diff options
Diffstat (limited to 'tinyusb/lib/networking/dhserver.c')
| -rwxr-xr-x | tinyusb/lib/networking/dhserver.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/tinyusb/lib/networking/dhserver.c b/tinyusb/lib/networking/dhserver.c new file mode 100755 index 00000000..9287858e --- /dev/null +++ b/tinyusb/lib/networking/dhserver.c @@ -0,0 +1,348 @@ +/* + * The MIT License (MIT) + * + * Copyright (c) 2015 by Sergey Fetisov <fsenok@gmail.com> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include "dhserver.h" + +/* DHCP message type */ +#define DHCP_DISCOVER 1 +#define DHCP_OFFER 2 +#define DHCP_REQUEST 3 +#define DHCP_DECLINE 4 +#define DHCP_ACK 5 +#define DHCP_NAK 6 +#define DHCP_RELEASE 7 +#define DHCP_INFORM 8 + +/* DHCP options */ +enum DHCP_OPTIONS +{ + DHCP_PAD = 0, + DHCP_SUBNETMASK = 1, + DHCP_ROUTER = 3, + DHCP_DNSSERVER = 6, + DHCP_HOSTNAME = 12, + DHCP_DNSDOMAIN = 15, + DHCP_MTU = 26, + DHCP_BROADCAST = 28, + DHCP_PERFORMROUTERDISC = 31, + DHCP_STATICROUTE = 33, + DHCP_NISDOMAIN = 40, + DHCP_NISSERVER = 41, + DHCP_NTPSERVER = 42, + DHCP_VENDOR = 43, + DHCP_IPADDRESS = 50, + DHCP_LEASETIME = 51, + DHCP_OPTIONSOVERLOADED = 52, + DHCP_MESSAGETYPE = 53, + DHCP_SERVERID = 54, + DHCP_PARAMETERREQUESTLIST = 55, + DHCP_MESSAGE = 56, + DHCP_MAXMESSAGESIZE = 57, + DHCP_RENEWALTIME = 58, + DHCP_REBINDTIME = 59, + DHCP_CLASSID = 60, + DHCP_CLIENTID = 61, + DHCP_USERCLASS = 77, /* RFC 3004 */ + DHCP_FQDN = 81, + DHCP_DNSSEARCH = 119, /* RFC 3397 */ + DHCP_CSR = 121, /* RFC 3442 */ + DHCP_MSCSR = 249, /* MS code for RFC 3442 */ + DHCP_END = 255 +}; + +typedef struct +{ + uint8_t dp_op; /* packet opcode type */ + uint8_t dp_htype; /* hardware addr type */ + uint8_t dp_hlen; /* hardware addr length */ + uint8_t dp_hops; /* gateway hops */ + uint32_t dp_xid; /* transaction ID */ + uint16_t dp_secs; /* seconds since boot began */ + uint16_t dp_flags; + uint8_t dp_ciaddr[4]; /* client IP address */ + uint8_t dp_yiaddr[4]; /* 'your' IP address */ + uint8_t dp_siaddr[4]; /* server IP address */ + uint8_t dp_giaddr[4]; /* gateway IP address */ + uint8_t dp_chaddr[16]; /* client hardware address */ + uint8_t dp_legacy[192]; + uint8_t dp_magic[4]; + uint8_t dp_options[275]; /* options area */ +} DHCP_TYPE; + +DHCP_TYPE dhcp_data; +static struct udp_pcb *pcb = NULL; +static const dhcp_config_t *config = NULL; + +char magic_cookie[] = {0x63,0x82,0x53,0x63}; + +static ip_addr_t get_ip(const uint8_t *pnt) +{ + ip_addr_t result; + memcpy(&result, pnt, sizeof(result)); + return result; +} + +static void set_ip(uint8_t *pnt, ip_addr_t value) +{ + memcpy(pnt, &value.addr, sizeof(value.addr)); +} + +static dhcp_entry_t *entry_by_ip(ip_addr_t ip) +{ + int i; + for (i = 0; i < config->num_entry; i++) + if (config->entries[i].addr.addr == ip.addr) + return &config->entries[i]; + return NULL; +} + +static dhcp_entry_t *entry_by_mac(uint8_t *mac) +{ + int i; + for (i = 0; i < config->num_entry; i++) + if (memcmp(config->entries[i].mac, mac, 6) == 0) + return &config->entries[i]; + return NULL; +} + +static __inline bool is_vacant(dhcp_entry_t *entry) +{ + return memcmp("\0\0\0\0\0", entry->mac, 6) == 0; +} + +static dhcp_entry_t *vacant_address(void) +{ + int i; + for (i = 0; i < config->num_entry; i++) + if (is_vacant(config->entries + i)) + return config->entries + i; + return NULL; +} + +static __inline void free_entry(dhcp_entry_t *entry) +{ + memset(entry->mac, 0, 6); +} + +uint8_t *find_dhcp_option(uint8_t *attrs, int size, uint8_t attr) +{ + int i = 0; + while ((i + 1) < size) + { + int next = i + attrs[i + 1] + 2; + if (next > size) return NULL; + if (attrs[i] == attr) + return attrs + i; + i = next; + } + return NULL; +} + +int fill_options(void *dest, + uint8_t msg_type, + const char *domain, + ip_addr_t dns, + int lease_time, + ip_addr_t serverid, + ip_addr_t router, + ip_addr_t subnet) +{ + uint8_t *ptr = (uint8_t *)dest; + /* ACK message type */ + *ptr++ = 53; + *ptr++ = 1; + *ptr++ = msg_type; + + /* dhcp server identifier */ + *ptr++ = DHCP_SERVERID; + *ptr++ = 4; + set_ip(ptr, serverid); + ptr += 4; + + /* lease time */ + *ptr++ = DHCP_LEASETIME; + *ptr++ = 4; + *ptr++ = (lease_time >> 24) & 0xFF; + *ptr++ = (lease_time >> 16) & 0xFF; + *ptr++ = (lease_time >> 8) & 0xFF; + *ptr++ = (lease_time >> 0) & 0xFF; + + /* subnet mask */ + *ptr++ = DHCP_SUBNETMASK; + *ptr++ = 4; + set_ip(ptr, subnet); + ptr += 4; + + /* router */ + if (router.addr != 0) + { + *ptr++ = DHCP_ROUTER; + *ptr++ = 4; + set_ip(ptr, router); + ptr += 4; + } + + /* domain name */ + if (domain != NULL) + { + int len = strlen(domain); + *ptr++ = DHCP_DNSDOMAIN; + *ptr++ = len; + memcpy(ptr, domain, len); + ptr += len; + } + + /* domain name server (DNS) */ + if (dns.addr != 0) + { + *ptr++ = DHCP_DNSSERVER; + *ptr++ = 4; + set_ip(ptr, dns); + ptr += 4; + } + + /* end */ + *ptr++ = DHCP_END; + return ptr - (uint8_t *)dest; +} + +static void udp_recv_proc(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port) +{ + uint8_t *ptr; + dhcp_entry_t *entry; + struct pbuf *pp; + struct netif *netif = netif_get_by_index(p->if_idx); + + (void)arg; + (void)addr; + + unsigned n = p->len; + if (n > sizeof(dhcp_data)) n = sizeof(dhcp_data); + memcpy(&dhcp_data, p->payload, n); + switch (dhcp_data.dp_options[2]) + { + case DHCP_DISCOVER: + entry = entry_by_mac(dhcp_data.dp_chaddr); + if (entry == NULL) entry = vacant_address(); + if (entry == NULL) break; + + dhcp_data.dp_op = 2; /* reply */ + dhcp_data.dp_secs = 0; + dhcp_data.dp_flags = 0; + set_ip(dhcp_data.dp_yiaddr, entry->addr); + memcpy(dhcp_data.dp_magic, magic_cookie, 4); + + memset(dhcp_data.dp_options, 0, sizeof(dhcp_data.dp_options)); + + fill_options(dhcp_data.dp_options, + DHCP_OFFER, + config->domain, + config->dns, + entry->lease, + *netif_ip4_addr(netif), + config->router, + *netif_ip4_netmask(netif)); + + pp = pbuf_alloc(PBUF_TRANSPORT, sizeof(dhcp_data), PBUF_POOL); + if (pp == NULL) break; + memcpy(pp->payload, &dhcp_data, sizeof(dhcp_data)); + udp_sendto(upcb, pp, IP_ADDR_BROADCAST, port); + pbuf_free(pp); + break; + + case DHCP_REQUEST: + /* 1. find requested ipaddr in option list */ + ptr = find_dhcp_option(dhcp_data.dp_options, sizeof(dhcp_data.dp_options), DHCP_IPADDRESS); + if (ptr == NULL) break; + if (ptr[1] != 4) break; + ptr += 2; + + /* 2. does hw-address registered? */ + entry = entry_by_mac(dhcp_data.dp_chaddr); + if (entry != NULL) free_entry(entry); + + /* 3. find requested ipaddr */ + entry = entry_by_ip(get_ip(ptr)); + if (entry == NULL) break; + if (!is_vacant(entry)) break; + + /* 4. fill struct fields */ + memcpy(dhcp_data.dp_yiaddr, ptr, 4); + dhcp_data.dp_op = 2; /* reply */ + dhcp_data.dp_secs = 0; + dhcp_data.dp_flags = 0; + memcpy(dhcp_data.dp_magic, magic_cookie, 4); + + /* 5. fill options */ + memset(dhcp_data.dp_options, 0, sizeof(dhcp_data.dp_options)); + + fill_options(dhcp_data.dp_options, + DHCP_ACK, + config->domain, + config->dns, + entry->lease, + *netif_ip4_addr(netif), + config->router, + *netif_ip4_netmask(netif)); + + /* 6. send ACK */ + pp = pbuf_alloc(PBUF_TRANSPORT, sizeof(dhcp_data), PBUF_POOL); + if (pp == NULL) break; + memcpy(entry->mac, dhcp_data.dp_chaddr, 6); + memcpy(pp->payload, &dhcp_data, sizeof(dhcp_data)); + udp_sendto(upcb, pp, IP_ADDR_BROADCAST, port); + pbuf_free(pp); + break; + + default: + break; + } + pbuf_free(p); +} + +err_t dhserv_init(const dhcp_config_t *c) +{ + err_t err; + udp_init(); + dhserv_free(); + pcb = udp_new(); + if (pcb == NULL) + return ERR_MEM; + err = udp_bind(pcb, IP_ADDR_ANY, c->port); + if (err != ERR_OK) + { + dhserv_free(); + return err; + } + udp_recv(pcb, udp_recv_proc, NULL); + config = c; + return ERR_OK; +} + +void dhserv_free(void) +{ + if (pcb == NULL) return; + udp_remove(pcb); + pcb = NULL; +} |