d7ce0d5856
- Created src/dhcp.h: DHCP packet struct, lease info struct, message types, options codes, client states, discover/receive/get_lease API - Created src/dhcp.c: DHCP client with DISCOVER/OFFER/REQUEST/ACK flow, manual IP+UDP header construction for broadcast, option parsing for subnet mask/router/DNS/lease time/server ID, lease table, auto-applies configuration to ethernet interface on ACK, sysfs /sys/dhcp/status - Created apps/dhcp/dhcp.c: reads /sys/dhcp/status to display DHCP info - Kernel calls dhcp_init() at boot - Tested: clean boot, DHCP initialized, dhcp app in CPIO
29 lines
543 B
C
29 lines
543 B
C
/**
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* @file dhcp.c
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* @brief Display DHCP status information.
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*
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* Reads DHCP lease information from /sys/dhcp/status and displays it.
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*
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* Usage:
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* dhcp - Show current DHCP status
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*/
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#include "syscalls.h"
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int main(void) {
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int32_t fd = open("/sys/dhcp/status", 0);
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if (fd < 0) {
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puts("dhcp: failed to open /sys/dhcp/status\n");
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return 1;
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}
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char buf[512];
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int32_t n;
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while ((n = read(fd, buf, sizeof(buf))) > 0) {
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write(1, buf, (uint32_t)n);
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}
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close(fd);
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return 0;
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}
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