added full udhcp integration

1 files changed, 228 insertions, 0 deletions

diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
new file mode 100644
index 0000000..4ce23aa
--- /dev/null
+++ b/networking/udhcp/script.c
@@ -0,0 +1,228 @@
+/* script.c
+ *
+ * Functions to call the DHCP client notification scripts 
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+#include "options.h"
+#include "dhcpd.h"
+#include "dhcpc.h"
+#include "packet.h"
+#include "options.h"
+#include "debug.h"
+
+/* get a rough idea of how long an option will be (rounding up...) */
+static int max_option_length[] = {
+	[OPTION_IP] =		sizeof("255.255.255.255 "),
+	[OPTION_IP_PAIR] =	sizeof("255.255.255.255 ") * 2,
+	[OPTION_STRING] =	1,
+	[OPTION_BOOLEAN] =	sizeof("yes "),
+	[OPTION_U8] =		sizeof("255 "),
+	[OPTION_U16] =		sizeof("65535 "),
+	[OPTION_S16] =		sizeof("-32768 "),
+	[OPTION_U32] =		sizeof("4294967295 "),
+	[OPTION_S32] =		sizeof("-2147483684 "),
+};
+
+
+static int upper_length(int length, struct dhcp_option *option)
+{
+	return max_option_length[option->flags & TYPE_MASK] *
+	       (length / option_lengths[option->flags & TYPE_MASK]);
+}
+
+
+static int sprintip(char *dest, char *pre, unsigned char *ip) {
+	return sprintf(dest, "%s%d.%d.%d.%d ", pre, ip[0], ip[1], ip[2], ip[3]);
+}
+
+
+/* Fill dest with the text of option 'option'. */
+static void fill_options(char *dest, unsigned char *option, struct dhcp_option *type_p)
+{
+	int type, optlen;
+	u_int16_t val_u16;
+	int16_t val_s16;
+	u_int32_t val_u32;
+	int32_t val_s32;
+	int len = option[OPT_LEN - 2];
+
+	dest += sprintf(dest, "%s=", type_p->name);
+
+	type = type_p->flags & TYPE_MASK;
+	optlen = option_lengths[type];
+	for(;;) {
+		switch (type) {
+		case OPTION_IP_PAIR:
+			dest += sprintip(dest, "", option);
+			*(dest++) = '/';
+			option += 4;
+			optlen = 4;
+		case OPTION_IP:	/* Works regardless of host byte order. */
+			dest += sprintip(dest, "", option);
+ 			break;
+		case OPTION_BOOLEAN:
+			dest += sprintf(dest, *option ? "yes " : "no ");
+			break;
+		case OPTION_U8:
+			dest += sprintf(dest, "%u ", *option);
+			break;
+		case OPTION_U16:
+			memcpy(&val_u16, option, 2);
+			dest += sprintf(dest, "%u ", ntohs(val_u16));
+			break;
+		case OPTION_S16:
+			memcpy(&val_s16, option, 2);
+			dest += sprintf(dest, "%d ", ntohs(val_s16));
+			break;
+		case OPTION_U32:
+			memcpy(&val_u32, option, 4);
+			dest += sprintf(dest, "%lu ", (unsigned long) ntohl(val_u32));
+			break;
+		case OPTION_S32:
+			memcpy(&val_s32, option, 4);
+			dest += sprintf(dest, "%ld ", (long) ntohl(val_s32));
+			break;
+		case OPTION_STRING:
+			memcpy(dest, option, len);
+			dest[len] = '\0';
+			return;	 /* Short circuit this case */
+		}
+		option += optlen;
+		len -= optlen;
+		if (len <= 0) break;
+	}
+}
+
+
+static char *find_env(const char *prefix, char *defaultstr)
+{
+	extern char **environ;
+	char **ptr;
+	const int len = strlen(prefix);
+
+	for (ptr = environ; *ptr != NULL; ptr++) {
+		if (strncmp(prefix, *ptr, len) == 0)
+			return *ptr;
+	}
+	return defaultstr;
+}
+
+
+/* put all the paramaters into an environment */
+static char **fill_envp(struct dhcpMessage *packet)
+{
+	int num_options = 0;
+	int i, j;
+	char **envp;
+	unsigned char *temp;
+	char over = 0;
+
+	if (packet == NULL)
+		num_options = 0;
+	else {
+		for (i = 0; options[i].code; i++)
+			if (get_option(packet, options[i].code))
+				num_options++;
+		if (packet->siaddr) num_options++;
+		if ((temp = get_option(packet, DHCP_OPTION_OVER)))
+			over = *temp;
+		if (!(over & FILE_FIELD) && packet->file[0]) num_options++;
+		if (!(over & SNAME_FIELD) && packet->sname[0]) num_options++;		
+	}
+	
+	envp = xmalloc((num_options + 5) * sizeof(char *));
+	envp[0] = xmalloc(sizeof("interface=") + strlen(client_config.interface));
+	sprintf(envp[0], "interface=%s", client_config.interface);
+	envp[1] = find_env("PATH", "PATH=/bin:/usr/bin:/sbin:/usr/sbin");
+	envp[2] = find_env("HOME", "HOME=/");
+
+	if (packet == NULL) {
+		envp[3] = NULL;
+		return envp;
+	}
+
+	envp[3] = xmalloc(sizeof("ip=255.255.255.255"));
+	sprintip(envp[3], "ip=", (unsigned char *) &packet->yiaddr);
+	for (i = 0, j = 4; options[i].code; i++) {
+		if ((temp = get_option(packet, options[i].code))) {
+			envp[j] = xmalloc(upper_length(temp[OPT_LEN - 2], &options[i]) + strlen(options[i].name) + 2);
+			fill_options(envp[j], temp, &options[i]);
+			j++;
+		}
+	}
+	if (packet->siaddr) {
+		envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
+		sprintip(envp[j++], "siaddr=", (unsigned char *) &packet->siaddr);
+	}
+	if (!(over & FILE_FIELD) && packet->file[0]) {
+		/* watch out for invalid packets */
+		packet->file[sizeof(packet->file) - 1] = '\0';
+		envp[j] = xmalloc(sizeof("boot_file=") + strlen(packet->file));
+		sprintf(envp[j++], "boot_file=%s", packet->file);
+	}
+	if (!(over & SNAME_FIELD) && packet->sname[0]) {
+		/* watch out for invalid packets */
+		packet->sname[sizeof(packet->sname) - 1] = '\0';
+		envp[j] = xmalloc(sizeof("sname=") + strlen(packet->sname));
+		sprintf(envp[j++], "sname=%s", packet->sname);
+	}	
+	envp[j] = NULL;
+	return envp;
+}
+
+
+/* Call a script with a par file and env vars */
+void run_script(struct dhcpMessage *packet, const char *name)
+{
+	int pid;
+	char **envp;
+
+	if (client_config.script == NULL)
+		return;
+
+	/* call script */
+	pid = fork();
+	if (pid) {
+		waitpid(pid, NULL, 0);
+		return;
+	} else if (pid == 0) {
+		envp = fill_envp(packet);
+		
+		/* close fd's? */
+		
+		/* exec script */
+		DEBUG(LOG_INFO, "execle'ing %s", client_config.script);
+		execle(client_config.script, client_config.script,
+		       name, NULL, envp);
+		LOG(LOG_ERR, "script %s failed: %s",
+		    client_config.script, strerror(errno));
+		exit(1);
+	}			
+}