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Set env vars from values on the efi loader command line.

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Examine each cmdline arg and if it contains an '=' convert it to ascii and
pass it to putenv(). This allows var=value settings to come in on the
command line.

This will allow overriding dhcp server-provided data in loader(8), as
discussed in PR 202098

PR:		202098
Differential Revision:	https://reviews.freebsd.org/D4561
This commit is contained in:
Ian Lepore 2015-12-22 03:07:38 +00:00
parent 703db8ccae
commit 21fddb1173
1 changed files with 25 additions and 2 deletions
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27
sys/boot/efi/loader/main.c
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@ -64,10 +64,10 @@ EFI_GUID fdtdtb = FDT_TABLE_GUID;
EFI_STATUS
main(int argc, CHAR16 *argv[])
{
char vendor[128];
char var[128];
EFI_LOADED_IMAGE *img;
EFI_GUID *guid;
int i;
int i, j, vargood;
/*
* XXX Chicken-and-egg problem; we want to have console output
@ -77,6 +77,29 @@ main(int argc, CHAR16 *argv[])
*/
cons_probe();
/*
* Loop through the args, and for each one that contains an '=' that is
* not the first character, add it to the environment. This allows
* loader and kernel env vars to be passed on the command line. Convert
* args from UCS-2 to ASCII (16 to 8 bit) as they are copied.
*/
for (i = 1; i < argc; i++) {
vargood = 0;
for (j = 0; argv[i][j] != 0; j++) {
if (j == sizeof(var)) {
vargood = 0;
break;
}
if (j > 0 && argv[i][j] == '=')
vargood = 1;
var[j] = (char)argv[i][j];
}
if (vargood) {
var[j] = 0;
putenv(var);
}
}
if (efi_copy_init()) {
printf("failed to allocate staging area\n");
return (EFI_BUFFER_TOO_SMALL);