mirror of
https://github.com/pi-hole/FTL.git
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DL6ER
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/* Pi-hole: A black hole for Internet advertisements
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* (c) 2023 Pi-hole, LLC (https://pi-hole.net)
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* Network-wide ad blocking via your own hardware.
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*
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* FTL Engine
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* API Implementation /api/dhcp
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*
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* This file is copyright under the latest version of the EUPL.
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* Please see LICENSE file for your rights under this license. */
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#include "FTL.h"
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#include "webserver/http-common.h"
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#include "webserver/json_macros.h"
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#include "api.h"
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#include "config/dnsmasq_config.h"
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// rotate_files()
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#include "files.h"
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int api_dhcp_leases_GET(struct ftl_conn *api)
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{
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// Get DHCP leases
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cJSON *leases = JSON_NEW_ARRAY();
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cJSON *json = JSON_NEW_OBJECT();
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JSON_ADD_ITEM_TO_OBJECT(json, "leases", leases);
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FILE *fp = fopen(DHCPLEASESFILE, "r");
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if(fp == NULL)
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{
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// File does not exist or not readable, send empty array
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JSON_SEND_OBJECT(json);
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}
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char *line = NULL;
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size_t len = 0;
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ssize_t read;
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while((read = getline(&line, &len, fp)) != -1)
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{
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// Skip empty lines
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if(read == 0)
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continue;
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// Skip duid line
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if(strncmp(line, "duid", 4) == 0)
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continue;
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// Parse line
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unsigned long expires = 0;
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char hwaddr[18] = { 0 };
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char ip[INET_ADDRSTRLEN] = { 0 };
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char name[65] = { 0 };
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char clientid[765] = { 0 };
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const int ret = sscanf(line, "%lu %17s %15s %64s %764s", &expires, hwaddr, ip, name, clientid);
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// Skip invalid lines
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if(ret != 5)
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continue;
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// Create JSON object for this lease
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cJSON *lease = JSON_NEW_OBJECT();
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JSON_ADD_NUMBER_TO_OBJECT(lease, "expires", expires);
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JSON_COPY_STR_TO_OBJECT(lease, "hwaddr", hwaddr);
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JSON_COPY_STR_TO_OBJECT(lease, "ip", ip);
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JSON_COPY_STR_TO_OBJECT(lease, "name", name);
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JSON_COPY_STR_TO_OBJECT(lease, "clientid", clientid);
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// Add lease to array
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JSON_ADD_ITEM_TO_ARRAY(leases, lease);
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}
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free(line);
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fclose(fp);
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JSON_SEND_OBJECT(json);
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}
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// defined in dnsmasq_interface.c
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extern bool FTL_unlink_DHCP_lease(const char *ipaddr, const char **hint);
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// Delete DHCP leases
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int api_dhcp_leases_DELETE(struct ftl_conn *api)
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{
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// Validate input (must be a valid IPv4 address)
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struct sockaddr_in sa;
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if(api->item == NULL || strlen(api->item) == 0 || inet_pton(AF_INET, api->item, &(sa.sin_addr)) == 0)
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{
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// Send empty reply with code 204 No Content
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return send_json_error(api,
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400,
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"bad_request",
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"The provided IPv4 address is invalid",
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api->item);
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}
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// Delete lease
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log_debug(DEBUG_API, "Deleting DHCP lease for address %s", api->item);
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const char *hint = NULL;
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const bool found = FTL_unlink_DHCP_lease(api->item, &hint);
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if(!found && hint != NULL)
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{
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// Send error when something went wrong (hint is not NULL)
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return send_json_error(api,
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400,
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"bad_request",
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"Failed to delete DHCP lease",
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hint);
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}
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// Send empty reply with codes:
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// - 204 No Content (if a lease was deleted)
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// - 404 Not Found (if no lease was found)
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cJSON *json = JSON_NEW_OBJECT();
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JSON_SEND_OBJECT_CODE(json, found ? 204 : 404);
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}
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