added full udhcp integration

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);
+}
+		
+