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udhcpc: in fill_envp, export BOOTP fields first

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-10-20 14:24:18 +02:00
parent cd4d78f525
commit fbca0c68a7
1 changed files with 36 additions and 18 deletions
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54
networking/udhcp/dhcpc.c
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@ -393,7 +393,7 @@ static char **fill_envp(struct dhcp_packet *packet)
if (i == DHCP_OPTION_OVERLOAD)
overload = *temp;
else if (i == DHCP_SUBNET)
envc++; /* for mton */
envc++; /* for $mask */
envc++;
/*if (i != DHCP_MESSAGE_TYPE)*/
FOUND_OPTS(i) |= BMASK(i);
@ -408,10 +408,42 @@ static char **fill_envp(struct dhcp_packet *packet)
if (!packet)
return envp;
/* Export BOOTP fields. Fields we don't (yet?) export:
* uint8_t op; // always BOOTREPLY
* uint8_t htype; // hardware address type. 1 = 10mb ethernet
* uint8_t hlen; // hardware address length
* uint8_t hops; // used by relay agents only
* uint32_t xid;
* uint16_t secs; // elapsed since client began acquisition/renewal
* uint16_t flags; // only one flag so far: bcast. Never set by server
* uint32_t ciaddr; // client IP (usually == yiaddr. can it be different
* // if during renew server wants to give us differn IP?)
* uint32_t gateway_nip; // relay agent IP address
* uint8_t chaddr[16]; // link-layer client hardware address (MAC)
* TODO: export gateway_nip as $giaddr?
*/
/* Most important one: yiaddr as $ip */
*curr = xmalloc(sizeof("ip=255.255.255.255"));
sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr);
putenv(*curr++);
if (packet->siaddr_nip) {
/* IP address of next server to use in bootstrap */
*curr = xmalloc(sizeof("siaddr=255.255.255.255"));
sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip);
putenv(*curr++);
}
if (!(overload & FILE_FIELD) && packet->file[0]) {
/* watch out for invalid packets */
*curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file);
putenv(*curr++);
}
if (!(overload & SNAME_FIELD) && packet->sname[0]) {
/* watch out for invalid packets */
*curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname);
putenv(*curr++);
}
/* Export known DHCP options */
opt_name = dhcp_option_strings;
i = 0;
while (*opt_name) {
@ -428,29 +460,14 @@ static char **fill_envp(struct dhcp_packet *packet)
/* Subnet option: make things like "$ip/$mask" possible */
uint32_t subnet;
move_from_unaligned32(subnet, temp);
*curr = xasprintf("mask=%d", mton(subnet));
*curr = xasprintf("mask=%u", mton(subnet));
putenv(*curr++);
}
next:
opt_name += strlen(opt_name) + 1;
i++;
}
if (packet->siaddr_nip) {
*curr = xmalloc(sizeof("siaddr=255.255.255.255"));
sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip);
putenv(*curr++);
}
if (!(overload & FILE_FIELD) && packet->file[0]) {
/* watch out for invalid packets */
*curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file);
putenv(*curr++);
}
if (!(overload & SNAME_FIELD) && packet->sname[0]) {
/* watch out for invalid packets */
*curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname);
putenv(*curr++);
}
/* Handle unknown options */
/* Export unknown options */
for (i = 0; i < 256;) {
BITMAP bitmap = FOUND_OPTS(i);
if (!bitmap) {
@ -472,6 +489,7 @@ static char **fill_envp(struct dhcp_packet *packet)
}
i++;
}
return envp;
}