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| author | user <user@clank> | 2026-07-17 14:11:22 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-17 14:11:22 +0200 |
| commit | a2cb756693229c7880d926d2cdde2f838c697415 (patch) | |
| tree | e327278e7d8b7150d7a2b01cf38b4895caab7356 /src/programs.asm | |
| parent | kernel: sys_sleep - a cooperative delay off the DIV timer (+ ping pacing) (diff) | |
| download | gbos-a2cb756693229c7880d926d2cdde2f838c697415.tar.gz gbos-a2cb756693229c7880d926d2cdde2f838c697415.tar.xz gbos-a2cb756693229c7880d926d2cdde2f838c697415.zip | |
net: DHCP client - lease the IP at boot instead of hardcoding it
The address is no longer baked in. net_init starts at 0.0.0.0; a DHCP client
runs as the first thing on boot (init/shell forks it and waits), and only once
it has a lease (or gives up) does the prompt appear.
Kernel:
- IP is configurable: 0.0.0.0 until leased; NET_SETIP op stores it.
- 16-bit frame length. DHCP/BOOTP packets are ~272 bytes, over the old 255-byte
frame cap, so net_slip_send takes a 16-bit length, net_pump assembles into a
320-byte buffer with a 16-bit wNetRxLen, and udp_send writes a 16-bit IP total.
Payloads stay <=255 (kept small on purpose) so the per-protocol datalen math
is unchanged. wNetTx/wNetRxBuf 256->320, SK_RXBUF 208->288.
Userland:
- c/dhcp.c: DISCOVER->OFFER->REQUEST->ACK over a UDP socket, then net_setip();
times out gracefully (shell still boots) if there's no server. sh.c runs it
before the prompt.
Bridge (self-contained DHCP server, no dnsmasq):
- tunbridge.py + netboot intercept UDP->:67 and answer OFFER/ACK leasing
10.0.0.2 (gateway 10.0.0.1); everything else is bridged/NATed as before.
Regression-tested ICMP/UDP/TCP after the 16-bit change. Verified end to end:
dhcp: discovering
dhcp: leased 10.0.0.2
/# ping 10.0.0.1 -> 4/4 (traffic from the leased address)
Diffstat (limited to '')
| -rw-r--r-- | src/programs.asm | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/programs.asm b/src/programs.asm index 9ae7f58..e89fe0c 100644 --- a/src/programs.asm +++ b/src/programs.asm @@ -127,6 +127,9 @@ ProgPing: SECTION "prog_nslookup", ROMX[$4000], BANK[30] ProgNslookup: INCBIN "c/nslookup.bin" +SECTION "prog_dhcp", ROMX[$4000], BANK[31] +ProgDhcp: + INCBIN "c/dhcp.bin" ; ----------------------------------------------------------------------------- ; PROG_SH (bank 3) - the shell, now written in C (c/sh.c): parses >/</| and @@ -227,6 +230,8 @@ ProgramTable:: dw ProgPing db LOW(BANK(ProgNslookup)), HIGH(BANK(ProgNslookup)) dw ProgNslookup + db LOW(BANK(ProgDhcp)), HIGH(BANK(ProgDhcp)) + dw ProgDhcp ; ----------------------------------------------------------------------------- ; NameTable (ROM0) - command name -> program id, searched by sys_lookup. @@ -291,4 +296,6 @@ NameTable:: db PROG_PING db "nslookup", 0 db PROG_NSLOOKUP + db "dhcp", 0 + db PROG_DHCP db 0 |