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net: Do not overwrite options found in overloaded 'file' field

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If 'file' is overloaded, it is wrong to get or put the bootfile name
from it/to it.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Stefan Brüns 2015-09-04 00:31:48 +02:00 committed by Joe Hershberger
parent 219cc94a3f
commit ec87b1b39b
1 changed files with 18 additions and 26 deletions
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44
net/bootp.c
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@ -64,6 +64,9 @@ char net_root_path[64] = {0,}; /* Our bootpath */
static dhcp_state_t dhcp_state = INIT;
static u32 dhcp_leasetime;
static struct in_addr dhcp_server_ip;
static u8 dhcp_option_overload;
#define OVERLOAD_FILE 1
#define OVERLOAD_SNAME 2
static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
unsigned src, unsigned len);
@ -146,9 +149,14 @@ static void store_net_params(struct bootp_hdr *bp)
net_copy_ip(&net_server_ip, &bp->bp_siaddr);
memcpy(net_server_ethaddr,
((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
if (strlen(bp->bp_file) > 0)
if (
#if defined(CONFIG_CMD_DHCP)
!(dhcp_option_overload & OVERLOAD_FILE) &&
#endif
(strlen(bp->bp_file) > 0)) {
copy_filename(net_boot_file_name, bp->bp_file,
sizeof(net_boot_file_name));
}
debug("net_boot_file_name: %s\n", net_boot_file_name);
@ -772,6 +780,7 @@ static void dhcp_process_options(uchar *popt, struct bootp_hdr *bp)
#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
int *to_ptr;
#endif
dhcp_option_overload = 0;
while (popt < end && *popt != 0xff) {
oplen = *(popt + 1);
@ -823,6 +832,9 @@ static void dhcp_process_options(uchar *popt, struct bootp_hdr *bp)
case 51:
net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
break;
case 52:
dhcp_option_overload = popt[2];
break;
case 53: /* Ignore Message Type Option */
break;
case 54:
@ -834,31 +846,11 @@ static void dhcp_process_options(uchar *popt, struct bootp_hdr *bp)
break;
case 66: /* Ignore TFTP server name */
break;
case 67: /* vendor opt bootfile */
/*
* I can't use dhcp_vendorex_proc here because I need
* to write into the bootp packet - even then I had to
* pass the bootp packet pointer into here as the
* second arg
*/
size = truncate_sz("Opt Boot File",
sizeof(bp->bp_file),
oplen);
if (bp->bp_file[0] == '\0' && size > 0) {
/*
* only use vendor boot file if we didn't
* receive a boot file in the main non-vendor
* part of the packet - god only knows why
* some vendors chose not to use this perfectly
* good spot to store the boot file (join on
* Tru64 Unix) it seems mind bogglingly crazy
* to me
*/
printf("*** WARNING: using vendor "
"optional boot file\n");
memcpy(bp->bp_file, popt + 2, size);
bp->bp_file[size] = '\0';
}
case 67: /* Bootfile option */
size = truncate_sz("Bootfile",
sizeof(net_boot_file_name), oplen);
memcpy(&net_boot_file_name, popt + 2, size);
net_boot_file_name[size] = 0;
break;
default:
#if defined(CONFIG_BOOTP_VENDOREX)