#define MAX(x,y) (x>y ? x : y)
+/*Structure for simpler IPv4/IPv6 Address handling*/
typedef union ipaddr{
struct sockaddr *gen;
struct sockaddr_in *ipv4;
struct sockaddr_in6 *ipv6;
} ipaddr_ptr_t;
+enum responses{
+ UNKNOWN=0,
+ RESET,
+ RESPONSE,
+ SYNC,
+ DEST_UNREACHABLE,
+ TTL_EXPIRATION,
+ TOO_BIG,
+ PARAMETER_PROBLEM
+};
+char* response_label[]= {
+"Unknown",
+"Closed Port (Reset)",
+"Open Port (Response)",
+"Open Port (Sync)",
+"Destination Unreachable",
+"TTL Expiration",
+"Packet Too Big",
+"DCCP Not Supported (Parameter Problem)"
+};
+
+
+struct request{
+ int seq;
+ int num_replies;
+ int num_errors;
+ struct timeval sent;
+ struct timeval reply;
+ enum responses reply_type;
+ struct request *next;
+ struct request *prev;
+};
+
+struct stats{
+ int requests_sent;
+ int replies_received;
+ int errors;
+ double rtt_min;
+ double rtt_avg;
+ double rtt_max;
+ struct timeval start;
+ struct timeval stop;
+};
+
+struct request_queue{
+ struct request *head;
+ struct request *tail;
+};
+
int debug=0; /*set to 1 to turn on debugging information*/
int count=-1; /*Default number of pings (-1 is infinity)*/
int ttl=64; /*Default TTL*/
long interval=1000; /*Default delay between pings in ms*/
int ip_type=AF_UNSPEC; /*IPv4 or IPv6*/
-ipaddr_ptr_t dest_addr;
-ipaddr_ptr_t src_addr;
+ipaddr_ptr_t dest_addr; /*Destination Address*/
+ipaddr_ptr_t src_addr; /*Source Address*/
+struct request_queue queue;
+struct stats ping_stats;
extern int errno;
void handleDCCPpacket(int rcv_socket, int send_socket);
void handleICMP4packet(int rcv_socket);
void handleICMP6packet(int rcv_socket);
-void buildRequestPacket(unsigned char* buffer, int *len);
-void updateRequestPacket(unsigned char* buffer, int *len);
+void buildRequestPacket(unsigned char* buffer, int *len, int seq);
+void updateRequestPacket(unsigned char* buffer, int *len, int seq);
+int logPacket(int seq);
+int logResponse(ipaddr_ptr_t *src, int seq, int type);
void dbgprintf(int level, const char *fmt, ...);
void sanitize_environment();
void usage();
char c;
char *src=NULL;
char *dst=NULL;
-
+ queue.head=NULL;
+ queue.tail=NULL;
+ ping_stats.replies_received=0;
+ ping_stats.requests_sent=0;
+ ping_stats.rtt_avg=0;
+ ping_stats.rtt_max=0;
+ ping_stats.rtt_min=0;
+ ping_stats.errors=0;
sanitize_environment();
struct timeval timeout;
struct timeval t,delay, add;
char pbuf[1000];
+ int seq=1;
/*Open Sockets*/
rs=socket(ip_type, SOCK_RAW ,IPPROTO_RAW);
/*Build DCCP packet*/
- buildRequestPacket(sbuffer,&slen);
+ buildRequestPacket(sbuffer,&slen,seq);
if(ip_type==AF_INET){
addrlen=sizeof(struct sockaddr_in);
}else{
addrlen=sizeof(struct sockaddr_in6);
}
+ /*Start Message*/
+ if(ip_type==AF_INET){
+ dbgprintf(0, "PINGING %s on DCCP port %i\n",
+ inet_ntop(ip_type, (void*)&dest_addr.ipv4->sin_addr, pbuf, 1000),dest_port);
+ }else{
+ dbgprintf(0, "PINGING %s on DCCP port %i\n",
+ inet_ntop(ip_type, (void*)&dest_addr.ipv6->sin6_addr, pbuf, 1000),dest_port);
+ }
+
while(!done){
/*Send Ping*/
if(sendto(rs, &sbuffer, slen, MSG_DONTWAIT,(struct sockaddr*)dest_addr.gen,addrlen)<0){
dbgprintf(0,"Error: sendto failed\n");
}
+ if (logPacket(seq)<0){
+ dbgprintf(0,"Error: Couldn't record request!\n");
+ }
if(ip_type==AF_INET){
- dbgprintf(0, "Sending DCCP Request to %s\n",inet_ntop(ip_type, (void*)&dest_addr.ipv4->sin_addr, pbuf, 1000));
+ dbgprintf(1, "Sending DCCP Request to %s\n",inet_ntop(ip_type, (void*)&dest_addr.ipv4->sin_addr, pbuf, 1000));
}else{
- dbgprintf(0, "Sending DCCP Request to %s\n",inet_ntop(ip_type, (void*)&dest_addr.ipv6->sin6_addr, pbuf, 1000));
+ dbgprintf(1, "Sending DCCP Request to %s\n",inet_ntop(ip_type, (void*)&dest_addr.ipv6->sin6_addr, pbuf, 1000));
}
/*Use select to wait on packets or until interval has passed*/
done=1;
break;
}
-
- updateRequestPacket(sbuffer,&slen);
+ seq++;
+ updateRequestPacket(sbuffer,&slen, seq);
}
close(rs);
void handleDCCPpacket(int rcv_socket, int send_socket){
int rlen=1500;
unsigned char rbuffer[rlen];
- char pbuf[1000];
ipaddr_ptr_t rcv_addr;
socklen_t rcv_addr_len;
struct dccp_hdr *dhdr;
+ struct dccp_hdr_reset *dhdr_re;
+ struct dccp_hdr_response *dhdr_rp;
+ struct dccp_hdr_ack_bits *dhdr_sync;
unsigned char* ptr;
struct iphdr* iph;
return;
}
- /*Print Message*/
+ /*Pick Response*/
if(dhdr->dccph_type==DCCP_PKT_RESET){
- /*Print Message*/
- if(ip_type==AF_INET){
- dbgprintf(0, "Got DCCP RESET from %s\n",inet_ntop(ip_type, (void*)&rcv_addr.ipv4->sin_addr, pbuf, 1000));
- }else{
- dbgprintf(0, "Got DCCP RESET from %s\n",inet_ntop(ip_type, (void*)&rcv_addr.ipv6->sin6_addr, pbuf, 1000));
+ if(rlen < (ptr-rbuffer)+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext)+sizeof(struct dccp_hdr_reset)){
+ dbgprintf(1, "Error: Reset packet too small!");
+ return;
}
+ dhdr_re=(struct dccp_hdr_reset*)(ptr+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext));
+ logResponse(&rcv_addr, ntohl(dhdr_re->dccph_reset_ack.dccph_ack_nr_low), RESET);
/*Nothing else to do*/
}
if(dhdr->dccph_type==DCCP_PKT_RESPONSE){
- /*Print Message*/
- if(ip_type==AF_INET){
- dbgprintf(0, "Got DCCP RESPONSE from %s\n",inet_ntop(ip_type, (void*)&rcv_addr.ipv4->sin_addr, pbuf, 1000));
- }else{
- dbgprintf(0, "Got DCCP RESPONSE from %s\n",inet_ntop(ip_type, (void*)&rcv_addr.ipv6->sin6_addr, pbuf, 1000));
+ if(rlen < (ptr-rbuffer)+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext)+sizeof(struct dccp_hdr_response)){
+ dbgprintf(1, "Error: Response packet too small!");
+ return;
}
- /*Send Close back*/
+ dhdr_rp=(struct dccp_hdr_response*)(ptr+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext));
+ logResponse(&rcv_addr,ntohl(dhdr_rp->dccph_resp_ack.dccph_ack_nr_low),RESPONSE);
+ /*TODO:Send Close back*/
}
if(dhdr->dccph_type==DCCP_PKT_SYNC || dhdr->dccph_type==DCCP_PKT_SYNCACK){
- /*Print Message*/
- if(ip_type==AF_INET){
- dbgprintf(0, "Got DCCP SYNC from %s\n",inet_ntop(ip_type, (void*)&rcv_addr.ipv4->sin_addr, pbuf, 1000));
- }else{
- dbgprintf(0, "Got DCCP SYNC from %s\n",inet_ntop(ip_type, (void*)&rcv_addr.ipv6->sin6_addr, pbuf, 1000));
+ if(rlen < (ptr-rbuffer)+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext)+sizeof(struct dccp_hdr_ack_bits)){
+ dbgprintf(1, "Error: Response packet too small!");
+ return;
}
- /*Send Reset*/
+ dhdr_sync=(struct dccp_hdr_ack_bits*)(ptr+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext));
+ logResponse(&rcv_addr,ntohl(dhdr_sync->dccph_ack_nr_low),SYNC);
+ /*TODO:Send Reset*/
}
free(rcv_addr.gen);
void handleICMP4packet(int rcv_socket){
int rlen=1500;
unsigned char rbuffer[rlen];
- char pbuf[1000];
- struct sockaddr_in rcv_addr;
- socklen_t rcv_addr_len=sizeof(struct sockaddr_in);
+ ipaddr_ptr_t rcv_addr;
+ socklen_t rcv_addr_len;
struct icmphdr *icmp4;
+ struct dccp_hdr *dhdr;
+ struct dccp_hdr_ext *dhdre;
+ struct iphdr* ip4hdr;
+ int type;
+
+ /*Memory for socket address*/
+ rcv_addr_len=sizeof(struct sockaddr_storage);
+ rcv_addr.gen=malloc(rcv_addr_len);
+ if(rcv_addr.gen==NULL){
+ dbgprintf(0,"Error: Can't Allocate Memory!\n");
+ exit(1);
+ }
/*Receive Packet*/
- if((rlen=recvfrom(rcv_socket, &rbuffer, 1000,0,(struct sockaddr*)&rcv_addr,&rcv_addr_len))<0){
+ if((rlen=recvfrom(rcv_socket, &rbuffer, 1000,0,rcv_addr.gen,&rcv_addr_len))<0){
dbgprintf(0, "Error on receive from ICMPv4 socket (%s)\n",strerror(errno));
}
if(rlen < sizeof(struct icmphdr)){ //check packet size
dbgprintf(1, "Packet smaller than possible ICMPv4 packet!\n");
+ free(rcv_addr.gen);
return;
}
icmp4=(struct icmphdr*)rbuffer;
- if(icmp4->type!=3 && icmp4->type!=11){ //check icmp types
+ if(icmp4->type!=ICMP_DEST_UNREACH && icmp4->type!=ICMP_TIME_EXCEEDED){ //check icmp types
dbgprintf(1, "Tossing ICMPv4 packet of type %i\n", icmp4->type);
+ free(rcv_addr.gen);
return;
}
- /*Print Message*/
- dbgprintf(0, "Got ICMPv4 type %i from %s\n", icmp4->type,
- inet_ntop(ip_type, (void*)&rcv_addr.sin_addr, pbuf, 1000));
+ /*Check packet size again*/
+ if(rlen<sizeof(struct icmphdr)+sizeof(struct iphdr)+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext)){
+ dbgprintf(1, "Tossing ICMPv4 packet that's too small to contain DCCP header!\n");
+ free(rcv_addr.gen);
+ return;
+ }
+
+ /*Decode IPv4 header*/
+ ip4hdr=(struct iphdr*)(rbuffer+sizeof(struct icmphdr));
+ if(memcmp(&src_addr.ipv4->sin_addr,&ip4hdr->saddr,sizeof(src_addr.ipv4->sin_addr))!=0){
+ /*Source address doesn't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ if(memcmp(&dest_addr.ipv4->sin_addr,&ip4hdr->daddr,sizeof(dest_addr.ipv4->sin_addr))!=0){
+ /*Destination address doesn't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ if(ip4hdr->protocol!=IPPROTO_DCCP){
+ /*Not DCCP!*/
+ free(rcv_addr.gen);
+ return;
+ }
+
+ /*Decode DCCP header*/
+ dhdr=(struct dccp_hdr*)(rbuffer+sizeof(struct icmphdr)+ip4hdr->ihl*4);
+ if(dhdr->dccph_dport!=htons(dest_port)){
+ /*DCCP Destination Ports don't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ if(dhdr->dccph_sport!=htons(dest_port)){
+ /*DCCP Source Ports don't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ dhdre=(struct dccp_hdr_ext*)(rbuffer+sizeof(struct icmphdr)+ip4hdr->ihl*4+sizeof(struct dccp_hdr));
+
+ /*Log*/
+ if(icmp4->type==ICMP_DEST_UNREACH){
+ type=DEST_UNREACHABLE;
+ }
+ if(icmp4->type==ICMP_TIME_EXCEEDED){
+ type=TTL_EXPIRATION;
+ }
+ logResponse(&rcv_addr,ntohl(dhdre->dccph_seq_low),type);
+ free(rcv_addr.gen);
+ return;
}
void handleICMP6packet(int rcv_socket){
int rlen=1500;
unsigned char rbuffer[rlen];
- char pbuf[1000];
- struct sockaddr_in6 rcv_addr;
- socklen_t rcv_addr_len=sizeof(struct sockaddr_in6);
+ ipaddr_ptr_t rcv_addr;
+ socklen_t rcv_addr_len;
struct icmp6_hdr *icmp6;
+ struct ip6_hdr* ip6hdr;
+ struct dccp_hdr *dhdr;
+ struct dccp_hdr_ext *dhdre;
+ int type;
+
+ /*Memory for socket address*/
+ rcv_addr_len=sizeof(struct sockaddr_storage);
+ rcv_addr.gen=malloc(rcv_addr_len);
+ if(rcv_addr.gen==NULL){
+ dbgprintf(0,"Error: Can't Allocate Memory!\n");
+ exit(1);
+ }
/*Receive Packet*/
- if((rlen=recvfrom(rcv_socket, &rbuffer, 1000,0,(struct sockaddr*)&rcv_addr,&rcv_addr_len))<0){
+ if((rlen=recvfrom(rcv_socket, &rbuffer, 1000,0,rcv_addr.gen,&rcv_addr_len))<0){
dbgprintf(0, "Error on receive from ICMPv6 socket (%s)\n",strerror(errno));
}
if(rlen < sizeof(struct icmp6_hdr)){ //check packet size
dbgprintf(1, "Packet smaller than possible ICMPv6 packet!\n");
+ free(rcv_addr.gen);
return;
}
icmp6=(struct icmp6_hdr*)rbuffer;
- if(icmp6->icmp6_type!=1 && icmp6->icmp6_type!=2 && icmp6->icmp6_type!=3
- && icmp6->icmp6_type!=4){ //check icmp types
+ if(icmp6->icmp6_type!=ICMP6_DST_UNREACH && icmp6->icmp6_type!=ICMP6_PACKET_TOO_BIG
+ && icmp6->icmp6_type!=ICMP6_TIME_EXCEEDED && icmp6->icmp6_type!=ICMP6_PARAM_PROB){ //check icmp types
dbgprintf(1, "Tossing ICMPv6 packet of type %i\n", icmp6->icmp6_type);
+ free(rcv_addr.gen);
return;
}
- /*Print Message*/
- dbgprintf(0, "Got ICMPv6 type %i from %s\n", icmp6->icmp6_type,
- inet_ntop(ip_type, (void*)&rcv_addr.sin6_addr, pbuf, 1000));
+ /*Check packet size again*/
+ if(rlen<sizeof(struct icmp6_hdr)+sizeof(struct ip6_hdr)+sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext)){
+ dbgprintf(1, "Tossing ICMPv6 packet that's too small to contain DCCP header!\n");
+ free(rcv_addr.gen);
+ return;
+ }
+
+ /*Decode IPv6 header*/
+ ip6hdr=(struct ip6_hdr*)(rbuffer+sizeof(struct icmp6_hdr));
+ if(memcmp(&src_addr.ipv6->sin6_addr,&ip6hdr->ip6_src,sizeof(src_addr.ipv6->sin6_addr))!=0){
+ /*Source address doesn't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ if(memcmp(&dest_addr.ipv6->sin6_addr,&ip6hdr->ip6_dst,sizeof(dest_addr.ipv6->sin6_addr))!=0){
+ /*Destination address doesn't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ if(ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_nxt!=IPPROTO_DCCP){
+ /*Not DCCP!*/
+ free(rcv_addr.gen);
+ return;
+ }
+
+ /*Decode DCCP header*/
+ dhdr=(struct dccp_hdr*)(rbuffer+sizeof(struct icmp6_hdr)+sizeof(struct ip6_hdr));
+ if(dhdr->dccph_dport!=htons(dest_port)){
+ /*DCCP Destination Ports don't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ if(dhdr->dccph_sport!=htons(dest_port)){
+ /*DCCP Source Ports don't match*/
+ free(rcv_addr.gen);
+ return;
+ }
+ dhdre=(struct dccp_hdr_ext*)(rbuffer+sizeof(struct icmp6_hdr)+sizeof(struct ip6_hdr)+sizeof(struct dccp_hdr));
+
+
+
+ /*Log*/
+ if(icmp6->icmp6_type==ICMP6_DST_UNREACH){
+ type=DEST_UNREACHABLE;
+ }
+ if(icmp6->icmp6_type==ICMP6_PACKET_TOO_BIG){
+ type=TOO_BIG;
+ }
+ if(icmp6->icmp6_type==ICMP6_TIME_EXCEEDED){
+ type=TTL_EXPIRATION;
+ }
+ if(icmp6->icmp6_type==ICMP6_PARAM_PROB){
+ type=PARAMETER_PROBLEM;
+ }
+ logResponse(&rcv_addr,ntohl(dhdre->dccph_seq_low),type);
+ free(rcv_addr.gen);
+ return;
}
-void buildRequestPacket(unsigned char* buffer, int *len){
+void buildRequestPacket(unsigned char* buffer, int *len, int seq){
struct dccp_hdr *dhdr;
struct dccp_hdr_ext *dhdre;
struct dccp_hdr_request *dhdrr;
int ip_hdr_len;
int dccp_hdr_len=sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext)+sizeof(struct dccp_hdr_request);
- int seq=8;
if(*len < dccp_hdr_len+sizeof(struct ip6_hdr)){
dbgprintf(0, "Error: Insufficient buffer space\n");
return;
}
-void updateRequestPacket(unsigned char* buffer, int *len){
+void updateRequestPacket(unsigned char* buffer, int *len, int seq){
struct dccp_hdr *dhdr;
struct dccp_hdr_ext *dhdre;
struct iphdr* ip4hdr;
int ip_hdr_len;
int dccp_hdr_len=sizeof(struct dccp_hdr)+sizeof(struct dccp_hdr_ext)+sizeof(struct dccp_hdr_request);
- int tmp;
/*IP header*/
ip4hdr=NULL;
ip_hdr_len=sizeof(struct iphdr);
ip4hdr=(struct iphdr*)buffer;
ip4hdr->check=htons(0);
- tmp=ntohs(ip4hdr->id);
- ip4hdr->id=htons(tmp+1);
+ ip4hdr->id=htons(seq);
}else{
ip_hdr_len=sizeof(struct ip6_hdr);
}
dhdr=(struct dccp_hdr*)(buffer+ip_hdr_len);
dhdre=(struct dccp_hdr_ext*)(buffer+ip_hdr_len+sizeof(struct dccp_hdr));
dhdr->dccph_checksum=0;
- tmp=ntohl(dhdre->dccph_seq_low);
- dhdre->dccph_seq_low=htonl(tmp+1);
+ dhdre->dccph_seq_low=htonl(seq);
/*Checksums*/
if(ip_type==AF_INET){
return;
}
+int logPacket(int seq){
+ struct request *tmp;
+
+ /*Add new request to queue*/
+ tmp=malloc(sizeof(struct request));
+ if(tmp==NULL){
+ dbgprintf(0,"Error: Can't allocate Memory!\n");
+ exit(1);
+ }
+ tmp->next=NULL;
+ tmp->prev=NULL;
+ tmp->num_replies=0;
+ tmp->num_errors=0;
+ tmp->seq=seq;
+ tmp->reply_type=UNKNOWN;
+ gettimeofday(&tmp->sent,NULL);
+
+ if(queue.head==NULL){
+ queue.head=queue.tail=tmp;
+ return 0;
+ }
+ queue.head->prev=tmp;
+ tmp->next=queue.head;
+ queue.head=tmp;
+
+ /*Update Statistics*/
+ if(ping_stats.requests_sent==0){
+ gettimeofday(&ping_stats.start,NULL);
+ }
+ ping_stats.requests_sent++;
+ return 0;
+}
+
+int logResponse(ipaddr_ptr_t *src, int seq, int type){
+ struct request *cur;
+ double diff;
+ char pbuf[1000];
+
+ if(queue.tail==NULL){
+ dbgprintf(1,"Response received but no requests sent!\n");
+ return -1;
+ }
+
+ /*Locate request*/
+ cur=queue.tail;
+ while(cur!=NULL){
+ if(cur->seq==seq){
+ gettimeofday(&cur->reply,NULL);
+ if(type<DEST_UNREACHABLE && type!=UNKNOWN){
+ cur->num_replies++;
+ }else{
+ cur->num_errors++;
+ }
+ cur->reply_type=type;
+ break;
+ }
+ cur=cur->prev;
+ }
+
+ if(cur==NULL){
+ dbgprintf(1,"Response received but no requests sent with sequence number %i!\n", seq);
+ return -1;
+ }
+
+ diff=(cur->reply.tv_usec + 1000000*cur->reply.tv_sec) - (cur->sent.tv_usec + 1000000*cur->sent.tv_sec);
+ diff=diff/1000.0;
+
+ /*Print Message*/
+ if(type<DEST_UNREACHABLE && type!=UNKNOWN){
+ if(ip_type==AF_INET){
+ dbgprintf(0, "Response from %s : seq=%i time=%.1fms status=%s\n",
+ inet_ntop(ip_type, (void*)&src->ipv4->sin_addr, pbuf, 1000),
+ seq, diff,response_label[type]);
+ }else{
+ dbgprintf(0, "Response from %s : seq=%i time=%.1fms status=%s\n",
+ inet_ntop(ip_type, (void*)&src->ipv6->sin6_addr, pbuf, 1000),
+ seq, diff,response_label[type]);
+ }
+ }else{
+ if(ip_type==AF_INET){
+ dbgprintf(0, "%s from %s : seq=%i\n",response_label[type],
+ inet_ntop(ip_type, (void*)&src->ipv4->sin_addr, pbuf, 1000),
+ seq);
+ }else{
+ dbgprintf(0, "%s from %s : seq=%i\n",response_label[type],
+ inet_ntop(ip_type, (void*)&src->ipv6->sin6_addr, pbuf, 1000),
+ seq);
+ }
+ }
+
+ /*Update statistics*/
+ if(type<DEST_UNREACHABLE && type!=UNKNOWN){
+ /*Good Response*/
+ ping_stats.rtt_avg=((ping_stats.replies_received*ping_stats.rtt_avg)+(diff))/(ping_stats.replies_received+1);
+ ping_stats.replies_received++;
+ if(diff < ping_stats.rtt_min){
+ ping_stats.rtt_min=diff;
+ }
+ if(diff > ping_stats.rtt_max){
+ ping_stats.rtt_max=diff;
+ }
+ }else{
+ /*Error*/
+ cur->num_errors++;
+ }
+ gettimeofday(&ping_stats.stop,NULL);
+ return 0;
+}
+
/*Usage information for program*/
void usage()
{
projects / dccpping / blobdiff