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feat(ssdp): implement dynamic header extraction and logging #21

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feat(ssdp): implement dynamic header extraction and logging #21

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eb562f6
feat(ssdp): implement dynamic header extraction with bounds safety
GitHub-MasterX Mar 29, 2026
41dd7d2
fix(dynamic-header-extraction)
GitHub-MasterX Mar 29, 2026
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50 changes: 47 additions & 3 deletions servers/upnp_pit.c
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,48 @@ char* ssdpResponse() {
return responseBuffer;
}

// Logging the headers and their values
void extraction(char *pkt_buffer,char *log_msg){
char *current_pos=pkt_buffer;
char *nl = strchr(current_pos, '\n');
if (!nl) return;
current_pos = nl + 1;

while ((nl = strchr(current_pos, '\n')) != NULL){
if (*current_pos == '\r' || *current_pos == '\n') break;
if(*current_pos!=' '&& *current_pos != '\t'){
char *col = strchr(current_pos,':');
int current_line_len = nl - current_pos;
if (col != NULL && col < nl) {
int key_len = col - current_pos;
char key_name[64] = {0};
if (key_len > 0 && key_len < sizeof(key_name)) {
strncpy(key_name, current_pos, key_len);
key_name[key_len] = '\0';
}

char *val_ptr = col + 1;
while (*val_ptr == ' ') val_ptr++;

int val_len = 0;
while (val_ptr + val_len < nl &&
val_ptr[val_len] != '\r' &&
val_ptr[val_len] != '\n') {
val_len++;
}
if (val_len > 0) {
char fragment[512];
snprintf(fragment, sizeof(fragment), " | %s:%.*s", key_name, val_len, val_ptr);
if (strlen(log_msg) + strlen(fragment) < 1023) {
strcat(log_msg, fragment);
}
}
}
}
current_pos = nl + 1;
}
}

// Handles SSDP discovery requests and sends fake responses
void *ssdpListener(void *arg) {
(void)arg;
Expand Down Expand Up @@ -172,14 +214,16 @@ void *ssdpListener(void *arg) {
sendto(sockFd, response, strlen(response), 0,
(struct sockaddr *)&client_addr, sizeof(client_addr));

snprintf(msg, sizeof(msg), "%s M-SEARCH %s\n",
snprintf(msg, sizeof(msg), "%s M-SEARCH %s",
SERVER_ID, client_ip);
extraction(buffer,msg);
} else {
snprintf(msg, sizeof(msg), "%s non-M-SEARCH %s\n",
snprintf(msg, sizeof(msg), "%s non-M-SEARCH %s",
SERVER_ID, client_ip);
extraction(buffer,msg);
}

printf("%s", msg);
printf("%s\n", msg);
sendMetric(msg);
}

Expand Down