mirror of
https://github.com/m-labs/artiq.git
synced 2024-12-30 13:43:35 +08:00
216 lines
5.0 KiB
C
216 lines
5.0 KiB
C
#include <generated/csr.h>
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#ifdef CSR_ETHMAC_BASE
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#include <netif/etharp.h>
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#include <netif/liteethif.h>
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#include <lwip/init.h>
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#include <lwip/memp.h>
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#include <lwip/ip4_addr.h>
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#include <lwip/ip4.h>
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#include <lwip/netif.h>
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#include <lwip/sys.h>
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#include <lwip/tcp.h>
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#include <lwip/timers.h>
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#include "session.h"
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#include "kserver.h"
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struct kserver_connstate {
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int magic_recognized;
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struct pbuf *rp;
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int rp_offset;
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};
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static struct kserver_connstate *cs_new(void)
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{
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struct kserver_connstate *cs;
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cs = (struct kserver_connstate *)mem_malloc(sizeof(struct kserver_connstate));
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if(!cs)
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return NULL;
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cs->magic_recognized = 0;
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cs->rp = NULL;
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cs->rp_offset = 0;
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return cs;
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}
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static void cs_free(struct kserver_connstate *cs)
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{
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if(cs->rp)
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pbuf_free(cs->rp);
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mem_free(cs);
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}
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static const char kserver_magic[] = "ARTIQ coredev\n";
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static int magic_ok(struct kserver_connstate *cs)
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{
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return cs->magic_recognized >= 14;
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}
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static struct kserver_connstate *active_cs;
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static struct tcp_pcb *active_pcb;
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static void kserver_close(struct kserver_connstate *cs, struct tcp_pcb *pcb)
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{
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if(cs == active_cs) {
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session_end();
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active_cs = NULL;
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active_pcb = NULL;
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}
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/* lwip loves to call back with broken pointers. Prevent that. */
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tcp_arg(pcb, NULL);
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tcp_recv(pcb, NULL);
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tcp_sent(pcb, NULL);
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tcp_err(pcb, NULL);
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cs_free(cs);
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tcp_close(pcb);
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}
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static err_t kserver_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
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{
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struct kserver_connstate *cs;
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cs = (struct kserver_connstate *)arg;
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if(p) {
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if(cs->rp)
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pbuf_cat(cs->rp, p);
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else {
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cs->rp = p;
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cs->rp_offset = 0;
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}
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} else
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kserver_close(cs, pcb);
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return ERR_OK;
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}
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static err_t kserver_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
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{
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session_ack_mem(len);
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return ERR_OK;
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}
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static void tcp_pcb_service(void *arg, struct tcp_pcb *pcb)
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{
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struct kserver_connstate *cs;
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int remaining_in_pbuf;
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char *rpp;
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struct pbuf *next;
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int r;
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cs = (struct kserver_connstate *)arg;
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while(cs->rp) {
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remaining_in_pbuf = cs->rp->len - cs->rp_offset;
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rpp = (char *)cs->rp->payload;
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while(remaining_in_pbuf > 0) {
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if(cs == active_cs) {
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r = session_input(&rpp[cs->rp_offset], remaining_in_pbuf);
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if(r > 0) {
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tcp_recved(pcb, r);
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cs->rp_offset += r;
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remaining_in_pbuf -= r;
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} else if(r == 0)
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return;
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else
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kserver_close(cs, pcb);
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} else {
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if(rpp[cs->rp_offset] == kserver_magic[cs->magic_recognized]) {
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cs->magic_recognized++;
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if(magic_ok(cs)) {
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if(active_cs)
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kserver_close(active_cs, active_pcb);
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session_start();
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active_cs = cs;
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active_pcb = pcb;
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tcp_sent(pcb, kserver_sent);
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}
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} else {
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kserver_close(cs, pcb);
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return;
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}
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remaining_in_pbuf--;
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cs->rp_offset++;
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tcp_recved(pcb, 1);
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}
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}
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next = cs->rp->next;
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if(cs->rp->tot_len != cs->rp->len) {
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pbuf_ref(next);
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pbuf_free(cs->rp);
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cs->rp = next;
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cs->rp_offset = 0;
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} else {
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pbuf_free(cs->rp);
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cs->rp = NULL;
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}
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}
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}
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static void kserver_err(void *arg, err_t err)
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{
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struct kserver_connstate *cs;
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cs = (struct kserver_connstate *)arg;
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cs_free(cs);
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}
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static struct tcp_pcb *listen_pcb;
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static err_t kserver_accept(void *arg, struct tcp_pcb *newpcb, err_t err)
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{
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struct kserver_connstate *cs;
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cs = cs_new();
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if(!cs)
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return ERR_MEM;
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tcp_accepted(listen_pcb);
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tcp_arg(newpcb, cs);
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tcp_recv(newpcb, kserver_recv);
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tcp_err(newpcb, kserver_err);
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return ERR_OK;
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}
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void kserver_init(void)
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{
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listen_pcb = tcp_new();
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tcp_bind(listen_pcb, IP_ADDR_ANY, 1381);
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listen_pcb = tcp_listen(listen_pcb);
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tcp_accept(listen_pcb, kserver_accept);
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}
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extern struct tcp_pcb *tcp_active_pcbs;
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void kserver_service(void)
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{
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struct tcp_pcb *pcb;
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void *data;
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int len, sndbuf;
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/* Assume all active TCP PCBs with a non-NULL arg are our connections. */
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pcb = tcp_active_pcbs;
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while(pcb) {
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if(pcb->callback_arg)
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tcp_pcb_service(pcb->callback_arg, pcb);
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pcb = pcb->next;
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}
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if(active_cs) {
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session_poll(&data, &len);
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if(len > 0) {
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sndbuf = tcp_sndbuf(active_pcb);
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if(len > sndbuf)
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len = sndbuf;
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tcp_write(active_pcb, data, len, 0);
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session_ack_data(len);
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}
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if(len < 0)
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kserver_close(active_cs, active_pcb);
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}
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}
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#endif /* CSR_ETHMAC_BASE */
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