
char buffer[32768];
int numread;
int numwritten;
numread = recv (fromsock, buffer, sizeof(buffer), 0);
inet_ntoa2(fromaddr, fromaddrStr, sizeof(fromaddrStr));
inet_ntoa2(tolocaladdr, localaddrStr, sizeof(localaddrStr));
DPRINTTIME;
DPRINT("<- TCP [ %s:%d -> %s:%d (len=%i)] to REST_Svc proxy [id=%u]\n",
fromaddrStr, fromport, localaddrStr, tolocalport,
numread, restsvc_proxies[proxyidx].proxyid
);
if (numread<=0) {
DPRINT2((numread==0)?
" %s connection gracefully closed. Shutting down REST_Svc proxy [id=%u].\n":
" Error reading %s socket. Shutting down REST_Svc proxy [id=%u].\n\n",
socktype==RESTSVC_CIENTSOCK?"Client":"Server", restsvc_proxies[proxyidx].proxyid
);
close(restsvc_proxies[proxyidx].clientsock);
close(restsvc_proxies[proxyidx].serversock);
restsvc_proxies[proxyidx].clientsock = -1;
restsvc_proxies[proxyidx].serversock = -1;
return;
}
numwritten = send(tosock, buffer, numread, 0);
if (numwritten < 0) {
if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) {
inet_ntoa2(toaddr, toaddrStr, sizeof(toaddrStr));
DPRINT(" REST_Svc proxy [id=%u] would block sending to %s:%d. Retrying in %dms\n",
restsvc_proxies[proxyidx].proxyid, toaddrStr, toport, BLOCK_RETRY_TIME);
struct pollfd fds[1];
fds[0].fd = tosock;
fds[0].events = POLLOUT;
poll(fds,1,BLOCK_RETRY_TIME);
numwritten = send(tosock, buffer, numread, 0);
if (numwritten < 0) {
perror("send (REST_Svc proxy retry)");
DPRINT(" REST_Svc proxy [id=%u] would block still block. Shutting down proxy\n",
restsvc_proxies[proxyidx].proxyid);
close(restsvc_proxies[proxyidx].clientsock);
close(restsvc_proxies[proxyidx].serversock);
restsvc_proxies[proxyidx].clientsock = -1;
restsvc_proxies[proxyidx].serversock = -1;
return;
}
} else {
perror("send (REST_Svc proxy)");
inet_ntoa2(toaddr, toaddrStr, sizeof(toaddrStr));
DPRINT(" REST_Svc proxy [id=%u] error sending to %s:%d. Shutting down proxy\n",
restsvc_proxies[proxyidx].proxyid, toaddrStr, toport);
close(restsvc_proxies[proxyidx].clientsock);
close(restsvc_proxies[proxyidx].serversock);
restsvc_proxies[proxyidx].clientsock = -1;
restsvc_proxies[proxyidx].serversock = -1;
return;
}
}
inet_ntoa2(fromlocaladdr, localaddrStr, sizeof(localaddrStr));
inet_ntoa2(toaddr, toaddrStr, sizeof(toaddrStr));
inet_ntoa2(fromaddr, fromaddrStr, sizeof(fromaddrStr));
DPRINTTIME;
DPRINT("-> TCP [ %s:%d -> %s:%d (len=%i)] for %s %s:%d via REST_Svc proxy [id=%u]\n\n",
localaddrStr, fromlocalport, toaddrStr, toport, numwritten,
socktype==RESTSVC_CIENTSOCK?"client":"server",
fromaddrStr, fromport, restsvc_proxies[proxyidx].proxyid
);
}
u_short find_or_create_locsvc_listener(struct in_addr servertoaddr, u_short servertoport, struct in_addr listenaddr)
{
char serveraddrStr[255];
char localaddrStr[255];
time_t now = time(NULL);
int i= 0;
// Look for an existing proxy for this destination host ip:port
while (i < num_locatorsvc_listeners) {
if (locatorsvc_listeners[i].expirytime < now) {
inet_ntoa2(locatorsvc_listeners[i].serveraddr, serveraddrStr, sizeof(serveraddrStr));
inet_ntoa2(locatorsvc_listeners[i].localaddr, localaddrStr, sizeof(localaddrStr));
DPRINT2(" _Expire LocatorSvc listener [id=%u] for proxy to %s:%d on local address %s:%d. %d proxies left\n",
locatorsvc_listeners[i].listenerid,
serveraddrStr, locatorsvc_listeners[i].serverport,
localaddrStr, locatorsvc_listeners[i].localport,
num_locatorsvc_listeners-1
);
close(locatorsvc_listeners[i].sock);
memcpy(locatorsvc_listeners+i, locatorsvc_listeners+(--num_locatorsvc_listeners), sizeof(*locatorsvc_listeners));
continue;
}
if( (locatorsvc_listeners[i].serveraddr.s_addr == servertoaddr.s_addr) &&
(locatorsvc_listeners[i].serverport == servertoport) &&
(locatorsvc_listeners[i].localaddr.s_addr == listenaddr.s_addr)) {
inet_ntoa2(locatorsvc_listeners[i].serveraddr, serveraddrStr, sizeof(serveraddrStr));
inet_ntoa2(locatorsvc_listeners[i].localaddr, localaddrStr, sizeof(localaddrStr));
DPRINT(" Found existing LocatorSvc listener [id=%u] for proxy to %s:%d on local address %s:%d.\n",
locatorsvc_listeners[i].listenerid,
serveraddrStr, locatorsvc_listeners[i].serverport,
localaddrStr, locatorsvc_listeners[i].localport
);
locatorsvc_listeners[i].expirytime = now+LOCATOR_LISTENER_EXPIRY; // Update expiry time
return locatorsvc_listeners[i].localport;
}
i++;
}
// Add new proxy because there is no existing match
if(num_locatorsvc_listeners == MAX_LOCATOR_LISTENER) {
DPRINT("Can't add new LocatorSvc listener - maximum number of listeners reached\n\n");
return 0;
}
int newsock;
u_short localport;
if((newsock=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("socket (LocatorSvc listener)");
return 0;
};
if ((localport = get_sock_local_port(newsock, listenaddr.s_addr,"LocatorSvc listener")) == 0) {
close(newsock);
return 0;
}
if(listen(newsock, 3) < 0) {
perror("listen (LocatorSvc listener)");
close(newsock);
return 0;
}
locatorsvc_listeners[num_locatorsvc_listeners].expirytime = now+LOCATOR_LISTENER_EXPIRY;
locatorsvc_listeners[num_locatorsvc_listeners].listenerid = next_locatorsvc_listenerid++;
locatorsvc_listeners[num_locatorsvc_listeners].serveraddr = servertoaddr;
locatorsvc_listeners[num_locatorsvc_listeners].serverport = servertoport;
locatorsvc_listeners[num_locatorsvc_listeners].sock = newsock;
locatorsvc_listeners[num_locatorsvc_listeners].localaddr = listenaddr;
locatorsvc_listeners[num_locatorsvc_listeners].localport = localport;
num_locatorsvc_listeners++;
inet_ntoa2(servertoaddr, serveraddrStr, sizeof(serveraddrStr));
inet_ntoa2(listenaddr, localaddrStr, sizeof(localaddrStr));
DPRINT(" Created LocatorSvc listener [id=%u] for proxy to %s:%d on local address %s:%d. Total proxies: %d\n",
locatorsvc_listeners[num_locatorsvc_listeners-1].listenerid,
serveraddrStr, servertoport,
localaddrStr, localport, num_locatorsvc_listeners
);
return localport;
}
void handle_loc_services_accept (int listerneridx)
{
int serversock;
int clientsock;
struct sockaddr_in clientaddr;
struct sockaddr_in serveraddr;
socklen_t clientaddrlen = sizeof(clientaddr);
char clientaddrStr[255];
char serveraddrStr[255];
if ((clientsock = accept(locatorsvc_listeners[listerneridx].sock, (struct sockaddr *)&clientaddr,
&clientaddrlen)) < 0)
{
perror("accept (LocatorSvc proxy)");
return;
}
int flags;
if ((flags = fcntl(clientsock, F_GETFL, 0)) < 0) {
flags = 0;
}
if (fcntl(clientsock, F_SETFL, flags | O_NONBLOCK) < 0)
{
perror("accept (LocatorSvc proxy)");
}
inet_ntoa2(clientaddr.sin_addr, clientaddrStr, sizeof(clientaddrStr));
DPRINT("LocatorSvc proxy - accepted connection from client %s:%d\n",
clientaddrStr, clientaddr.sin_port
);