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67 lines
1.8 KiB
Markdown
67 lines
1.8 KiB
Markdown
[← Home](../README.md) · [Networking](README.md)
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# Protocol Implementation — DHCP, DNS, HTTP
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## Overview
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With `bsdsocket.library` providing a BSD-compatible API, standard network protocols can be implemented using familiar patterns adapted for the Amiga's single-address-space, library-based architecture.
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---
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## DNS Resolution
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```c
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/* gethostbyname — provided by bsdsocket.library: */
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struct hostent *he = gethostbyname("www.amiga.org");
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if (he) {
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struct in_addr addr = *(struct in_addr *)he->h_addr;
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Printf("IP: %s\n", Inet_NtoA(addr.s_addr));
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}
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```
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---
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## HTTP Client (Minimal)
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```c
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LONG sock = socket(AF_INET, SOCK_STREAM, 0);
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struct hostent *he = gethostbyname("www.example.com");
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struct sockaddr_in sa;
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sa.sin_family = AF_INET;
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sa.sin_port = htons(80);
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CopyMem(he->h_addr, &sa.sin_addr, he->h_length);
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connect(sock, (struct sockaddr *)&sa, sizeof(sa));
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char req[] = "GET / HTTP/1.0\r\nHost: www.example.com\r\n\r\n";
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send(sock, req, strlen(req), 0);
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char buf[8192];
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LONG total = 0, n;
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while ((n = recv(sock, buf + total, sizeof(buf) - total - 1, 0)) > 0)
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total += n;
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buf[total] = 0;
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Printf("%s\n", buf);
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CloseSocket(sock);
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```
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---
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## DHCP Overview
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DHCP on Amiga is typically handled by the TCP/IP stack itself (Roadshow, Miami) or an external client (AmiTCP + `dhclient`). The sequence is standard:
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1. `DHCPDISCOVER` — broadcast on port 67
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2. `DHCPOFFER` — server responds with IP offer
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3. `DHCPREQUEST` — client accepts
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4. `DHCPACK` — server confirms; lease begins
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For MiSTer/FPGA cores with custom SANA-II drivers, DHCP is handled automatically once the SANA-II driver is online and the stack is configured for `IPTYPE=DHCP`.
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---
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## References
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- [bsdsocket.md](bsdsocket.md) — socket API reference
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- [tcp_ip_stacks.md](tcp_ip_stacks.md) — stack configuration
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