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-rw-r--r--networking/udhcp/files.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
new file mode 100644
index 0000000..842e0f2
--- /dev/null
+++ b/networking/udhcp/files.c
@@ -0,0 +1,284 @@
+/*
+ * files.c -- DHCP server file manipulation *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ */
+
+#include <stdio.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <ctype.h>
+#include <netdb.h>
+
+#include "debug.h"
+#include "dhcpd.h"
+#include "files.h"
+#include "options.h"
+#include "leases.h"
+
+/* on these functions, make sure you datatype matches */
+static int read_ip(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_str(char *line, void *arg)
+{
+ char **dest = arg;
+
+ if (*dest) free(*dest);
+ *dest = strdup(line);
+
+ return 1;
+}
+
+
+static int read_u32(char *line, void *arg)
+{
+ u_int32_t *dest = arg;
+ char *endptr;
+ *dest = strtoul(line, &endptr, 0);
+ return endptr[0] == '\0';
+}
+
+
+static int read_yn(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(char *line, void *arg)
+{
+ struct option_set **opt_list = arg;
+ char *opt, *val, *endptr;
+ struct dhcp_option *option = NULL;
+ int retval = 0, length = 0;
+ char buffer[255];
+ u_int16_t result_u16;
+ u_int32_t result_u32;
+ int i;
+
+ if (!(opt = strtok(line, " \t="))) return 0;
+
+ for (i = 0; options[i].code; i++)
+ if (!strcmp(options[i].name, opt))
+ option = &(options[i]);
+
+ if (!option) return 0;
+
+ do {
+ val = strtok(NULL, ", \t");
+ if (val) {
+ length = option_lengths[option->flags & TYPE_MASK];
+ retval = 0;
+ 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;
+ memcpy(buffer, val, length);
+ 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));
+ memcpy(buffer, &result_u16, 2);
+ retval = (endptr[0] == '\0');
+ break;
+ case OPTION_S16:
+ result_u16 = htons(strtol(val, &endptr, 0));
+ memcpy(buffer, &result_u16, 2);
+ retval = (endptr[0] == '\0');
+ break;
+ case OPTION_U32:
+ result_u32 = htonl(strtoul(val, &endptr, 0));
+ memcpy(buffer, &result_u32, 4);
+ retval = (endptr[0] == '\0');
+ break;
+ case OPTION_S32:
+ result_u32 = htonl(strtol(val, &endptr, 0));
+ memcpy(buffer, &result_u32, 4);
+ retval = (endptr[0] == '\0');
+ break;
+ default:
+ break;
+ }
+ if (retval)
+ attach_option(opt_list, option, buffer, length);
+ };
+ } while (val && retval && option->flags & OPTION_LIST);
+ return retval;
+}
+
+
+static struct config_keyword keywords[] = {
+ /* keyword[14] handler variable address default[20] */
+ {"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), "/var/lib/misc/udhcpd.leases"},
+ {"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), ""},
+ /*ADDME: static lease */
+ {"", NULL, NULL, ""}
+};
+
+
+int read_config(char *file)
+{
+ FILE *in;
+ char buffer[80], orig[80], *token, *line;
+ int i;
+
+ for (i = 0; strlen(keywords[i].keyword); i++)
+ if (strlen(keywords[i].def))
+ 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, 80, in)) {
+ if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
+ strncpy(orig, buffer, 80);
+ if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
+ token = buffer + strspn(buffer, " \t");
+ if (*token == '\0') continue;
+ line = token + strcspn(token, " \t=");
+ if (*line == '\0') continue;
+ *line = '\0';
+ line++;
+
+ /* 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; strlen(keywords[i].keyword); i++)
+ if (!strcasecmp(token, keywords[i].keyword))
+ if (!keywords[i].handler(line, keywords[i].var)) {
+ LOG(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 lease_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) {
+ if (server_config.remaining) {
+ if (lease_expired(&(leases[i])))
+ lease_time = 0;
+ else lease_time = leases[i].expires - curr;
+ } else lease_time = leases[i].expires;
+ lease_time = htonl(lease_time);
+ fwrite(leases[i].chaddr, 16, 1, fp);
+ fwrite(&(leases[i].yiaddr), 4, 1, fp);
+ fwrite(&lease_time, 4, 1, fp);
+ }
+ }
+ fclose(fp);
+
+ if (server_config.notify_file) {
+ sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
+ system(buf);
+ }
+}
+
+
+void read_leases(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);
+}
+
+
generated by cgit v1.1 at 2024-11-07 21:33:44 +0000