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Added options to set destination ip and port #34

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7572cbb
Added cmd line options to set destination ip and port
Dec 7, 2023
20f9aa8
added help output
Dec 7, 2023
8702530
added help output
Dec 7, 2023
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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,8 @@ usage: udpreplay [-i iface] [-l] [-s speed] [-c millisec] [-r repeat] [-t ttl] p
-s speed replay speed relative to pcap timestamps
-t ttl packet ttl
-b enable broadcast (SO_BROADCAST)
-d ip destination ip address
-p port destination port number
```

## Example
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50 changes: 42 additions & 8 deletions src/udpreplay.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,13 @@ int main(int argc, char *argv[]) {
int ttl = -1;
int broadcast = 0;

sockaddr_in dest_addr;
memset(&dest_addr, 0, sizeof(dest_addr));
dest_addr.sin_family = AF_INET;

int opt;
while ((opt = getopt(argc, argv, "i:bls:c:r:t:")) != -1) {

while ((opt = getopt(argc, argv, "i:bls:c:r:t:d:p:")) != -1) {
switch (opt) {
case 'i':
ifindex = if_nametoindex(optarg);
Expand Down Expand Up @@ -63,6 +68,25 @@ int main(int argc, char *argv[]) {
return 1;
}
break;
case 'd':
// convert string to sockaddr_in
dest_addr.sin_addr.s_addr = inet_addr(optarg);
if (dest_addr.sin_addr.s_addr == INADDR_NONE) {
std::cerr << "Invalid IP address" << std::endl;
return 1;
}
break;
case 'p':
{
// convert string to port number
int port = atoi(optarg);
if (port < 0 || port > 65535) {
std::cerr << "Invalid port number" << std::endl;
return 1;
}
dest_addr.sin_port = htons(atoi(optarg));
break;
}
case 'b':
broadcast = 1;
break;
Expand All @@ -85,7 +109,9 @@ int main(int argc, char *argv[]) {
" -r repeat number of times to loop data (-1 for infinite loop)\n"
" -s speed replay speed relative to pcap timestamps\n"
" -t ttl packet ttl\n"
" -b enable broadcast (SO_BROADCAST)"
" -b enable broadcast (SO_BROADCAST)\n"
" -d ip destination ip address\n"
" -p port destination port number"
<< std::endl;
return 1;
}
Expand Down Expand Up @@ -247,14 +273,22 @@ int main(int argc, char *argv[]) {
sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
#ifdef __GLIBC__
addr.sin_port = udp->dest;
if (dest_addr.sin_port != 0) {
addr.sin_port = dest_addr.sin_port;
} else {
#ifdef __GLIBC__
addr.sin_port = udp->dest;
#else
addr.sin_port = udp->uh_dport;
addr.sin_port = udp->uh_dport;
#endif
addr.sin_addr = {ip->ip_dst};
auto n = sendto(fd, d, len, 0, reinterpret_cast<sockaddr *>(&addr),
sizeof(addr));
}

if (dest_addr.sin_addr.s_addr != 0) {
addr.sin_addr = dest_addr.sin_addr;
} else {
addr.sin_addr = {ip->ip_dst};
}
auto n = sendto(fd, d, len, 0, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
if (n != len) {
std::cerr << "sendto: " << strerror(errno) << std::endl;
return 1;
Expand Down