Add in ifconfig and route

1 files changed, 476 insertions, 0 deletions

diff --git a/networking/ifconfig.c b/networking/ifconfig.c
new file mode 100644
index 0000000..2134f8a
--- /dev/null
+++ b/networking/ifconfig.c
@@ -0,0 +1,476 @@
+/* ifconfig
+ *
+ * Similar to the standard Unix ifconfig, but with only the necessary
+ * parts for AF_INET, and without any printing of if info (for now).
+ *
+ * Bjorn Wesen, Axis Communications AB
+ *
+ *
+ * Authors of the original ifconfig was:      
+ *              Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ *
+ * 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.
+ *
+ * $Id: ifconfig.c,v 1.1 2001/02/14 08:11:27 andersen Exp $
+ *
+ */
+
+#include "busybox.h"
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>   // strcmp and friends
+#include <ctype.h>    // isdigit and friends
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <linux/if_ether.h>
+
+static int sockfd;  /* socket fd we use to manipulate stuff with */
+
+/* print usage and exit */
+
+#define _(x) x
+
+/* Set a certain interface flag. */
+static int
+set_flag(char *ifname, short flag)
+{
+	struct ifreq ifr;
+	
+	strcpy(ifr.ifr_name, ifname);
+	if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
+		perror("SIOCGIFFLAGS"); 
+		return (-1);
+	}
+	strcpy(ifr.ifr_name, ifname);
+	ifr.ifr_flags |= flag;
+	if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
+		perror("SIOCSIFFLAGS");
+		return -1;
+	}
+	return (0);
+}
+
+
+/* Clear a certain interface flag. */
+static int
+clr_flag(char *ifname, short flag)
+{
+	struct ifreq ifr;
+	
+	strcpy(ifr.ifr_name, ifname);
+	if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
+		perror("SIOCGIFFLAGS");
+		return -1;
+	}
+	strcpy(ifr.ifr_name, ifname);
+	ifr.ifr_flags &= ~flag;
+	if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
+		perror("SIOCSIFFLAGS");
+		return -1;
+	}
+	return (0);
+}
+
+/* resolve XXX.YYY.ZZZ.QQQ -> binary */
+
+static int
+INET_resolve(char *name, struct sockaddr_in *sin)
+{
+	sin->sin_family = AF_INET;
+	sin->sin_port = 0;
+
+	/* Default is special, meaning 0.0.0.0. */
+	if (!strcmp(name, "default")) {
+		sin->sin_addr.s_addr = INADDR_ANY;
+		return (1);
+	}
+	/* Look to see if it's a dotted quad. */
+	if (inet_aton(name, &sin->sin_addr)) {
+		return 0;
+	}
+	/* guess not.. */
+	return -1;
+}
+
+/* Input an Ethernet address and convert to binary. */
+static int
+in_ether(char *bufp, struct sockaddr *sap)
+{
+	unsigned char *ptr;
+	char c, *orig;
+	int i;
+	unsigned val;
+	
+	sap->sa_family = ARPHRD_ETHER;
+	ptr = sap->sa_data;
+	
+	i = 0;
+	orig = bufp;
+	while ((*bufp != '\0') && (i < ETH_ALEN)) {
+		val = 0;
+		c = *bufp++;
+		if (isdigit(c))
+			val = c - '0';
+		else if (c >= 'a' && c <= 'f')
+			val = c - 'a' + 10;
+		else if (c >= 'A' && c <= 'F')
+			val = c - 'A' + 10;
+		else {
+#ifdef DEBUG
+			fprintf(stderr,
+				_("in_ether(%s): invalid ether address!\n"),
+				orig);
+#endif
+			errno = EINVAL;
+			return (-1);
+		}
+		val <<= 4;
+		c = *bufp;
+		if (isdigit(c))
+			val |= c - '0';
+		else if (c >= 'a' && c <= 'f')
+			val |= c - 'a' + 10;
+		else if (c >= 'A' && c <= 'F')
+			val |= c - 'A' + 10;
+		else if (c == ':' || c == 0)
+			val >>= 4;
+		else {
+#ifdef DEBUG
+			fprintf(stderr,
+				_("in_ether(%s): invalid ether address!\n"),
+				orig);
+#endif
+			errno = EINVAL;
+			return (-1);
+		}
+		if (c != 0)
+			bufp++;
+		*ptr++ = (unsigned char) (val & 0377);
+		i++;
+		
+		/* We might get a semicolon here - not required. */
+		if (*bufp == ':')
+			bufp++;
+		
+	}
+
+	if(i != ETH_ALEN) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	return 0;
+}
+
+int ifconfig_main(int argc, char **argv)
+{
+	struct ifreq ifr;
+	struct sockaddr_in sa;
+	struct sockaddr sa2;
+	char **spp;
+	int goterr = 0;
+	int r, didnetmask = 0;
+	char host[128];
+
+	if(argc < 2) {
+		usage(ifconfig_usage);
+	}
+
+	/* Create a channel to the NET kernel. */
+	if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+		perror("socket");
+		exit(1);
+	}
+
+	/* skip argv[0] */
+
+	argc--;
+	argv++;
+
+	spp = argv;
+
+	/* get interface name */
+
+	safe_strncpy(ifr.ifr_name, *spp++, IFNAMSIZ);
+
+	/* Process the remaining arguments. */
+	while (*spp != (char *) NULL) {
+		if (!strcmp(*spp, "arp")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_NOARP);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "-arp")) {
+			goterr |= set_flag(ifr.ifr_name, IFF_NOARP);
+			spp++;
+			continue;
+		}
+		
+		if (!strcmp(*spp, "trailers")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_NOTRAILERS);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "-trailers")) {
+			goterr |= set_flag(ifr.ifr_name, IFF_NOTRAILERS);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "promisc")) {
+			goterr |= set_flag(ifr.ifr_name, IFF_PROMISC);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "-promisc")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_PROMISC);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "multicast")) {
+			goterr |= set_flag(ifr.ifr_name, IFF_MULTICAST);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "-multicast")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_MULTICAST);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "allmulti")) {
+			goterr |= set_flag(ifr.ifr_name, IFF_ALLMULTI);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "-allmulti")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_ALLMULTI);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "up")) {
+			goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "down")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_UP);
+			spp++;
+			continue;
+		}
+
+		if (!strcmp(*spp, "metric")) {
+			if (*++spp == NULL)
+				usage(ifconfig_usage);
+			ifr.ifr_metric = atoi(*spp);
+			if (ioctl(sockfd, SIOCSIFMETRIC, &ifr) < 0) {
+				fprintf(stderr, "SIOCSIFMETRIC: %s\n", strerror(errno));
+				goterr++;
+			}
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "mtu")) {
+			if (*++spp == NULL)
+				usage(ifconfig_usage);
+			ifr.ifr_mtu = atoi(*spp);
+			if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
+				fprintf(stderr, "SIOCSIFMTU: %s\n", strerror(errno));
+				goterr++;
+			}
+			spp++;
+			continue;
+		}
+#ifdef SIOCSKEEPALIVE
+		if (!strcmp(*spp, "keepalive")) {
+			if (*++spp == NULL)
+				usage(ifconfig_usage);
+			ifr.ifr_data = (caddr_t) atoi(*spp);
+			if (ioctl(sockfd, SIOCSKEEPALIVE, &ifr) < 0) {
+				fprintf(stderr, "SIOCSKEEPALIVE: %s\n", strerror(errno));
+				goterr++;
+			}
+			spp++;
+			continue;
+		}
+#endif
+
+#ifdef SIOCSOUTFILL
+		if (!strcmp(*spp, "outfill")) {
+			if (*++spp == NULL)
+				usage(ifconfig_usage);
+			ifr.ifr_data = (caddr_t) atoi(*spp);
+			if (ioctl(sockfd, SIOCSOUTFILL, &ifr) < 0) {
+				fprintf(stderr, "SIOCSOUTFILL: %s\n", strerror(errno));
+				goterr++;
+			}
+			spp++;
+			continue;
+		}
+#endif
+
+		if (!strcmp(*spp, "-broadcast")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_BROADCAST);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "broadcast")) {
+			if (*++spp != NULL) {
+				safe_strncpy(host, *spp, (sizeof host));
+				if (INET_resolve(host, &sa) < 0) {
+					goterr++;
+					spp++;
+					continue;
+				}
+				memcpy((char *) &ifr.ifr_broadaddr,
+				       (char *) &sa,
+				       sizeof(struct sockaddr));
+				if (ioctl(sockfd, SIOCSIFBRDADDR, &ifr) < 0) {
+					perror("SIOCSIFBRDADDR");
+					goterr++;
+				}
+				spp++;
+			}
+			goterr |= set_flag(ifr.ifr_name, IFF_BROADCAST);
+			continue;
+		}
+		if (!strcmp(*spp, "dstaddr")) {
+			if (*++spp == NULL)
+				usage(ifconfig_usage);
+			safe_strncpy(host, *spp, (sizeof host));
+			if (INET_resolve(host, &sa) < 0) {
+				goterr++;
+				spp++;
+				continue;
+			}
+			memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
+			       sizeof(struct sockaddr));
+			if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
+				fprintf(stderr, "SIOCSIFDSTADDR: %s\n",
+					strerror(errno));
+				goterr++;
+			}
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "netmask")) {
+			if (*++spp == NULL || didnetmask)
+				usage(ifconfig_usage);
+			safe_strncpy(host, *spp, (sizeof host));
+			if (INET_resolve(host, &sa) < 0) {
+				goterr++;
+				spp++;
+				continue;
+			}
+			didnetmask++;
+			memcpy((char *) &ifr.ifr_netmask, (char *) &sa,
+			       sizeof(struct sockaddr));
+			if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
+				perror("SIOCSIFNETMASK");
+				goterr++;
+			}
+			spp++;
+			continue;
+		}
+
+		if (!strcmp(*spp, "-pointopoint")) {
+			goterr |= clr_flag(ifr.ifr_name, IFF_POINTOPOINT);
+			spp++;
+			continue;
+		}
+		if (!strcmp(*spp, "pointopoint")) {
+			if (*(spp + 1) != NULL) {
+				spp++;
+				safe_strncpy(host, *spp, (sizeof host));
+				if (INET_resolve(host, &sa)) {
+					goterr++;
+					spp++;
+					continue;
+				}
+				memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
+				       sizeof(struct sockaddr));
+				if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
+					perror("SIOCSIFDSTADDR");
+					goterr++;
+				}
+			}
+			goterr |= set_flag(ifr.ifr_name, IFF_POINTOPOINT);
+			spp++;
+			continue;
+		};
+
+		if (!strcmp(*spp, "hw")) {
+			if (*++spp == NULL || strcmp("ether", *spp)) {
+				usage(ifconfig_usage);
+			}
+				
+			if (*++spp == NULL) {
+				/* silently ignore it if no address */
+				continue;
+			}
+
+			safe_strncpy(host, *spp, (sizeof host));
+			if (in_ether(host, &sa2) < 0) {
+				fprintf(stderr, "invalid hw-addr %s\n", host);
+				goterr++;
+				spp++;
+				continue;
+			}
+			memcpy((char *) &ifr.ifr_hwaddr, (char *) &sa2,
+			       sizeof(struct sockaddr));
+			if (ioctl(sockfd, SIOCSIFHWADDR, &ifr) < 0) {
+				perror("SIOCSIFHWADDR");
+				goterr++;
+			}
+			spp++;
+			continue;
+		}
+
+		/* If the next argument is a valid hostname, assume OK. */
+		safe_strncpy(host, *spp, (sizeof host));
+
+		if (INET_resolve(host, &sa) < 0) {
+			usage(ifconfig_usage);
+		}
+		memcpy((char *) &ifr.ifr_addr,
+		       (char *) &sa, sizeof(struct sockaddr));
+
+		r = ioctl(sockfd, SIOCSIFADDR, &ifr);
+
+		if (r < 0) {
+			perror("SIOCSIFADDR");
+			goterr++;
+		}
+
+		/*
+		 * Don't do the set_flag() if the address is an alias with a - at the
+		 * end, since it's deleted already! - Roman
+		 *
+		 * Should really use regex.h here, not sure though how well it'll go
+		 * with the cross-platform support etc. 
+		 */
+		{
+			char *ptr;
+			short int found_colon = 0;
+			for (ptr = ifr.ifr_name; *ptr; ptr++ )
+				if (*ptr == ':') found_colon++;
+			
+			if (!(found_colon && *(ptr - 1) == '-'))
+				goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
+		}
+		
+		spp++;
+
+	} /* end of while-loop */
+
+        exit(0);
+}
+