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| author | user <user@clank> | 2026-07-17 12:54:43 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-17 12:54:43 +0200 |
| commit | 26a2ccb8368a9968b6ec16068ad68dd0edb40641 (patch) | |
| tree | 1396180dc2a8e635c58e10b994ae15fe7705e542 /src/programs.asm | |
| parent | net: proper socket API in the kernel (SYS_NET) - no more SLIP in userland (diff) | |
| download | gbos-26a2ccb8368a9968b6ec16068ad68dd0edb40641.tar.gz gbos-26a2ccb8368a9968b6ec16068ad68dd0edb40641.tar.xz gbos-26a2ccb8368a9968b6ec16068ad68dd0edb40641.zip | |
net: UDP sockets in the kernel + a DNS resolver (real hostname lookups)
Adds UDP to the kernel socket layer on top of the ICMP core:
- net_sum() (raw folded sum) split out of net_cksum() so a UDP pseudo-header
(src/dst IP + proto + length) can seed the segment checksum.
- udp_send: builds IP+UDP with the pseudo-header checksum; NET_BIND sets the
local/source port; net_connect sets the peer.
- udp_in: demuxes inbound UDP by destination port to the bound socket
(net_find_udp), delivers the payload + source addr.
Also fixes a real recv bug: net_pump clobbers BC/DE/HL, so the old recv timeout
counted in registers and was effectively random. recv now counts in WRAM.
New `nslookup HOST` (PROG_NSLOOKUP=28, bank 30): builds a DNS A query and parses
the answer (with 0xC0 name-compression) entirely in userland over a UDP socket -
the kernel never sees DNS, just UDP. Verified through the bridge NAT:
/# nslookup example.com -> example.com -> 172.66.147.243
This gives us name resolution for the TCP/HTTP demo next.
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 854b2d2..9ae7f58 100644 --- a/src/programs.asm +++ b/src/programs.asm @@ -124,6 +124,9 @@ ProgNetd: SECTION "prog_ping", ROMX[$4000], BANK[29] ProgPing: INCBIN "c/ping.bin" +SECTION "prog_nslookup", ROMX[$4000], BANK[30] +ProgNslookup: + INCBIN "c/nslookup.bin" ; ----------------------------------------------------------------------------- ; PROG_SH (bank 3) - the shell, now written in C (c/sh.c): parses >/</| and @@ -222,6 +225,8 @@ ProgramTable:: dw ProgNetd db LOW(BANK(ProgPing)), HIGH(BANK(ProgPing)) dw ProgPing + db LOW(BANK(ProgNslookup)), HIGH(BANK(ProgNslookup)) + dw ProgNslookup ; ----------------------------------------------------------------------------- ; NameTable (ROM0) - command name -> program id, searched by sys_lookup. @@ -284,4 +289,6 @@ NameTable:: db PROG_NETD db "ping", 0 db PROG_PING + db "nslookup", 0 + db PROG_NSLOOKUP db 0 |