canoeboot
/
cbmk
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

util/nvmutil: more granular MAC parsing errors 

tell the user exactly what they got wrong, instead
of simply printing "bad mac address", which is not
very helpful to the user

Signed-off-by: Leah Rowe <leah@libreboot.org>
master
Leah Rowe 2025-01-24 16:58:51 +00:00
parent dc376cca14
commit 11eb4df755
1 changed files with 16 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
util/nvmutil/nvmutil.c
View File

@ -15,10 +15,10 @@
#include <unistd.h>
void cmd_setchecksum(void), cmd_brick(void), swap(int partnum), writeGbe(void),
cmd_dump(void), cmd_setmac(void), readGbe(void), cmd_copy(void),
cmd_dump(void), cmd_setmac(void), readGbe(void), checkdir(const char *path),
macf(int partnum), hexdump(int partnum), openFiles(const char *path),
checkdir(const char *path);
int macAddress(const char *strMac, uint16_t *mac), goodChecksum(int partnum);
cmd_copy(void), parseMacString(const char *strMac, uint16_t *mac);
int goodChecksum(int partnum);
uint8_t hextonum(char chs), rhex(void);
#define COMMAND argv[2]
@ -205,8 +205,7 @@ readGbe(void)
void
cmd_setmac(void)
{
if (macAddress(strMac, mac))
err(errno = ECANCELED, "Bad MAC address");
parseMacString(strMac, mac);
for (int partnum = 0; partnum < 2; partnum++) {
if (!goodChecksum(part = partnum))
@ -220,24 +219,27 @@ cmd_setmac(void)
}
/* parse MAC string, write to char buffer */
int
macAddress(const char *strMac, uint16_t *mac)
void
parseMacString(const char *strMac, uint16_t *mac)
{
uint64_t total = 0;
if (strnlen(strMac, 20) != 17)
return 1; /* 1 means error */
err(errno = EINVAL, "Invalid MAC address string length");
for (uint8_t h, i = 0; i < 16; i += 3) {
if (i != 15)
if (strMac[i + 2] != ':')
return 1;
err(errno = EINVAL,
"Invalid MAC address separator '%c'",
strMac[i + 2]);
int byte = i / 3;
/* Update MAC buffer per-nibble from a given string */
for (int nib = 0; nib < 2; nib++, total += h) {
if ((h = hextonum(strMac[i + nib])) > 15)
return 1; /* invalid character, MAC string */
err(errno = EINVAL, "Invalid character '%c'",
strMac[i + nib]);
/* if random: ensure local-only, unicast MAC */
if ((byte == 0) && (nib == 1)) /* unicast/local nib */
@ -249,8 +251,10 @@ macAddress(const char *strMac, uint16_t *mac)
}
}
/* do not permit multicast/all-zero MAC: */
return ((total == 0) || (mac[0] & 1)) ? 1 : 0;
if (total == 0)
err(errno = EINVAL, "Invalid MAC (all-zero MAC address)");
if (mac[0] & 1)
err(errno = EINVAL, "Invalid MAC (multicast bit set)");
}
/* convert hex char to char value (0-15) */