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code cleanup

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This commit is contained in:
Matthias Cramer
2025-03-26 21:27:18 +01:00
parent 038a6de68e
commit 1233bf5ede
1 changed files with 1 additions and 42 deletions
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43
main.c
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@@ -14,6 +14,7 @@ Copyright (c) 2025, Matthias Cramer, cramer@freestone.net
#include <arpa/inet.h> #include <arpa/inet.h>
#include <string.h> #include <string.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h> #include <netdb.h>
#include <netinet/in.h> #include <netinet/in.h>
#include <unistd.h> #include <unistd.h>
@@ -61,7 +62,6 @@ void list_interfaces() {
pcap_freealldevs(alldevs); pcap_freealldevs(alldevs);
} }
void print_usage(const char *program_name) { void print_usage(const char *program_name) {
printf("Usage: %s [options]\n", program_name); printf("Usage: %s [options]\n", program_name);
printf("Options:\n"); printf("Options:\n");
@@ -79,7 +79,6 @@ void print_usage(const char *program_name) {
} }
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
pcap_if_t *alldevs;
char errbuf[PCAP_ERRBUF_SIZE]; char errbuf[PCAP_ERRBUF_SIZE];
char *filter_exp = "tcp port 8088"; // Default filter char *filter_exp = "tcp port 8088"; // Default filter
char *dev_name = NULL; // Device name char *dev_name = NULL; // Device name
@@ -201,34 +200,6 @@ int main(int argc, char *argv[]) {
printf("Resolved Destination IP: %s\n", resolved_ip); printf("Resolved Destination IP: %s\n", resolved_ip);
printf("Destination Port: %d\n", dest_port); printf("Destination Port: %d\n", dest_port);
// If no interface is specified, find all devices
if (dev_name == NULL) {
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
fprintf(stderr, "Error in pcap_findalldevs: %s\n", errbuf);
return(1);
}
if (list_interfaces_flag) {
pcap_if_t *device;
printf("Available devices:\n");
for (device = alldevs; device != NULL; device = device->next) {
printf("%s - %s\n", device->name, (device->description != NULL) ? device->description : "No description available");
}
}
// Use the first device if no device is specified
if (alldevs == NULL) {
fprintf(stderr, "No devices found. Make sure you have permissions to capture traffic.\n");
return 1;
}
dev_name = alldevs->name; // Use the name of the first device
} else {
// Interface specified via command line, no need to find all devices
alldevs = NULL; // Set alldevs to NULL to avoid potential issues
}
pcap_t *handle; pcap_t *handle;
struct bpf_program fp; struct bpf_program fp;
bpf_u_int32 mask; bpf_u_int32 mask;
@@ -243,26 +214,17 @@ int main(int argc, char *argv[]) {
handle = pcap_open_live(dev_name, BUFSIZ, 1, 1000, errbuf); handle = pcap_open_live(dev_name, BUFSIZ, 1, 1000, errbuf);
if (handle == NULL) { if (handle == NULL) {
fprintf(stderr, "Couldn't open device %s: %s\n", dev_name, errbuf); fprintf(stderr, "Couldn't open device %s: %s\n", dev_name, errbuf);
if (alldevs != NULL) {
pcap_freealldevs(alldevs);
}
return(2); return(2);
} }
if (pcap_compile(handle, &fp, filter_exp, 1, net) == -1) { if (pcap_compile(handle, &fp, filter_exp, 1, net) == -1) {
fprintf(stderr, "Couldn't parse filter %s: %s\n", filter_exp, pcap_geterr(handle)); fprintf(stderr, "Couldn't parse filter %s: %s\n", filter_exp, pcap_geterr(handle));
if (alldevs != NULL) {
pcap_freealldevs(alldevs);
}
pcap_close(handle); pcap_close(handle);
return(2); return(2);
} }
if (pcap_setfilter(handle, &fp) == -1) { if (pcap_setfilter(handle, &fp) == -1) {
fprintf(stderr, "Couldn't install filter %s: %s\n", filter_exp, pcap_geterr(handle)); fprintf(stderr, "Couldn't install filter %s: %s\n", filter_exp, pcap_geterr(handle));
if (alldevs != NULL) {
pcap_freealldevs(alldevs);
}
pcap_close(handle); pcap_close(handle);
return(2); return(2);
} }
@@ -343,9 +305,6 @@ int main(int argc, char *argv[]) {
pcap_freecode(&fp); pcap_freecode(&fp);
pcap_close(handle); pcap_close(handle);
if (alldevs != NULL) {
pcap_freealldevs(alldevs); // Free the device list only if devices were found
}
close(sockfd); close(sockfd);
return(0); return(0);
} }