dhcps.h 文件参考

浏览源代码.

函数
err_t	dhcps_start (struct netif *netif, const char *start_ip, u16_t ip_num)
void	dhcps_stop (struct netif *netif)

函数说明

dhcps_start()

err_t dhcps_start	(	struct netif *	netif,
		const char *	start_ip,
		u16_t	ip_num
	)

在文件 dhcps.c 第 857 行定义.

{
    struct dhcps *dhcps = NULL;
    ip4_addr_t address_in_hton;
    int err;
 
    LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG);
    dhcps = netif_get_dhcps(netif);
 
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
                ("dhcps_start(netif=%p) %s\n", (void *)netif, netif_get_name(netif)));
 
    if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
                    ("MTU =%"U16_F",DHCP Msg Len Required =%"U32_F"\n", netif->mtu, DHCP_MAX_MSG_LEN_MIN_REQUIRED));
        return ERR_MEM;
    }
 
    if (dhcps != NULL) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcps_start(): DHCP Server is already started\n"));
        return ERR_MEM;
    }
 
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcps_start(): starting new DHCP Server\n"));
    dhcps = (struct dhcps *)mem_malloc(sizeof(struct dhcps));
    if (dhcps == NULL) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcps_start(): could not allocate dhcp\n"));
        return ERR_MEM;
    }
 
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcps_start(): allocated dhcp"));
 
    (void)memset_s(dhcps, sizeof(struct dhcps), 0, sizeof(struct dhcps));
 
    dhcps->pcb = udp_new();
    if (dhcps->pcb == NULL) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate pcb\n"));
        mem_free((void *)dhcps);
        return ERR_MEM;
    }
 
#if LWIP_SO_BINDTODEVICE
    /* bind dhcp udp_pcb to specific netif, this could make dhcp server start on multiple netif */
    dhcps->pcb->ifindex = netif->ifindex;
#endif
    if ((start_ip == NULL) || (ip_num == 0)) {
        /* use default ip lease configuration. */
        dhcps->start_addr.addr = ntohl(ip_2_ip4(&netif->ip_addr)->addr & ip_2_ip4(&netif->netmask)->addr) + 1;
        dhcps->end_addr.addr = ntohl(ip_2_ip4(&netif->ip_addr)->addr | (~ip_2_ip4(&netif->netmask)->addr)) - 1;
        dhcps->lease_num = (u8_t)(dhcps->end_addr.addr - dhcps->start_addr.addr + 1);
        if (dhcps->lease_num > LWIP_DHCPS_MAX_LEASE) {
            dhcps->lease_num = LWIP_DHCPS_MAX_LEASE;
            dhcps->end_addr.addr = dhcps->start_addr.addr + LWIP_DHCPS_MAX_LEASE - 1;
        }
    } else {
        dhcps->start_addr.addr = ntohl(ipaddr_addr(start_ip));
        dhcps->end_addr.addr = (u32_t)(dhcps->start_addr.addr +
                                       (u32_t)(LWIP_MIN(ip_num - 1, LWIP_DHCPS_MAX_LEASE - 1)));
 
        ip4_addr_set_hton(&address_in_hton, &dhcps->start_addr);
 
        if (!ip4_addr_netcmp((&address_in_hton), ip_2_ip4(&netif->ip_addr), ip_2_ip4(&netif->netmask)) ||
            ip4_addr_isbroadcast((&address_in_hton), netif)) {
            LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): %s in not a valid ip lease\n", start_ip));
            udp_remove(dhcps->pcb);
            mem_free((void *)dhcps);
            return ERR_ARG;
        }
 
        ip4_addr_set_hton(&address_in_hton, &dhcps->end_addr);
 
        if (!ip4_addr_netcmp((&address_in_hton), ip_2_ip4(&netif->ip_addr), ip_2_ip4(&netif->netmask)) ||
            ip4_addr_isbroadcast((&address_in_hton), netif)) {
            dhcps->end_addr.addr = ntohl(ip_2_ip4(&netif->ip_addr)->addr | (~ip_2_ip4(&netif->netmask)->addr)) - 1;
        }
        dhcps->lease_num = (u8_t)(dhcps->end_addr.addr - dhcps->start_addr.addr + 1);
    }
 
    dhcps->netif = netif;
    dhcps->pcb->so_options |= SOF_BROADCAST;
    err = udp_bind(dhcps->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
    if (err != ERR_OK) {
        udp_remove(dhcps->pcb);
        mem_free((void *)dhcps);
        return ERR_MEM;
    }
 
    err = udp_connect(dhcps->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
    if (err != ERR_OK) {
        udp_remove(dhcps->pcb);
        mem_free((void *)dhcps);
        return ERR_MEM;
    }
    udp_recv(dhcps->pcb, dhcps_recv, netif);
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcps_start(): starting DHCPS Successfully\n"));
#ifdef  LWIP_DEV_DEBUG
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
                ("dhcps_start(): DHCPS Conf:: netif addr = %"U32_F" dhcps start addr%"U32_F" dhcp end addr%"U32_F"\n",
                ip_2_ip4(&netif->ip_addr)->addr, dhcps->start_addr.addr, dhcps->end_addr.addr));
#endif
    LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
                ("dhcps_start(): DHCPS Lease Conf:: Lease Time = %"U32_F" Offer Time = %"U32_F"\n",
                    LWIP_DHCPS_LEASE_TIME, LWIP_DHCPS_OFFER_TIME));
    netif_set_dhcps(netif, dhcps);
    return ERR_OK;
}

函数调用图:

这是这个函数的调用关系图:

dhcps_stop()

void dhcps_stop

(

struct netif *

netif

)

在文件 dhcps.c 第 964 行定义.

{
    LWIP_ERROR("dhcps_stop: netif != NULL", (netif != NULL), return);
    struct dhcps *dhcps = netif_get_dhcps(netif);
    if (dhcps != NULL) {
        LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcps_stop(): Stopping DHCP Server\n"));
        if (dhcps->pcb != NULL) {
            LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcps_stop(): Removing UDP PCB\n"));
            udp_remove(dhcps->pcb);
            dhcps->pcb = NULL;
        }
 
        mem_free(dhcps);
        netif_set_dhcps(netif, NULL);
    }
}

这是这个函数的调用关系图: