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Introduce a way for boot programs to modify the behavior of

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bootp().  Add a BOOTP_PXE flag which causes bootp() to send
"PXEClient" in the DHCP class field.

Derived from similar code in FreeBSD.
This commit is contained in:
thorpej 2000-11-02 03:22:23 +00:00
parent 6a3b366a8c
commit 29b685b9f0
2 changed files with 34 additions and 4 deletions
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29
sys/lib/libsa/bootp.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: bootp.c,v 1.19 2000/03/30 12:19:47 augustss Exp $ */
/* $NetBSD: bootp.c,v 1.20 2000/11/02 03:22:23 thorpej Exp $ */
/*
* Copyright (c) 1992 Regents of the University of California.
@ -84,6 +84,12 @@ static char expected_dhcpmsgtype = -1, dhcp_ok;
struct in_addr dhcp_serverip;
#endif
/*
* Boot programs can patch this at run-time to change the behavior
* of bootp/dhcp.
*/
int bootp_flags;
/* Fetch required bootp infomation */
void
bootp(sock)
@ -130,7 +136,18 @@ bootp(sock)
bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
bp->bp_vend[5] = 1;
bp->bp_vend[6] = DHCPDISCOVER;
bp->bp_vend[7] = TAG_END;
/*
* If we are booting from PXE, we want to send the string
* "PXEClient" to the DHCP server in case it only wants to
* respond to PXE clients.
*/
if (bootp_flags & BOOTP_PXE) {
bp->bp_vend[7] = TAG_CLASSID;
bp->bp_vend[8] = 9;
bcopy("PXEClient", &bp->bp_vend[9], 9);
bp->bp_vend[18] = TAG_END;
} else
bp->bp_vend[7] = TAG_END;
#else
bp->bp_vend[4] = TAG_END;
#endif
@ -167,7 +184,13 @@ bootp(sock)
bp->bp_vend[20] = 4;
leasetime = htonl(300);
bcopy(&leasetime, &bp->bp_vend[21], 4);
bp->bp_vend[25] = TAG_END;
if (bootp_flags & BOOTP_PXE) {
bp->bp_vend[25] = TAG_CLASSID;
bp->bp_vend[26] = 9;
bcopy("PXEClient", &bp->bp_vend[27], 9);
bp->bp_vend[36] = TAG_END;
}
bp->bp_vend[25] = TAG_END;
expected_dhcpmsgtype = DHCPACK;

9
sys/lib/libsa/bootp.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: bootp.h,v 1.5 1999/02/11 09:10:43 pk Exp $ */
/* $NetBSD: bootp.h,v 1.6 2000/11/02 03:22:23 thorpej Exp $ */
/*
* Bootstrap Protocol (BOOTP). RFC951 and RFC1048.
@ -117,6 +117,13 @@ struct bootp {
#define DHCPRELEASE 7
#endif
extern int bootp_flags;
/*
* Flags for bootp_flags.
*/
#define BOOTP_PXE 0x01 /* we're a PXE client */
/*
* "vendor" data permitted for CMU bootp clients.
*/