add back in udhcp support

1 files changed, 393 insertions, 0 deletions

diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
new file mode 100644
index 0000000..fe853c7
--- /dev/null
+++ b/networking/udhcp/files.c
@@ -0,0 +1,393 @@
+/*
+ * 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 "options.h"
+#include "files.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;
+
+	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;
+}
+
+
+/* find option 'code' in opt_list */
+struct option_set *find_option(struct option_set *opt_list, char code)
+{
+	while (opt_list && opt_list->data[OPT_CODE] < code)
+		opt_list = opt_list->next;
+
+	if (opt_list && opt_list->data[OPT_CODE] == code) return opt_list;
+	else return NULL;
+}
+
+
+/* add an option to the opt_list */
+static void attach_option(struct option_set **opt_list, struct dhcp_option *option, char *buffer, int length)
+{
+	struct option_set *existing, *new, **curr;
+
+	/* add it to an existing option */
+	if ((existing = find_option(*opt_list, option->code))) {
+		DEBUG(LOG_INFO, "Attaching option %s to existing member of list", option->name);
+		if (option->flags & OPTION_LIST) {
+			if (existing->data[OPT_LEN] + length <= 255) {
+				existing->data = realloc(existing->data,
+						existing->data[OPT_LEN] + length + 2);
+				memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
+				existing->data[OPT_LEN] += length;
+			} /* else, ignore the data, we could put this in a second option in the future */
+		} /* else, ignore the new data */
+	} else {
+		DEBUG(LOG_INFO, "Attaching option %s to list", option->name);
+
+		/* make a new option */
+		new = xmalloc(sizeof(struct option_set));
+		new->data = xmalloc(length + 2);
+		new->data[OPT_CODE] = option->code;
+		new->data[OPT_LEN] = length;
+		memcpy(new->data + 2, buffer, length);
+
+		curr = opt_list;
+		while (*curr && (*curr)->data[OPT_CODE] < option->code)
+			curr = &(*curr)->next;
+
+		new->next = *curr;
+		*curr = new;
+	}
+}
+
+
+/* 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);
+}