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This commit is contained in:
Markus Fröschle
2015-04-07 10:16:55 +00:00
parent 8051f2a4cc
commit e093e63c7a
1 changed files with 69 additions and 69 deletions
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138
BaS_gcc/net/bootp.c
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@@ -18,101 +18,101 @@
#define dbg(format, arg...) do { ; } while (0) #define dbg(format, arg...) do { ; } while (0)
#endif /* DBG_BOOTP */ #endif /* DBG_BOOTP */
#define TIMER_NETWORK 3 /* defines GPT3 as timer for this function */ #define TIMER_NETWORK 3 /* defines GPT3 as timer for this function */
static struct bootp_connection connection; static struct bootp_connection connection;
#define XID 0x1234 /* this is arbitrary */ #define XID 0x1234 /* this is arbitrary */
#define MAX_TRIES 5 /* since UDP can fail */ #define MAX_TRIES 5 /* since UDP can fail */
void bootp_request(NIF *nif, uint8_t *pa) void bootp_request(NIF *nif, uint8_t *pa)
{ {
/* /*
* This function broadcasts a BOOTP request for the protocol * This function broadcasts a BOOTP request for the protocol
* address "pa" * address "pa"
*/ */
uint8_t *addr; uint8_t *addr;
IP_ADDR broadcast = {255, 255, 255, 255}; IP_ADDR broadcast = {255, 255, 255, 255};
NBUF *nbuf; NBUF *nbuf;
struct bootp_packet *p; struct bootp_packet *p;
int i, result; int i, result;
nbuf = nbuf_alloc(); nbuf = nbuf_alloc();
if (nbuf == NULL) if (nbuf == NULL)
{ {
xprintf("%s: couldn't allocate Tx buffer\r\n", __FUNCTION__); xprintf("%s: couldn't allocate Tx buffer\r\n", __FUNCTION__);
return; return;
} }
p = (struct bootp_packet *) &nbuf->data[BOOTP_HDR_OFFSET]; p = (struct bootp_packet *) &nbuf->data[BOOTP_HDR_OFFSET];
/* Build the BOOTP request packet */ /* Build the BOOTP request packet */
p->type = BOOTP_TYPE_BOOTREQUEST; p->type = BOOTP_TYPE_BOOTREQUEST;
p->htype = BOOTP_HTYPE_ETHERNET; p->htype = BOOTP_HTYPE_ETHERNET;
p->hlen = BOOTP_HLEN_ETHERNET; p->hlen = BOOTP_HLEN_ETHERNET;
p->hops = 0; p->hops = 0;
p->xid = XID; p->xid = XID;
p->secs = 1; p->secs = 1;
p->flags = BOOTP_FLAGS_BROADCAST; p->flags = BOOTP_FLAGS_BROADCAST;
p->cl_addr = 0x0; p->cl_addr = 0x0;
p->yi_addr = 0x0; p->yi_addr = 0x0;
p->gi_addr = 0x0; p->gi_addr = 0x0;
connection.nif = nif; connection.nif = nif;
addr = &nif->hwa[0]; addr = &nif->hwa[0];
for (i = 0; i < 6; i++) for (i = 0; i < 6; i++)
p->ch_addr[i] = addr[i]; p->ch_addr[i] = addr[i];
nbuf->length = BOOTP_PACKET_LEN; nbuf->length = BOOTP_PACKET_LEN;
/* setup reply handler */ /* setup reply handler */
udp_bind_port(BOOTP_CLIENT_PORT, bootp_handler); udp_bind_port(BOOTP_CLIENT_PORT, bootp_handler);
for (i = 0; i < MAX_TRIES; i++) for (i = 0; i < MAX_TRIES; i++)
{ {
/* Send the BOOTP request */ /* Send the BOOTP request */
result = udp_send(connection.nif, broadcast, BOOTP_CLIENT_PORT, result = udp_send(connection.nif, broadcast, BOOTP_CLIENT_PORT,
BOOTP_SERVER_PORT, nbuf); BOOTP_SERVER_PORT, nbuf);
dbg("sent bootp request\r\n"); dbg("sent bootp request\r\n");
if (result == true) if (result == true)
break; break;
} }
/* release handler */ /* release handler */
udp_free_port(BOOTP_CLIENT_PORT); udp_free_port(BOOTP_CLIENT_PORT);
if (result == 0) if (result == 0)
nbuf_free(nbuf); nbuf_free(nbuf);
} }
void bootp_handler(NIF *nif, NBUF *nbuf) void bootp_handler(NIF *nif, NBUF *nbuf)
{ {
/* /*
* BOOTP protocol handler * BOOTP protocol handler
*/ */
uint8_t *addr; struct bootp_packet *rx_p;
struct bootp_packet *rx_p; udp_frame_hdr *udpframe;
udp_frame_hdr *udpframe;
(void) udpframe; /* FIXME: just to avoid compiler warning */
dbg("\r\n"); dbg("\r\n");
rx_p = (struct bootp_packet *) &nbuf->data[nbuf->offset]; rx_p = (struct bootp_packet *) &nbuf->data[nbuf->offset];
udpframe = (udp_frame_hdr *) &nbuf->data[nbuf->offset - UDP_HDR_SIZE]; udpframe = (udp_frame_hdr *) &nbuf->data[nbuf->offset - UDP_HDR_SIZE];
/* /*
* check packet if it is valid and if it is really intended for us * check packet if it is valid and if it is really intended for us
*/ */
if (rx_p->type == BOOTP_TYPE_BOOTREPLY && rx_p->xid == XID) if (rx_p->type == BOOTP_TYPE_BOOTREPLY && rx_p->xid == XID)
{ {
dbg("received bootp reply\r\n"); dbg("received bootp reply\r\n");
/* seems to be valid */ /* seems to be valid */
} }
else else
{ {
dbg("received invalid bootp reply\r\n"); dbg("received invalid bootp reply\r\n");
/* not valid */ /* not valid */
return; return;
} }
} }