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additional parameters

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This commit is contained in:
Matthias Cramer
2025-04-03 20:39:31 +02:00
parent 87d74f0db9
commit 9fcac378ae
3 changed files with 38 additions and 2 deletions
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28
main.c
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@@ -126,6 +126,9 @@ void print_usage(const char *program_name) {
printf(" -f <filter> Specify the capture filter (BPF syntax)\n");
printf(" -r <host/ipv4/ipv6> Specify the destination host (required)\n");
printf(" -p <port> Specify the destination port (default: %d)\n", DEFAULT_DEST_PORT);
printf(" -e Use ERSPAN encapsulation (default: TZSP)\n");
printf(" -s <source_ip> Specify the source IP address (required for ERSPAN)\n");
printf(" -S <session_id> Specify the session ID (default: 42, must be between 0 and 1023)\n");
printf(" -4 Force IPv4 host lookup\n");
printf(" -6 Force IPv6 host lookup\n");
printf(" -l List available network interfaces\n");
@@ -153,6 +156,8 @@ int main(int argc, char *argv[]) {
unsigned long long int packet_count = 0; // Counter for matching packets (64bit)
int use_erspan = 0; // Flag for ERSPAN encapsulation
char *source_address = NULL; // Source IP address, default is NULL
uint32_t session_id = 42; // Session ID (10 bits)
// Socket variables
int sockfd;
@@ -196,6 +201,16 @@ int main(int argc, char *argv[]) {
verbose = 0; // Disable verbose mode if -c is set
} else if (strcmp(argv[i], "-e") == 0) {
use_erspan = 1; // Enable ERSPAN encapsulation
} else if (strcmp(argv[i], "-s") == 0 && i + 1 < argc) {
source_address = argv[i + 1]; // Set source IP from command line
i++; // Skip the source IP value
} else if (strcmp(argv[i], "-S") == 0 && i + 1 < argc) {
session_id = atoi(argv[i + 1]); // Set session ID from command line
if (session_id > 1023) { // Validate session ID (must fit in 10 bits)
fprintf(stderr, "Error: Session ID must be between 0 and 1023.\n");
return 1;
}
i++; // Skip the session ID value
}
}
@@ -448,8 +463,18 @@ int main(int argc, char *argv[]) {
ip_header.ip_off = 0; // Fragment offset
ip_header.ip_ttl = 64; // Time to live
ip_header.ip_p = IPPROTO_GRE; // Protocol (GRE)
ip_header.ip_src.s_addr = inet_addr("192.168.1.1"); // Replace with your source IP
ip_header.ip_dst.s_addr = ((struct sockaddr_in *)&dest_addr)->sin_addr.s_addr;
if (source_address != NULL) {
if (inet_pton(AF_INET, source_address, &(ip_header.ip_src)) != 1) {
fprintf(stderr, "Error: Invalid source IP address '%s'\n", source_address);
return 1;
}
} else {
ip_header.ip_src.s_addr = inet_addr("192.168.1.1"); // Default source IP
}
ip_header.ip_src.s_addr = inet_addr("192.168.1.1"); // Replace with your source IP
// Set GRE header fields
gre.flags = htons(0x1000); // GRE flags (S bit set for Sequence Number Present)
@@ -461,7 +486,6 @@ int main(int argc, char *argv[]) {
uint32_t cos = 5; // Class of Service (3 bits)
uint32_t en = 0; // Trunk Encapsulation Type (2 bit)
uint32_t t = 1; // Truncated (1 bit)
uint32_t session_id = 42; // Session ID (10 bits)
// Combine fields into the 32-bit ver_vlan_cos_en_t_session field
erspan.ver_vlan_cos_en_t_session =