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tftp: Normalize slashes in TFTP paths 

Some TFTP servers do not handle multiple consecutive slashes correctly.
This patch avoids sending TFTP requests with non-normalized paths.

Signed-off-by: Lenny Szubowicz <lszubowi@redhat.com>
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Lenny Szubowicz 2019-10-31 11:33:39 +01:00 committed by Daniel Kiper
parent 5e5a15872d
commit e2c09aed97
1 changed files with 28 additions and 3 deletions
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31
grub-core/net/tftp.c
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@ -300,6 +300,26 @@ destroy_pq (tftp_data_t data)
grub_priority_queue_destroy (data->pq);
}
/*
* Create a normalized copy of the filename. Compress any string of consecutive
* forward slashes to a single forward slash.
*/
static void
grub_normalize_filename (char *normalized, const char *filename)
{
char *dest = normalized;
const char *src = filename;
while (*src != '\0')
{
if (src[0] == '/' && src[1] == '/')
src++;
else
*dest++ = *src++;
}
*dest = '\0';
}
static grub_err_t
tftp_open (struct grub_file *file, const char *filename)
{
@ -337,9 +357,14 @@ tftp_open (struct grub_file *file, const char *filename)
rrqlen = 0;
tftph->opcode = grub_cpu_to_be16_compile_time (TFTP_RRQ);
grub_strcpy (rrq, filename);
rrqlen += grub_strlen (filename) + 1;
rrq += grub_strlen (filename) + 1;
/*
* Copy and normalize the filename to work-around issues on some TFTP
* servers when file names are being matched for remapping.
*/
grub_normalize_filename (rrq, filename);
rrqlen += grub_strlen (rrq) + 1;
rrq += grub_strlen (rrq) + 1;
grub_strcpy (rrq, "octet");
rrqlen += grub_strlen ("octet") + 1;