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Date: Sat, 20 Oct 2012 22:15:44 +0200
From: Abdoulaye Walsimou Gaye <awg@...toolkit.org>
To: musl@...ts.openwall.com
Cc: Abdoulaye Walsimou Gaye <awg@...toolkit.org>
Subject: [PATCH 3/4] Import BSD functions defined in <netinet/ether.h> from NetBSD

Signed-off-by: Abdoulaye Walsimou Gaye <awg@...toolkit.org>
---
 include/netinet/ether.h |   14 ++++
 src/network/ethers.c    |  180 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 194 insertions(+)
 create mode 100644 include/netinet/ether.h
 create mode 100644 src/network/ethers.c

diff --git a/include/netinet/ether.h b/include/netinet/ether.h
new file mode 100644
index 0000000..44c614e
--- /dev/null
+++ b/include/netinet/ether.h
@@ -0,0 +1,14 @@
+#ifndef _NETINET_ETHER_H
+#define _NETINET_ETHER_H
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+char	*ether_ntoa(const struct ether_addr *);
+struct 	ether_addr *ether_aton(const char *);
+int	ether_ntohost(char *, const struct ether_addr *);
+int	ether_hostton(const char *, struct ether_addr *);
+int	ether_line(const char *, struct ether_addr *, char *);
+__END_DECLS
+
+#endif /* !_NETINET_ETHER_H */
diff --git a/src/network/ethers.c b/src/network/ethers.c
new file mode 100644
index 0000000..8014581
--- /dev/null
+++ b/src/network/ethers.c
@@ -0,0 +1,180 @@
+/* Origin NetBSD: src/lib/libc/net/ethers.c */
+
+/*
+ * ethers(3N) a la Sun.
+ *
+ * Written by Roland McGrath <roland@...b.com> 10/14/93.
+ * Public domain.
+ *
+ * port for musl by Abdoulaye Walsimou GAYE <awg@...toolkit.org> 2012/10/15
+ */
+
+#define _BSD_SOURCE
+#include <net/ethernet.h>
+#include <netinet/ether.h>
+
+#include <sys/param.h>
+#include <assert.h>
+#include <errno.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef _PATH_ETHERS
+#define _PATH_ETHERS "/etc/ethers"
+#endif
+
+/*
+ * ether_ntoa():
+ * This function converts this structure into an ASCII string of the form
+ * ``xx:xx:xx:xx:xx:xx'', consisting of 6 hexadecimal numbers separated
+ * by colons.  It returns a pointer to a static buffer that is reused for
+ * each call.
+ */
+char *ether_ntoa(const struct ether_addr *e)
+{
+	static char a[18];
+
+	assert(e != NULL);
+
+	(void) snprintf(a, sizeof a, "%02x:%02x:%02x:%02x:%02x:%02x",
+	    e->ether_addr_octet[0], e->ether_addr_octet[1],
+	    e->ether_addr_octet[2], e->ether_addr_octet[3],
+	    e->ether_addr_octet[4], e->ether_addr_octet[5]);
+	return a;
+}
+
+/*
+ * ether_aton():
+ * This function converts an ASCII string of the same form and to a structure
+ * containing the 6 octets of the address.  It returns a pointer to a
+ * static structure that is reused for each call.
+ */
+struct ether_addr *ether_aton(const char *s)
+{
+	static struct ether_addr n;
+	unsigned int i[6];
+
+	assert(s != NULL);
+
+	if (sscanf(s, " %x:%x:%x:%x:%x:%x ", &i[0], &i[1],
+	    &i[2], &i[3], &i[4], &i[5]) == 6) {
+		n.ether_addr_octet[0] = (unsigned char)i[0];
+		n.ether_addr_octet[1] = (unsigned char)i[1];
+		n.ether_addr_octet[2] = (unsigned char)i[2];
+		n.ether_addr_octet[3] = (unsigned char)i[3];
+		n.ether_addr_octet[4] = (unsigned char)i[4];
+		n.ether_addr_octet[5] = (unsigned char)i[5];
+		return &n;
+	}
+	return NULL;
+}
+
+/*
+ * ether_ntohost():
+ * This function interrogates the data base mapping host names to Ethernet
+ * addresses, /etc/ethers.
+ * It looks up the given Ethernet address and writes the associated host name
+ * into the character buffer passed.
+ * It returns zero if it finds the requested host name and -1 if not.
+ */
+int ether_ntohost(char *hostname, const struct ether_addr *e)
+{
+	FILE *f;
+	char *p;
+	size_t len;
+	struct ether_addr try;
+
+	assert(hostname != NULL);
+	assert(e != NULL);
+
+	f = fopen(_PATH_ETHERS, "r");
+	if (f == NULL)
+		return -1;
+	while ((p = fgetln(f, &len)) != NULL) {
+		if (p[len - 1] != '\n')
+			continue;		/* skip lines w/o \n */
+		p[--len] = '\0';
+		if (ether_line(p, &try, hostname) == 0 &&
+		    memcmp(&try, e, sizeof try) == 0) {
+			(void)fclose(f);
+			return 0;
+		}
+	}
+	(void)fclose(f);
+	errno = ENOENT;
+	return -1;
+}
+
+/*
+ * ether_hostton():
+ * This function interrogates the data base mapping host names to Ethernet
+ * addresses, /etc/ethers.
+ * It looks up the given host name and writes the associated Ethernet address
+ * into the structure passed.
+ * It returns zero if it finds the requested address and -1 if not.
+ */
+int ether_hostton(const char *hostname, struct ether_addr *e)
+{
+	FILE *f;
+	char *p;
+	size_t len;
+	char try[MAXHOSTNAMELEN + 1];
+
+	assert(hostname != NULL);
+	assert(e != NULL);
+
+	f = fopen(_PATH_ETHERS, "r");
+	if (f==NULL)
+		return -1;
+
+	while ((p = fgetln(f, &len)) != NULL) {
+		if (p[len - 1] != '\n')
+			continue;		/* skip lines w/o \n */
+		p[--len] = '\0';
+		if (ether_line(p, e, try) == 0 && strcmp(hostname, try) == 0) {
+			(void)fclose(f);
+			return 0;
+		}
+	}
+	(void)fclose(f);
+	errno = ENOENT;
+	return -1;
+}
+
+/*
+ * ether_line():
+ * This function parses a line from the /etc/ethers file and fills in the passed
+ * ``struct ether_addr'' and character buffer with the Ethernet address and host
+ * name on the line.
+ * It returns zero if the line was successfully parsed and -1 if not.
+ */
+int ether_line(const char *l, struct ether_addr *e, char *hostname)
+{
+	unsigned int i[6];
+
+#define S2(arg) #arg
+#define S1(arg) S2(arg)
+	static const char fmt[] = " %x:%x:%x:%x:%x:%x"
+	    " %" S1(MAXHOSTNAMELEN) "s\n";
+#undef S2
+#undef S1
+
+	assert(l != NULL);
+	assert(e != NULL);
+	assert(hostname != NULL);
+
+	if (sscanf(l, fmt,
+	    &i[0], &i[1], &i[2], &i[3], &i[4], &i[5], hostname) == 7) {
+		e->ether_addr_octet[0] = (unsigned char)i[0];
+		e->ether_addr_octet[1] = (unsigned char)i[1];
+		e->ether_addr_octet[2] = (unsigned char)i[2];
+		e->ether_addr_octet[3] = (unsigned char)i[3];
+		e->ether_addr_octet[4] = (unsigned char)i[4];
+		e->ether_addr_octet[5] = (unsigned char)i[5];
+		return 0;
+	}
+	errno = EINVAL;
+	return -1;
+}
-- 
1.7.9.5

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