dhcpcd: Update to Version 5.2.10

Change-Id: I949331c7aad91b125decd51da4041983d3a352bc
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

9 files changed, 583 insertions, 0 deletions

diff --git a/compat/arc4random.c b/compat/arc4random.c
new file mode 100644
index 0000000..48ef29d
--- /dev/null
+++ b/compat/arc4random.c
@@ -0,0 +1,158 @@
+/*
+ * Arc4 random number generator for OpenBSD.
+ * Copyright 1996 David Mazieres <dm@lcs.mit.edu>.
+ *
+ * Modification and redistribution in source and binary forms is
+ * permitted provided that due credit is given to the author and the
+ * OpenBSD project by leaving this copyright notice intact.
+ */
+
+/*
+ * This code is derived from section 17.1 of Applied Cryptography,
+ * second edition, which describes a stream cipher allegedly
+ * compatible with RSA Labs "RC4" cipher (the actual description of
+ * which is a trade secret).  The same algorithm is used as a stream
+ * cipher called "arcfour" in Tatu Ylonen's ssh package.
+ *
+ * Here the stream cipher has been modified always to include the time
+ * when initializing the state.  That makes it impossible to
+ * regenerate the same random sequence twice, so this can't be used
+ * for encryption, but will generate good random numbers.
+ *
+ * RC4 is a registered trademark of RSA Laboratories.
+ */
+
+#include <sys/time.h>
+
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "arc4random.h"
+
+struct arc4_stream {
+	uint8_t i;
+	uint8_t j;
+	uint8_t s[256];
+};
+
+static int rs_initialized;
+static struct arc4_stream rs;
+static int arc4_count;
+
+static void
+arc4_init(struct arc4_stream *as)
+{
+	int n;
+
+	for (n = 0; n < 256; n++)
+		as->s[n] = n;
+	as->i = 0;
+	as->j = 0;
+}
+
+static void
+arc4_addrandom(struct arc4_stream *as, unsigned char *dat, int datlen)
+{
+	int n;
+	uint8_t si;
+
+	as->i--;
+	for (n = 0; n < 256; n++) {
+		as->i = (as->i + 1);
+		si = as->s[as->i];
+		as->j = (as->j + si + dat[n % datlen]);
+		as->s[as->i] = as->s[as->j];
+		as->s[as->j] = si;
+	}
+	as->j = as->i;
+}
+
+static uint8_t
+arc4_getbyte(struct arc4_stream *as)
+{
+	uint8_t si, sj;
+
+	as->i = (as->i + 1);
+	si = as->s[as->i];
+	as->j = (as->j + si);
+	sj = as->s[as->j];
+	as->s[as->i] = sj;
+	as->s[as->j] = si;
+	return (as->s[(si + sj) & 0xff]);
+}
+
+static uint32_t
+arc4_getword(struct arc4_stream *as)
+{
+	uint32_t val;
+
+	val = arc4_getbyte(as) << 24;
+	val |= arc4_getbyte(as) << 16;
+	val |= arc4_getbyte(as) << 8;
+	val |= arc4_getbyte(as);
+	return val;
+}
+
+static void
+arc4_stir(struct arc4_stream *as)
+{
+	int fd;
+	struct {
+		struct timeval tv;
+		unsigned int rnd[(128 - sizeof(struct timeval)) /
+			sizeof(unsigned int)];
+	}       rdat;
+	int n;
+
+	gettimeofday(&rdat.tv, NULL);
+	fd = open("/dev/urandom", O_RDONLY);
+	if (fd != -1) {
+		n = read(fd, rdat.rnd, sizeof(rdat.rnd));
+		close(fd);
+	}
+
+	/* fd < 0?  Ah, what the heck. We'll just take
+	 * whatever was on the stack... */
+	arc4_addrandom(as, (void *) &rdat, sizeof(rdat));
+
+	/*
+	 * Throw away the first N words of output, as suggested in the
+	 * paper "Weaknesses in the Key Scheduling Algorithm of RC4"
+	 * by Fluher, Mantin, and Shamir.  (N = 256 in our case.)
+	 */
+	for (n = 0; n < 256 * 4; n++)
+		arc4_getbyte(as);
+	arc4_count = 1600000;
+}
+
+void
+arc4random_stir()
+{
+
+	if (!rs_initialized) {
+		arc4_init(&rs);
+		rs_initialized = 1;
+	}
+	arc4_stir(&rs);
+}
+
+void
+arc4random_addrandom(unsigned char *dat, int datlen)
+{
+
+	if (!rs_initialized)
+		arc4random_stir();
+	arc4_addrandom(&rs, dat, datlen);
+}
+
+uint32_t
+arc4random()
+{
+
+	arc4_count -= 4;
+	if (!rs_initialized || arc4_count <= 0)
+		arc4random_stir();
+	return arc4_getword(&rs);
+}
diff --git a/compat/arc4random.h b/compat/arc4random.h
new file mode 100644
index 0000000..2b10902
--- /dev/null
+++ b/compat/arc4random.h
@@ -0,0 +1,36 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2010 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef ARC4RANDOM_H
+#define ARC4RANDOM_H
+
+#include <stdint.h>
+
+void arc4random_stir(void);
+void arc4random_addrandom(unsigned char *, int);
+uint32_t arc4random(void);
+#endif
diff --git a/compat/closefrom.c b/compat/closefrom.c
new file mode 100644
index 0000000..664c4bc
--- /dev/null
+++ b/compat/closefrom.c
@@ -0,0 +1,42 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+
+#include "closefrom.h"
+
+int
+closefrom(int fd)
+{
+	int max = getdtablesize();
+	int i;
+	int r = 0;
+
+	for (i = fd; i < max; i++)
+		r += close(i);
+	return r;
+}
diff --git a/compat/closefrom.h b/compat/closefrom.h
new file mode 100644
index 0000000..b028507
--- /dev/null
+++ b/compat/closefrom.h
@@ -0,0 +1,31 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef CLOSEFROM_H
+#define CLOSEFROM_H
+int closefrom(int);
+#endif
diff --git a/compat/getline.c b/compat/getline.c
new file mode 100644
index 0000000..3f01b66
--- /dev/null
+++ b/compat/getline.c
@@ -0,0 +1,75 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "getline.h"
+
+/* Redefine a small buffer for our simple text config files */
+#undef BUFSIZ
+#define BUFSIZ 128
+
+ssize_t
+getline(char ** __restrict buf, size_t * __restrict buflen,
+    FILE * __restrict fp)
+{
+	size_t bytes, newlen;
+	char *newbuf, *p;
+	
+	if (buf == NULL || buflen == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	if (*buf == NULL)
+		*buflen = 0;
+	
+	bytes = 0;
+	do {
+		if (feof(fp))
+			break;
+		if (*buf == NULL || bytes != 0) {
+			newlen = *buflen + BUFSIZ;
+			newbuf = realloc(*buf, newlen);
+			if (newbuf == NULL)
+				return -1;
+			*buf = newbuf;
+			*buflen = newlen;
+		}
+		p = *buf + bytes;
+		memset(p, 0, BUFSIZ);
+		if (fgets(p, BUFSIZ, fp) == NULL)
+			break;
+		bytes += strlen(p);
+	} while (bytes == 0 || *(*buf + (bytes - 1)) != '\n');
+	if (bytes == 0)
+		return -1;
+	return bytes;
+}
diff --git a/compat/getline.h b/compat/getline.h
new file mode 100644
index 0000000..390632c
--- /dev/null
+++ b/compat/getline.h
@@ -0,0 +1,36 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef GETLINE_H
+#define GETLINE_H
+
+#include <sys/types.h>
+#include <stdio.h>
+
+ssize_t getline(char ** __restrict buf, size_t * __restrict buflen,
+    FILE * __restrict fp);
+#endif
diff --git a/compat/linkaddr.c b/compat/linkaddr.c
new file mode 100644
index 0000000..c4e6fa5
--- /dev/null
+++ b/compat/linkaddr.c
@@ -0,0 +1,120 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)linkaddr.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/if_dl.h>
+
+#include <string.h>
+
+/* States*/
+#define NAMING	0
+#define GOTONE	1
+#define GOTTWO	2
+#define RESET	3
+/* Inputs */
+#define	DIGIT	(4*0)
+#define	END	(4*1)
+#define DELIM	(4*2)
+#define LETTER	(4*3)
+
+void
+link_addr(addr, sdl)
+	const char *addr;
+	struct sockaddr_dl *sdl;
+{
+	char *cp = sdl->sdl_data;
+	char *cplim = sdl->sdl_len + (char *)(void *)sdl;
+	int byte = 0, state = NAMING;
+	int newaddr = 0;
+
+	(void)memset(&sdl->sdl_family, 0, (size_t)sdl->sdl_len - 1);
+	sdl->sdl_family = AF_LINK;
+	do {
+		state &= ~LETTER;
+		if ((*addr >= '0') && (*addr <= '9')) {
+			newaddr = *addr - '0';
+		} else if ((*addr >= 'a') && (*addr <= 'f')) {
+			newaddr = *addr - 'a' + 10;
+		} else if ((*addr >= 'A') && (*addr <= 'F')) {
+			newaddr = *addr - 'A' + 10;
+		} else if (*addr == 0) {
+			state |= END;
+		} else if (state == NAMING &&
+			   (((*addr >= 'A') && (*addr <= 'Z')) ||
+			   ((*addr >= 'a') && (*addr <= 'z'))))
+			state |= LETTER;
+		else
+			state |= DELIM;
+		addr++;
+		switch (state /* | INPUT */) {
+		case NAMING | DIGIT:
+		case NAMING | LETTER:
+			*cp++ = addr[-1];
+			continue;
+		case NAMING | DELIM:
+			state = RESET;
+			sdl->sdl_nlen = cp - sdl->sdl_data;
+			continue;
+		case GOTTWO | DIGIT:
+			*cp++ = byte;
+			/* FALLTHROUGH */
+		case RESET | DIGIT:
+			state = GOTONE;
+			byte = newaddr;
+			continue;
+		case GOTONE | DIGIT:
+			state = GOTTWO;
+			byte = newaddr + (byte << 4);
+			continue;
+		default: /* | DELIM */
+			state = RESET;
+			*cp++ = byte;
+			byte = 0;
+			continue;
+		case GOTONE | END:
+		case GOTTWO | END:
+			*cp++ = byte;
+			/* FALLTHROUGH */
+		case RESET | END:
+			break;
+		}
+		break;
+	} while (cp < cplim);
+	sdl->sdl_alen = cp - LLADDR(sdl);
+	newaddr = cp - (char *)(void *)sdl;
+	if ((size_t) newaddr > sizeof(*sdl))
+		sdl->sdl_len = newaddr;
+	return;
+}
diff --git a/compat/strlcpy.c b/compat/strlcpy.c
new file mode 100644
index 0000000..e44d19c
--- /dev/null
+++ b/compat/strlcpy.c
@@ -0,0 +1,51 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+
+#include "strlcpy.h"
+
+size_t
+strlcpy(char *dst, const char *src, size_t size)
+{
+	const char *s = src;
+	size_t n = size;
+
+	if (n && --n)
+		do {
+			if (!(*dst++ = *src++))
+				break;
+		} while (--n);
+
+	if (!n) {
+		if (size)
+			*dst = '\0';
+		while (*src++);
+	}
+
+	return src - s - 1;
+}
diff --git a/compat/strlcpy.h b/compat/strlcpy.h
new file mode 100644
index 0000000..0ff3854
--- /dev/null
+++ b/compat/strlcpy.h
@@ -0,0 +1,34 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef STRLCPY_H
+#define STRLCPY_H
+
+#include <sys/types.h>
+
+size_t strlcpy(char *, const char *, size_t);
+#endif