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In multicast operation, the client still has a unicast local port.

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This commit is contained in:
Michael Brown 2005-06-02 10:15:40 +00:00
parent cbed5ed9ad
commit 7d8adc25bc
3 changed files with 102 additions and 94 deletions
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21
src/include/tftp.h
View File

@ -100,19 +100,18 @@ struct tftp_state {
* will be sent, and to which ACK packets should be sent.
*/
struct sockaddr_in server;
/** TFTP client address
/** TFTP client port
*
* The IP address, if any, is the multicast address to which
* data packets will be sent. The client will always send
* packets from its own IP address.
*
* The UDP port is the port from which the open request will
* be sent, and to which data packets will be sent. (Due to
* the "design" of the MTFTP protocol, the master client will
* receive its first data packet as unicast, and subsequent
* packets as multicast.)
* This is the UDP port from which the open request will be
* sent, and to which any unicast data packets will be sent.
*/
struct sockaddr_in client;
in_port_t lport;
/** TFTP multicast address
*
* This is the IP address and UDP port to which multicast data
* packets, if any, will be sent.
*/
struct sockaddr_in multicast;
/** Master client
*
* This will be true if the client is the master client for a

10
src/proto/tftm.c
View File

@ -14,20 +14,20 @@
static inline int tftm_process_opts ( struct tftp_state *state,
struct tftp_oack *oack ) {
struct in_addr old_mcast_addr = state->client.sin_addr;
struct in_addr old_mcast_addr = state->multicast.sin_addr;
if ( ! tftp_process_opts ( state, oack ) )
return 0;
if ( old_mcast_addr.s_addr != state->client.sin_addr.s_addr ) {
if ( old_mcast_addr.s_addr != state->multicast.sin_addr.s_addr ) {
if ( old_mcast_addr.s_addr ) {
DBG ( "TFTM: Leaving multicast group %@\n",
old_mcast_addr.s_addr );
leave_group ( IGMP_SERVER );
}
DBG ( "TFTM: Joining multicast group %@\n",
state->client.sin_addr.s_addr );
join_group ( IGMP_SERVER, state->client.sin_addr.s_addr );
state->multicast.sin_addr.s_addr );
join_group ( IGMP_SERVER, state->multicast.sin_addr.s_addr );
}
DBG ( "TFTM: I am a %s client\n",
@ -195,7 +195,7 @@ static int tftm ( char *url __unused, struct sockaddr_in *server, char *file,
rc = 1;
out:
if ( state.client.sin_addr.s_addr ) {
if ( state.multicast.sin_addr.s_addr ) {
leave_group ( IGMP_SERVER );
}
return rc;

165
src/proto/tftpcore.c
View File

@ -9,19 +9,20 @@
/**
* await_reply() filter for TFTP packets
*
* @v ptr Pointer to a struct tftp_state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::client::sin_addr Client multicast IP address, or 0.0.0.0
* @v tftp_state::client::sin_port Client UDP port
* @v ip IP header
* @v udp UDP header
* @ret True This is our TFTP packet
* @ret False This is not one of our TFTP packets
* @v ptr Pointer to a struct tftp_state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::lport Client UDP port
* @v tftp_state::multicast::sin_addr Multicast IP address, or 0.0.0.0
* @v tftp_state::multicast::sin_port Multicast UDP port, or 0
* @v ip IP header
* @v udp UDP header
* @ret True This is our TFTP packet
* @ret False This is not one of our TFTP packets
*
* Wait for a TFTP packet that is part of the current connection
* (i.e. comes from the TFTP server, has the correct destination port,
* and is addressed either to our IP address or to our multicast
* listening address).
* and is addressed either to our IP address and UDP port, or to our
* multicast listening address and UDP port).
*
* Use await_tftp() in code such as
*
@ -49,39 +50,42 @@ static int await_tftp ( int ival __unused, void *ptr,
ip->src.s_addr, state->server.sin_addr.s_addr );
return 0;
}
/* Packet must be addressed to the correct UDP port */
if ( ntohs ( udp->dest ) != state->client.sin_port ) {
DBG2 ( "TFTPCORE: to UDP port %d, not to TFTP port %d\n",
ntohs ( udp->dest ), state->client.sin_port );
return 0;
}
/* Packet must be addressed to us, or to our multicast
* listening address (if we have one).
/* Packet may be addressed to our IP address and unicast UDP
* port
*/
if ( ! ( ( ip->dest.s_addr == arptable[ARP_CLIENT].ipaddr.s_addr ) ||
( ( state->client.sin_addr.s_addr ) &&
( ip->dest.s_addr == state->client.sin_addr.s_addr ) ) ) ) {
DBG2 ( "TFTPCORE: to %@, not to %@ (or %@)\n",
ip->dest.s_addr, arptable[ARP_CLIENT].ipaddr.s_addr,
state->client.sin_addr.s_addr );
return 0;
if ( ( ip->dest.s_addr == arptable[ARP_CLIENT].ipaddr.s_addr ) &&
( ntohs ( udp->dest ) == state->lport ) ) {
return 1;
}
return 1;
/* Packet may be addressed to our multicast IP address and UDP
* port, if we have one
*/
if ( ( state->multicast.sin_addr.s_addr ) &&
( ip->dest.s_addr == state->multicast.sin_addr.s_addr ) &&
( ntohs ( udp->dest ) == state->multicast.sin_port ) ) {
return 1;
}
DBG2 ( "TFTPCORE: to %@:%d, not to %@:%d (or %@:%d)\n",
ip->dest.s_addr, ntohs ( udp->dest ),
arptable[ARP_CLIENT].ipaddr.s_addr, state->lport,
state->multicast.sin_addr.s_addr, state->multicast.sin_port );
return 0;
}
/**
* Retrieve a TFTP packet
*
* @v state TFTP transfer state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::client::sin_addr Client multicast IP address, or 0.0.0.0
* @v tftp_state::client::sin_port Client UDP port
* @v timeout Time to wait for a response
* @ret True Received a non-error response
* @ret False Received error response / no response
* @ret *reply The server's response, if any
* @err #PXENV_STATUS_TFTP_READ_TIMEOUT No response received in time
* @err other As set by tftp_set_errno()
* @v state TFTP transfer state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::lport Client UDP port
* @v tftp_state::multicast::sin_addr Multicast IP address, or 0.0.0.0
* @v tftp_state::multicast::sin_port Multicast UDP port, or 0
* @v timeout Time to wait for a response
* @ret True Received a non-error response
* @ret False Received error response / no response
* @ret *reply The server's response, if any
* @err #PXENV_STATUS_TFTP_READ_TIMEOUT No response received in time
* @err other As set by tftp_set_errno()
*
* Retrieve the next packet sent by the TFTP server, if any is sent
* within the specified timeout period. The packet is returned via
@ -121,15 +125,16 @@ int tftp_get ( struct tftp_state *state, long timeout,
* @v state TFTP transfer state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::server::sin_port TFTP server UDP port, or 0
* @v tftp_state::client::sin_addr Client multicast IP address, or 0.0.0.0
* @v tftp_state::client::sin_port Client UDP port, or 0
* @v tftp_state::lport Client UDP port, or 0
* @v tftp_state::multicast::sin_addr Multicast IP address, or 0.0.0.0
* @v tftp_state::multicast::sin_port Multicast UDP port, or 0
* @v tftp_state::blksize Requested blksize, or 0
* @v filename File name
* @v multicast Enable/disable rfc2090 multicast TFTP
* @ret True Received a non-error response
* @ret False Received error response / no response
* @ret tftp_state::server::sin_port TFTP server UDP port
* @ret tftp_state::client::sin_port Client UDP port
* @ret tftp_state::lport Client UDP port
* @ret tftp_state::blksize Always #TFTP_DEFAULT_BLKSIZE
* @ret *reply The server's response, if any
* @err #PXENV_STATUS_TFTP_OPEN_TIMEOUT TFTP open timed out
@ -144,32 +149,35 @@ int tftp_get ( struct tftp_state *state, long timeout,
* If tftp_state::server::sin_port is 0, the standard TFTP server port
* (#TFTP_PORT) will be used.
*
* If tftp_state::client::sin_addr is not 0.0.0.0, it will be used as
* a multicast listening address for replies from the TFTP server.
*
* If tftp_state::client::sin_port is 0, the standard mechanism of
* If tftp_state::lport is 0, the standard mechanism of
* using a new, unique port number for each TFTP request will be used.
*
* If tftp_state::multicast::sin_addr is not 0.0.0.0, it (and
* tftp_state::multicast::sin_port) will be used as a multicast
* listening address for replies from the TFTP server.
*
* For the various different types of TFTP server, you should treat
* tftp_state::client as follows:
* tftp_state::lport and tftp_state::multicast as follows:
*
* - Standard TFTP server: set tftp_state::client::sin_addr to
* 0.0.0.0 and tftp_state::client::sin_port to 0. tftp_open()
* will set tftp_state::client::sin_port to the assigned local UDP
* port.
* - Standard TFTP server: set tftp_state::lport to 0,
* tftp_state::multicast::sin_addr to 0.0.0.0 and
* tftp_state::multicast::sin_port to 0. tftp_open() will set
* tftp_state::lport to the assigned local UDP port.
*
* - TFTM server: set tftp_state::client::sin_addr to 0.0.0.0 and
* tftp_state::client::sin_port to 0. tftp_open() will set
* tftp_state::client::sin_port to the assigned local UDP port.
* (Your call to tftp_process_opts() will then overwrite both
* tftp_state::client::sin_addr and tftp_state::client::sin_port
* with the values return in the OACK packet.)
* - TFTM server: set tftp_state::lport to 0,
* tftp_state::multicast::sin_addr to 0.0.0.0 and
* tftp_state::multicast::sin_port to 0. tftp_open() will set
* tftp_state::lport to the assigned local UDP port. (Your call
* to tftp_process_opts() will then overwrite both
* tftp_state::multicast::sin_addr and
* tftp_state::multicast::sin_port with the values specified in
* the OACK packet.)
*
* - MTFTP server: set tftp_state::client::sin_addr to the client
* multicast address and tftp_state::client::sin_port to the
* client multicast port (both of which must be previously known,
* e.g. provided by a DHCP server). tftp_open() will not alter
* these values.
* - MTFTP server: set tftp_state::multicast::sin_addr to the
* multicast address and both tftp_state::lport and
* tftp_state::multicast::sin_port to the multicast port (both of
* which must be previously known, e.g. provided by a DHCP
* server). tftp_open() will not alter these values.
*
* If tftp_state::blksize is 0, the maximum blocksize
* (#TFTP_MAX_BLKSIZE) will be requested.
@ -216,7 +224,7 @@ int tftp_open ( struct tftp_state *state, const char *filename,
state->server.sin_port = TFTP_PORT;
/* Determine whether or not to use lport */
fixed_lport = state->client.sin_port;
fixed_lport = state->lport;
/* Set up RRQ */
rrq.opcode = htons ( TFTP_RRQ );
@ -240,15 +248,14 @@ int tftp_open ( struct tftp_state *state, const char *filename,
/* Set client UDP port, if not already fixed */
if ( ! fixed_lport )
state->client.sin_port = ++lport;
state->lport = ++lport;
/* Send the RRQ */
DBG ( "TFTPCORE: requesting %@:%d/%s from port %d\n",
state->server.sin_addr.s_addr, state->server.sin_port,
rrq.data, state->client.sin_port );
rrq.data, state->lport );
if ( ! udp_transmit ( state->server.sin_addr.s_addr,
state->client.sin_port,
state->server.sin_port,
state->lport, state->server.sin_port,
rrqlen, &rrq ) )
return 0;
@ -282,8 +289,8 @@ int tftp_open ( struct tftp_state *state, const char *filename,
* @ret False Options were not processed successfully
* @ret tftp_state::blksize Negotiated blksize
* @ret tftp_state::tsize File size (if known), or 0
* @ret tftp_state::client::sin_addr Client multicast IP address, or 0.0.0.0
* @ret tftp_state::client::sin_port Client UDP port
* @ret tftp_state::multicast::sin_addr Multicast IP address, or 0.0.0.0
* @ret tftp_state::multicast::sin_port Multicast UDP port, or 0
* @ret tftp_state::master Client is master
* @err EINVAL An invalid option value was encountered
*
@ -338,6 +345,7 @@ int tftp_process_opts ( struct tftp_state *state, struct tftp_oack *oack ) {
p++;
DBG ( "TFTPCORE: got tsize %d\n", state->tsize );
} else if ( strcasecmp ( "multicast", p ) == 0 ) {
p += 10;
char *e = strchr ( p, ',' );
if ( ( ! e ) || ( e >= end ) ) {
DBG ( "TFTPCORE: malformed multicast field "
@ -345,13 +353,14 @@ int tftp_process_opts ( struct tftp_state *state, struct tftp_oack *oack ) {
return 0;
}
/* IP address may be missing, in which case we
* should leave state->client.sin_addr
* should leave state->multicast.sin_addr
* unaltered.
*/
if ( e != p ) {
int rc;
*e = '\0';
rc = inet_aton ( p, &state->client.sin_addr );
rc = inet_aton ( p,
&state->multicast.sin_addr );
*e = ',';
if ( ! rc ) {
DBG ( "TFTPCORE: malformed multicast "
@ -362,15 +371,15 @@ int tftp_process_opts ( struct tftp_state *state, struct tftp_oack *oack ) {
p = e + 1;
/* UDP port may also be missing */
if ( *p != ',' ) {
state->client.sin_port = strtoul ( p, &p, 10 );
state->multicast.sin_port
= strtoul ( p, &p, 10 );
if ( *p != ',' ) {
DBG ( "TFTPCORE: garbage \"%s\" "
"after multicast port\n", p );
return 0;
}
} else {
p++;
}
p++;
/* "Master Client" must always be present */
state->master = strtoul ( p, &p, 10 );
if ( *p ) {
@ -380,8 +389,8 @@ int tftp_process_opts ( struct tftp_state *state, struct tftp_oack *oack ) {
}
p++;
DBG ( "TFTPCORE: got multicast %@:%d (%s)\n",
state->client.sin_addr.s_addr,
state->client.sin_port,
state->multicast.sin_addr.s_addr,
state->multicast.sin_port,
( state->master ? "master" : "not master" ) );
} else {
DBG ( "TFTPCORE: unknown option \"%s\"\n", p );
@ -404,7 +413,7 @@ int tftp_process_opts ( struct tftp_state *state, struct tftp_oack *oack ) {
* @v state TFTP transfer state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::server::sin_port TFTP server UDP port
* @v tftp_state::client::sin_port Client UDP port
* @v tftp_state::lport Client UDP port
* @v tftp_state::block Most recently received block number
* @ret True Acknowledgement packet was sent
* @ret False Acknowledgement packet was not sent
@ -422,7 +431,7 @@ int tftp_ack_nowait ( struct tftp_state *state ) {
ack.opcode = htons ( TFTP_ACK );
ack.block = htons ( state->block );
return udp_transmit ( state->server.sin_addr.s_addr,
state->client.sin_port, state->server.sin_port,
state->lport, state->server.sin_port,
sizeof ( ack ), &ack );
}
@ -432,7 +441,7 @@ int tftp_ack_nowait ( struct tftp_state *state ) {
* @v state TFTP transfer state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::server::sin_port TFTP server UDP port
* @v tftp_state::client::sin_port Client UDP port
* @v tftp_state::lport Client UDP port
* @v tftp_state::block Most recently received block number
* @ret True Received a non-error response
* @ret False Received error response / no response
@ -484,7 +493,7 @@ int tftp_ack ( struct tftp_state *state, union tftp_any **reply ) {
* @v state TFTP transfer state
* @v tftp_state::server::sin_addr TFTP server IP address
* @v tftp_state::server::sin_port TFTP server UDP port
* @v tftp_state::client::sin_port Client UDP port
* @v tftp_state::lport Client UDP port
* @v errcode TFTP error code
* @v errmsg Descriptive error string, or NULL
* @ret True Error packet was sent
@ -505,7 +514,7 @@ int tftp_error ( struct tftp_state *state, int errcode, const char *errmsg ) {
strncpy ( error.errmsg, errmsg ? errmsg : strerror ( errno ),
sizeof ( error.errmsg ) );
return udp_transmit ( state->server.sin_addr.s_addr,
state->client.sin_port, state->server.sin_port,
state->lport, state->server.sin_port,
sizeof ( error ), &error );
}