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authorFrancis Rowe <info@gluglug.org.uk>2014-12-28 20:33:27 (EST)
committer Francis Rowe <info@gluglug.org.uk>2014-12-28 20:33:27 (EST)
commitcfc094637130f9a05673f82f3a45dfbd917c6ed8 (patch)
tree9b4765f08250ff3b888f787e47a6e7fc97a62a67 /resources/utilities/ich9deblob
parentb307eff6f026b1262433eb4d8389b774b3e0a9ff (diff)
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ich9gen: make it possible for user to change the Gbe MAC address
Example: ./ich9gen --macaddress AA:BB:CC:DD:EE:FF
Diffstat (limited to 'resources/utilities/ich9deblob')
-rw-r--r--resources/utilities/ich9deblob/src/ich9gen.c54
1 files changed, 53 insertions, 1 deletions
diff --git a/resources/utilities/ich9deblob/src/ich9gen.c b/resources/utilities/ich9deblob/src/ich9gen.c
index 583957e..81fd182 100644
--- a/resources/utilities/ich9deblob/src/ich9gen.c
+++ b/resources/utilities/ich9deblob/src/ich9gen.c
@@ -22,6 +22,9 @@
int main(int argc, char *argv[])
{
+ int i, j;
+ unsigned char customMacAddress[6]; /* Only set/used if the user wants to */
+
struct GBEREGIONRECORD_8K gbeStruct8k = generatedGbeStruct8k();
struct DESCRIPTORREGIONRECORD descriptorStruct4M = generatedDescriptorStructRom4M();
struct DESCRIPTORREGIONRECORD descriptorStruct8M = generatedDescriptorStructRom8M();
@@ -41,7 +44,56 @@ int main(int argc, char *argv[])
/*
* ------------------------------------------------------------------
- * Down to business
+ * Arguments given on the terminal
+ * ------------------------------------------------------------------
+ */
+
+
+ if(argc==3) {
+
+ /* If user provides their own MAC address, it will be used.
+ * Otherwise, ich9gen will simply use the default one.
+ *
+ * However, if the user provides an invalid MAC address, then ich9gen
+ * will exit. */
+ if(0==strcmp(argv[1],"--macaddress")) {
+ /* 6 hex chars format (example): AA:BB:CC:DD:EE:FF */
+ if (strlen(argv[2]) != 17) {
+ printf("ich9gen: invalid mac address format (wrong length)\n");
+ return 1;
+ }
+ for(i=2; i<14; i+=3) {
+ if(argv[2][i]!=':') {
+ printf("ich9gen: invalid mac address format (non-color characters used as spacing)\n");
+ return 1;
+ }
+ }
+ for(i=0; i<6; i++) {
+ /* Go through each nibble of the byte */
+ for(j=0; j<2; j++) {
+ if(argv[2][(i*3)+j]>='a' && argv[2][(i*3)+j]<='f')
+ customMacAddress[i] |= (argv[2][(i*3)+j] - 87) << ((j^1) << 2);
+ else if(argv[2][(i*3)+j]>='A' && argv[2][(i*3)+j]<='F')
+ customMacAddress[i] |= (argv[2][(i*3)+j] - 55) << ((j^1) << 2);
+ else if(argv[2][(i*3)+j]>='0' && argv[2][(i*3)+j]<='9')
+ customMacAddress[i] |= (argv[2][(i*3)+j] - 48) << ((j^1) << 2);
+ else {
+ printf("ich9gen: invalid mac address format (non-hex characters)\n");
+ return 1;
+ }
+ }
+ }
+ /* Now that the new MAC address is verified, use it */
+ memcpy(&gbeStruct8k.main.macAddress, &customMacAddress, 6); /* Update MAC address in main Gbe */
+ gbeStruct8k.main.checkSum = gbeGetChecksumFrom4kStruct(gbeStruct8k.main, GBECHECKSUMTOTAL); /* Fix the checksum */
+ memcpy(&gbeStruct8k.backup, &gbeStruct8k.main, GBEREGIONSIZE_4K); /* Copy to the backup */
+ }
+
+ }
+
+ /*
+ * ------------------------------------------------------------------
+ * Generate the 12KiB files, ready to be used in a libreboot image
* ------------------------------------------------------------------
*/