+++ /dev/null
-/*
- * files.c -- DHCP server file manipulation *
- * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
- */
-
-#include <sys/socket.h>
-#include <arpa/inet.h>
-#include <string.h>
-#include <stdlib.h>
-#include <time.h>
-#include <ctype.h>
-#include <netdb.h>
-
-#include <netinet/ether.h>
-#include "static_leases.h"
-
-#include "dhcpd.h"
-#include "files.h"
-#include "options.h"
-#include "common.h"
-
-/*
- * Domain names may have 254 chars, and string options can be 254
- * chars long. However, 80 bytes will be enough for most, and won't
- * hog up memory. If you have a special application, change it
- */
-#define READ_CONFIG_BUF_SIZE 80
-
-/* on these functions, make sure you datatype matches */
-static int read_ip(const char *line, void *arg)
-{
- struct in_addr *addr = arg;
- struct hostent *host;
- int retval = 1;
-
- if (!inet_aton(line, addr)) {
- if ((host = gethostbyname(line)))
- addr->s_addr = *((unsigned long *) host->h_addr_list[0]);
- else retval = 0;
- }
- return retval;
-}
-
-static int read_mac(const char *line, void *arg)
-{
- uint8_t *mac_bytes = arg;
- struct ether_addr *temp_ether_addr;
- int retval = 1;
-
- temp_ether_addr = ether_aton(line);
-
- if(temp_ether_addr == NULL)
- retval = 0;
- else
- memcpy(mac_bytes, temp_ether_addr, 6);
-
- return retval;
-}
-
-
-static int read_str(const char *line, void *arg)
-{
- char **dest = arg;
-
- if (*dest) free(*dest);
- *dest = strdup(line);
-
- return 1;
-}
-
-
-static int read_u32(const char *line, void *arg)
-{
- uint32_t *dest = arg;
- char *endptr;
- *dest = strtoul(line, &endptr, 0);
- return endptr[0] == '\0';
-}
-
-
-static int read_yn(const char *line, void *arg)
-{
- char *dest = arg;
- int retval = 1;
-
- if (!strcasecmp("yes", line))
- *dest = 1;
- else if (!strcasecmp("no", line))
- *dest = 0;
- else retval = 0;
-
- return retval;
-}
-
-
-/* read a dhcp option and add it to opt_list */
-static int read_opt(const char *const_line, void *arg)
-{
- struct option_set **opt_list = arg;
- char *opt, *val, *endptr;
- struct dhcp_option *option;
- int retval = 0, length;
- char buffer[8];
- char *line;
- uint16_t *result_u16 = (uint16_t *) buffer;
- uint32_t *result_u32 = (uint32_t *) buffer;
-
- /* Cheat, the only const line we'll actually get is "" */
- line = (char *) const_line;
- if (!(opt = strtok(line, " \t="))) return 0;
-
- for (option = dhcp_options; option->code; option++)
- if (!strcasecmp(option->name, opt))
- break;
-
- if (!option->code) return 0;
-
- do {
- if (!(val = strtok(NULL, ", \t"))) break;
- length = option_lengths[option->flags & TYPE_MASK];
- retval = 0;
- opt = buffer; /* new meaning for variable opt */
- switch (option->flags & TYPE_MASK) {
- case OPTION_IP:
- retval = read_ip(val, buffer);
- break;
- case OPTION_IP_PAIR:
- retval = read_ip(val, buffer);
- if (!(val = strtok(NULL, ", \t/-"))) retval = 0;
- if (retval) retval = read_ip(val, buffer + 4);
- break;
- case OPTION_STRING:
- length = strlen(val);
- if (length > 0) {
- if (length > 254) length = 254;
- opt = val;
- retval = 1;
- }
- break;
- case OPTION_BOOLEAN:
- retval = read_yn(val, buffer);
- break;
- case OPTION_U8:
- buffer[0] = strtoul(val, &endptr, 0);
- retval = (endptr[0] == '\0');
- break;
- case OPTION_U16:
- *result_u16 = htons(strtoul(val, &endptr, 0));
- retval = (endptr[0] == '\0');
- break;
- case OPTION_S16:
- *result_u16 = htons(strtol(val, &endptr, 0));
- retval = (endptr[0] == '\0');
- break;
- case OPTION_U32:
- *result_u32 = htonl(strtoul(val, &endptr, 0));
- retval = (endptr[0] == '\0');
- break;
- case OPTION_S32:
- *result_u32 = htonl(strtol(val, &endptr, 0));
- retval = (endptr[0] == '\0');
- break;
- default:
- break;
- }
- if (retval)
- attach_option(opt_list, option, opt, length);
- } while (retval && option->flags & OPTION_LIST);
- return retval;
-}
-
-static int read_staticlease(const char *const_line, void *arg)
-{
-
- char *line;
- char *mac_string;
- char *ip_string;
- uint8_t *mac_bytes;
- uint32_t *ip;
-
-
- /* Allocate memory for addresses */
- mac_bytes = xmalloc(sizeof(unsigned char) * 8);
- ip = xmalloc(sizeof(uint32_t));
-
- /* Read mac */
- line = (char *) const_line;
- mac_string = strtok(line, " \t");
- read_mac(mac_string, mac_bytes);
-
- /* Read ip */
- ip_string = strtok(NULL, " \t");
- read_ip(ip_string, ip);
-
- addStaticLease(arg, mac_bytes, ip);
-
-#ifdef UDHCP_DEBUG
- printStaticLeases(arg);
-#endif
-
- return 1;
-
-}
-
-
-static const struct config_keyword keywords[] = {
- /* keyword handler variable address default */
- {"start", read_ip, &(server_config.start), "192.168.0.20"},
- {"end", read_ip, &(server_config.end), "192.168.0.254"},
- {"interface", read_str, &(server_config.interface), "eth0"},
- {"option", read_opt, &(server_config.options), ""},
- {"opt", read_opt, &(server_config.options), ""},
- {"max_leases", read_u32, &(server_config.max_leases), "254"},
- {"remaining", read_yn, &(server_config.remaining), "yes"},
- {"auto_time", read_u32, &(server_config.auto_time), "7200"},
- {"decline_time",read_u32, &(server_config.decline_time),"3600"},
- {"conflict_time",read_u32,&(server_config.conflict_time),"3600"},
- {"offer_time", read_u32, &(server_config.offer_time), "60"},
- {"min_lease", read_u32, &(server_config.min_lease), "60"},
- {"lease_file", read_str, &(server_config.lease_file), LEASES_FILE},
- {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
- {"notify_file", read_str, &(server_config.notify_file), ""},
- {"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"},
- {"sname", read_str, &(server_config.sname), ""},
- {"boot_file", read_str, &(server_config.boot_file), ""},
- {"static_lease",read_staticlease, &(server_config.static_leases), ""},
- /*ADDME: static lease */
- {"", NULL, NULL, ""}
-};
-
-
-int read_config(const char *file)
-{
- FILE *in;
- char buffer[READ_CONFIG_BUF_SIZE], *token, *line;
-#ifdef UDHCP_DEBUG
- char orig[READ_CONFIG_BUF_SIZE];
-#endif
- int i, lm = 0;
-
- for (i = 0; keywords[i].keyword[0]; i++)
- if (keywords[i].def[0])
- keywords[i].handler(keywords[i].def, keywords[i].var);
-
- if (!(in = fopen(file, "r"))) {
- LOG(LOG_ERR, "unable to open config file: %s", file);
- return 0;
- }
-
- while (fgets(buffer, READ_CONFIG_BUF_SIZE, in)) {
- lm++;
- if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
-#ifdef UDHCP_DEBUG
- strcpy(orig, buffer);
-#endif
- if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
-
- if (!(token = strtok(buffer, " \t"))) continue;
- if (!(line = strtok(NULL, ""))) continue;
-
- /* eat leading whitespace */
- line = line + strspn(line, " \t=");
- /* eat trailing whitespace */
- for (i = strlen(line); i > 0 && isspace(line[i - 1]); i--);
- line[i] = '\0';
-
- for (i = 0; keywords[i].keyword[0]; i++)
- if (!strcasecmp(token, keywords[i].keyword))
- if (!keywords[i].handler(line, keywords[i].var)) {
- LOG(LOG_ERR, "Failure parsing line %d of %s", lm, file);
- DEBUG(LOG_ERR, "unable to parse '%s'", orig);
- /* reset back to the default value */
- keywords[i].handler(keywords[i].def, keywords[i].var);
- }
- }
- fclose(in);
- return 1;
-}
-
-
-void write_leases(void)
-{
- FILE *fp;
- unsigned int i;
- char buf[255];
- time_t curr = time(0);
- unsigned long tmp_time;
-
- if (!(fp = fopen(server_config.lease_file, "w"))) {
- LOG(LOG_ERR, "Unable to open %s for writing", server_config.lease_file);
- return;
- }
-
- for (i = 0; i < server_config.max_leases; i++) {
- if (leases[i].yiaddr != 0) {
-
- /* screw with the time in the struct, for easier writing */
- tmp_time = leases[i].expires;
-
- if (server_config.remaining) {
- if (lease_expired(&(leases[i])))
- leases[i].expires = 0;
- else leases[i].expires -= curr;
- } /* else stick with the time we got */
- leases[i].expires = htonl(leases[i].expires);
- fwrite(&leases[i], sizeof(struct dhcpOfferedAddr), 1, fp);
-
- /* Then restore it when done. */
- leases[i].expires = tmp_time;
- }
- }
- fclose(fp);
-
- if (server_config.notify_file) {
- sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
- system(buf);
- }
-}
-
-
-void read_leases(const char *file)
-{
- FILE *fp;
- unsigned int i = 0;
- struct dhcpOfferedAddr lease;
-
- if (!(fp = fopen(file, "r"))) {
- LOG(LOG_ERR, "Unable to open %s for reading", file);
- return;
- }
-
- while (i < server_config.max_leases && (fread(&lease, sizeof lease, 1, fp) == 1)) {
- /* ADDME: is it a static lease */
- if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
- lease.expires = ntohl(lease.expires);
- if (!server_config.remaining) lease.expires -= time(0);
- if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
- LOG(LOG_WARNING, "Too many leases while loading %s\n", file);
- break;
- }
- i++;
- }
- }
- DEBUG(LOG_INFO, "Read %d leases", i);
- fclose(fp);
-}
projects / grml-terminalserver.git / blobdiff