285 lines
7.1 KiB
C
285 lines
7.1 KiB
C
/*
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* files.c -- DHCP server file manipulation *
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* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
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*/
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#include <stdio.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <ctype.h>
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#include <netdb.h>
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#include "debug.h"
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#include "dhcpd.h"
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#include "files.h"
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#include "options.h"
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#include "leases.h"
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/* on these functions, make sure you datatype matches */
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static int read_ip(char *line, void *arg)
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{
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struct in_addr *addr = arg;
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struct hostent *host;
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int retval = 1;
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if (!inet_aton(line, addr)) {
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if ((host = gethostbyname(line)))
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addr->s_addr = *((unsigned long *) host->h_addr_list[0]);
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else retval = 0;
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}
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return retval;
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}
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static int read_str(char *line, void *arg)
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{
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char **dest = arg;
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if (*dest) free(*dest);
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*dest = strdup(line);
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return 1;
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}
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static int read_u32(char *line, void *arg)
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{
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u_int32_t *dest = arg;
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char *endptr;
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*dest = strtoul(line, &endptr, 0);
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return endptr[0] == '\0';
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}
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static int read_yn(char *line, void *arg)
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{
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char *dest = arg;
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int retval = 1;
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if (!strcasecmp("yes", line))
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*dest = 1;
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else if (!strcasecmp("no", line))
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*dest = 0;
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else retval = 0;
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return retval;
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}
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/* read a dhcp option and add it to opt_list */
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static int read_opt(char *line, void *arg)
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{
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struct option_set **opt_list = arg;
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char *opt, *val, *endptr;
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struct dhcp_option *option = NULL;
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int retval = 0, length = 0;
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char buffer[255];
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u_int16_t result_u16;
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u_int32_t result_u32;
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int i;
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if (!(opt = strtok(line, " \t="))) return 0;
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for (i = 0; options[i].code; i++)
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if (!strcmp(options[i].name, opt))
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option = &(options[i]);
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if (!option) return 0;
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do {
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val = strtok(NULL, ", \t");
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if (val) {
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length = option_lengths[option->flags & TYPE_MASK];
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retval = 0;
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switch (option->flags & TYPE_MASK) {
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case OPTION_IP:
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retval = read_ip(val, buffer);
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break;
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case OPTION_IP_PAIR:
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retval = read_ip(val, buffer);
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if (!(val = strtok(NULL, ", \t/-"))) retval = 0;
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if (retval) retval = read_ip(val, buffer + 4);
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break;
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case OPTION_STRING:
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length = strlen(val);
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if (length > 0) {
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if (length > 254) length = 254;
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memcpy(buffer, val, length);
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retval = 1;
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}
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break;
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case OPTION_BOOLEAN:
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retval = read_yn(val, buffer);
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break;
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case OPTION_U8:
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buffer[0] = strtoul(val, &endptr, 0);
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retval = (endptr[0] == '\0');
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break;
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case OPTION_U16:
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result_u16 = htons(strtoul(val, &endptr, 0));
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memcpy(buffer, &result_u16, 2);
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retval = (endptr[0] == '\0');
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break;
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case OPTION_S16:
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result_u16 = htons(strtol(val, &endptr, 0));
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memcpy(buffer, &result_u16, 2);
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retval = (endptr[0] == '\0');
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break;
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case OPTION_U32:
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result_u32 = htonl(strtoul(val, &endptr, 0));
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memcpy(buffer, &result_u32, 4);
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retval = (endptr[0] == '\0');
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break;
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case OPTION_S32:
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result_u32 = htonl(strtol(val, &endptr, 0));
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memcpy(buffer, &result_u32, 4);
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retval = (endptr[0] == '\0');
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break;
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default:
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break;
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}
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if (retval)
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attach_option(opt_list, option, buffer, length);
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};
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} while (val && retval && option->flags & OPTION_LIST);
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return retval;
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}
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static struct config_keyword keywords[] = {
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/* keyword[14] handler variable address default[20] */
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{"start", read_ip, &(server_config.start), "192.168.0.20"},
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{"end", read_ip, &(server_config.end), "192.168.0.254"},
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{"interface", read_str, &(server_config.interface), "eth0"},
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{"option", read_opt, &(server_config.options), ""},
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{"opt", read_opt, &(server_config.options), ""},
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{"max_leases", read_u32, &(server_config.max_leases), "254"},
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{"remaining", read_yn, &(server_config.remaining), "yes"},
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{"auto_time", read_u32, &(server_config.auto_time), "7200"},
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{"decline_time",read_u32, &(server_config.decline_time),"3600"},
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{"conflict_time",read_u32,&(server_config.conflict_time),"3600"},
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{"offer_time", read_u32, &(server_config.offer_time), "60"},
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{"min_lease", read_u32, &(server_config.min_lease), "60"},
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{"lease_file", read_str, &(server_config.lease_file), "/var/lib/misc/udhcpd.leases"},
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{"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
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{"notify_file", read_str, &(server_config.notify_file), ""},
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{"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"},
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{"sname", read_str, &(server_config.sname), ""},
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{"boot_file", read_str, &(server_config.boot_file), ""},
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/*ADDME: static lease */
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{"", NULL, NULL, ""}
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};
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int read_config(char *file)
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{
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FILE *in;
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char buffer[80], orig[80], *token, *line;
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int i;
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for (i = 0; strlen(keywords[i].keyword); i++)
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if (strlen(keywords[i].def))
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keywords[i].handler(keywords[i].def, keywords[i].var);
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if (!(in = fopen(file, "r"))) {
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LOG(LOG_ERR, "unable to open config file: %s", file);
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return 0;
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}
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while (fgets(buffer, 80, in)) {
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if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
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strncpy(orig, buffer, 80);
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if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
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token = buffer + strspn(buffer, " \t");
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if (*token == '\0') continue;
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line = token + strcspn(token, " \t=");
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if (*line == '\0') continue;
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*line = '\0';
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line++;
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/* eat leading whitespace */
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line = line + strspn(line, " \t=");
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/* eat trailing whitespace */
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for (i = strlen(line); i > 0 && isspace(line[i - 1]); i--);
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line[i] = '\0';
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for (i = 0; strlen(keywords[i].keyword); i++)
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if (!strcasecmp(token, keywords[i].keyword))
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if (!keywords[i].handler(line, keywords[i].var)) {
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LOG(LOG_ERR, "unable to parse '%s'", orig);
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/* reset back to the default value */
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keywords[i].handler(keywords[i].def, keywords[i].var);
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}
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}
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fclose(in);
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return 1;
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}
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void write_leases(void)
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{
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FILE *fp;
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unsigned int i;
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char buf[255];
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time_t curr = time(0);
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unsigned long lease_time;
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if (!(fp = fopen(server_config.lease_file, "w"))) {
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LOG(LOG_ERR, "Unable to open %s for writing", server_config.lease_file);
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return;
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}
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for (i = 0; i < server_config.max_leases; i++) {
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if (leases[i].yiaddr != 0) {
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if (server_config.remaining) {
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if (lease_expired(&(leases[i])))
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lease_time = 0;
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else lease_time = leases[i].expires - curr;
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} else lease_time = leases[i].expires;
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lease_time = htonl(lease_time);
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fwrite(leases[i].chaddr, 16, 1, fp);
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fwrite(&(leases[i].yiaddr), 4, 1, fp);
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fwrite(&lease_time, 4, 1, fp);
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}
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}
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fclose(fp);
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if (server_config.notify_file) {
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sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
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system(buf);
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}
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}
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void read_leases(char *file)
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{
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FILE *fp;
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unsigned int i = 0;
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struct dhcpOfferedAddr lease;
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if (!(fp = fopen(file, "r"))) {
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LOG(LOG_ERR, "Unable to open %s for reading", file);
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return;
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}
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while (i < server_config.max_leases && (fread(&lease, sizeof lease, 1, fp) == 1)) {
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/* ADDME: is it a static lease */
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if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
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lease.expires = ntohl(lease.expires);
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if (!server_config.remaining) lease.expires -= time(0);
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if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
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LOG(LOG_WARNING, "Too many leases while loading %s\n", file);
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break;
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}
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i++;
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}
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}
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DEBUG(LOG_INFO, "Read %d leases", i);
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fclose(fp);
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}
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