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authorEric Andersen2003-07-05 07:59:30 +0000
committerEric Andersen2003-07-05 07:59:30 +0000
commit7207b88d062ca3fe58370ef9976388c0023ff746 (patch)
treee9164acc8a39daebf9bd66d589faa3f1d1a2c071 /networking
parent65e20a33c20314da5dd33d6e9e2ec529d835bbfb (diff)
downloadbusybox-7207b88d062ca3fe58370ef9976388c0023ff746.zip
busybox-7207b88d062ca3fe58370ef9976388c0023ff746.tar.gz
Patch from Lars Kellogg-Stedman:
This patch fixes endian problems with get_netmask(). I don't know if this is the cleanest solution, but it makes 'ipcalc -n' work on both an i386 system and a ppc system.
Diffstat (limited to 'networking')
-rw-r--r--networking/ipcalc.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/networking/ipcalc.c b/networking/ipcalc.c
index af4eed4..94b747e 100644
--- a/networking/ipcalc.c
+++ b/networking/ipcalc.c
@@ -22,15 +22,22 @@
#define IPCALC_MSG(CMD,ALTCMD) if (mode & SILENT) {ALTCMD;} else {CMD;}
+#define CLASS_A_NETMASK ntohl(0xFF000000)
+#define CLASS_B_NETMASK ntohl(0xFFFF0000)
+#define CLASS_C_NETMASK ntohl(0xFFFFFF00)
+
static unsigned long get_netmask(unsigned long ipaddr)
{
- if (ipaddr & 0xC0) {
- return 0x00FFFFFF; /* Class C */
- }
- if (ipaddr & 0x10) {
- return 0x0000FFFF; /* Class B */
- }
- return 0x000000FF; /* Class A */
+ ipaddr = htonl(ipaddr);
+
+ if ((ipaddr & 0xC0000000) == 0xC0000000)
+ return CLASS_C_NETMASK;
+ else if ((ipaddr & 0x80000000) == 0x80000000)
+ return CLASS_B_NETMASK;
+ else if ((ipaddr & 0x80000000) == 0)
+ return CLASS_A_NETMASK;
+ else
+ return 0;
}
#define NETMASK 0x01