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Fixed known bug #28. The TFTP code no longer assumes a packed struct and

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thus works reliably on more platforms.
This commit is contained in:
Daniel Stenberg 2006-05-08 15:09:50 +00:00
parent b9cd73c76d
commit 6307e783d8
4 changed files with 57 additions and 61 deletions
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4
CHANGES
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@ -6,6 +6,10 @@
Changelog
Daniel (8 May 2006)
- Fixed known bug #28. The TFTP code no longer assumes a packed struct and
thus works reliably on more platforms.
Daniel (5 May 2006)
- Roland Blom filed bug report #1481217
(http://curl.haxx.se/bug/view.cgi?id=1481217), with follow-ups by Michele

1
RELEASE-NOTES
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@ -20,6 +20,7 @@ This release includes the following changes:
This release includes the following bugfixes:
o TFTP works in a more portable fashion (== on more platforms)
o WSAGetLastError() is now used (better) on Windows
o GnuTLS non-block case that could cause data trashing
o deflate code survives lack of zlib header

2
docs/KNOWN_BUGS
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@ -33,8 +33,6 @@ may have been fixed since this was written!
See http://curl.haxx.se/bug/view.cgi?id=1371118
28. The TFTP code is not portable and will fail on some architectures.
26. NTLM authentication using SSPI (on Windows) when (lib)curl is running in
"system context" will make it use wrong(?) user name - at least when compared
to what winhttp does. See http://curl.haxx.se/bug/view.cgi?id=1281867

111
lib/tftp.c
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@ -122,23 +122,7 @@ typedef enum {
} tftp_error_t;
typedef struct tftp_packet {
unsigned short event;
union {
struct {
unsigned char data[512];
} request;
struct {
unsigned short block;
unsigned char data[512];
} data;
struct {
unsigned short block;
} ack;
struct {
unsigned short code;
unsigned char data[512];
} error;
} u;
unsigned char data[516];
} tftp_packet_t;
typedef struct tftp_state_data {
@ -199,7 +183,8 @@ void tftp_set_timeouts(tftp_state_data_t *state)
/* Compute the re-start interval to suit the timeout */
state->retry_time = timeout/state->retry_max;
if(state->retry_time<1) state->retry_time=1;
if(state->retry_time<1)
state->retry_time=1;
}
else {
@ -215,12 +200,16 @@ void tftp_set_timeouts(tftp_state_data_t *state)
state->retry_max = timeout/15;
}
/* But bound the total number */
if(state->retry_max<3) state->retry_max=3;
if(state->retry_max>50) state->retry_max=50;
if(state->retry_max<3)
state->retry_max=3;
if(state->retry_max>50)
state->retry_max=50;
/* Compute the re-ACK interval to suit the timeout */
state->retry_time = timeout/state->retry_max;
if(state->retry_time<1) state->retry_time=1;
if(state->retry_time<1)
state->retry_time=1;
infof(data, "set timeouts for state %d; Total %d, retry %d maxtry %d\n",
state->state, (state->max_time-state->start_time),
@ -235,6 +224,29 @@ void tftp_set_timeouts(tftp_state_data_t *state)
*
**********************************************************/
static void setpacketevent(tftp_packet_t *packet, unsigned short num)
{
packet->data[0] = (num >> 8);
packet->data[1] = (num & 0xff);
}
static void setpacketblock(tftp_packet_t *packet, unsigned short num)
{
packet->data[2] = (num >> 8);
packet->data[3] = (num & 0xff);
}
static unsigned short getrpacketevent(tftp_packet_t *packet)
{
return (packet->data[0] << 8) | packet->data[1];
}
static unsigned short getrpacketblock(tftp_packet_t *packet)
{
return (packet->data[2] << 8) | packet->data[3];
}
static void tftp_send_first(tftp_state_data_t *state, tftp_event_t event)
{
int sbytes;
@ -260,18 +272,18 @@ static void tftp_send_first(tftp_state_data_t *state, tftp_event_t event)
if(data->set.upload) {
/* If we are uploading, send an WRQ */
state->spacket.event = htons(TFTP_EVENT_WRQ);
setpacketevent(&state->spacket, TFTP_EVENT_WRQ);
filename = curl_easy_unescape(data, filename, 0, NULL);
state->conn->upload_fromhere = (char *)state->spacket.u.data.data;
state->conn->upload_fromhere = (char *)&state->spacket.data[2];
if(data->set.infilesize != -1)
Curl_pgrsSetUploadSize(data, data->set.infilesize);
}
else {
/* If we are downloading, send an RRQ */
state->spacket.event = htons(TFTP_EVENT_RRQ);
setpacketevent(&state->spacket, TFTP_EVENT_RRQ);
}
snprintf((char *)state->spacket.u.request.data,
sizeof(state->spacket.u.request.data),
snprintf((char *)&state->spacket.data[2],
512,
"%s%c%s%c", filename, '\0', mode, '\0');
sbytes = 4 + (int)strlen(filename) + (int)strlen(mode);
sbytes = sendto(state->sockfd, (void *)&state->spacket,
@ -325,7 +337,7 @@ static void tftp_rx(tftp_state_data_t *state, tftp_event_t event)
case TFTP_EVENT_DATA:
/* Is this the block we expect? */
rblock = ntohs(state->rpacket.u.data.block);
rblock = getrpacketblock(&state->rpacket);
if ((state->block+1) != rblock) {
/* No, log it, up the retry count and fail if over the limit */
infof(data,
@ -340,9 +352,9 @@ static void tftp_rx(tftp_state_data_t *state, tftp_event_t event)
/* This is the expected block. Reset counters and ACK it. */
state->block = rblock;
state->retries = 0;
state->spacket.event = htons(TFTP_EVENT_ACK);
state->spacket.u.ack.block = htons(state->block);
sbytes = sendto(state->sockfd, (void *)&state->spacket,
setpacketevent(&state->spacket, TFTP_EVENT_ACK);
setpacketblock(&state->spacket, state->block);
sbytes = sendto(state->sockfd, (void *)state->spacket.data,
4, SEND_4TH_ARG,
(struct sockaddr *)&state->remote_addr,
state->remote_addrlen);
@ -409,7 +421,7 @@ static void tftp_tx(tftp_state_data_t *state, tftp_event_t event)
case TFTP_EVENT_ACK:
/* Ack the packet */
rblock = ntohs(state->rpacket.u.data.block);
rblock = getrpacketblock(&state->rpacket);
if(rblock != state->block) {
/* This isn't the expected block. Log it and up the retry counter */
@ -428,14 +440,14 @@ static void tftp_tx(tftp_state_data_t *state, tftp_event_t event)
block */
state->block++;
state->retries = 0;
state->spacket.event = htons(TFTP_EVENT_DATA);
state->spacket.u.ack.block = htons(state->block);
setpacketevent(&state->spacket, TFTP_EVENT_DATA);
setpacketblock(&state->spacket, state->block);
if(state->block > 1 && state->sbytes < 512) {
state->state = TFTP_STATE_FIN;
return;
}
Curl_fillreadbuffer(state->conn, 512, &state->sbytes);
sbytes = sendto(state->sockfd, (void *)&state->spacket,
sbytes = sendto(state->sockfd, (void *)state->spacket.data,
4+state->sbytes, SEND_4TH_ARG,
(struct sockaddr *)&state->remote_addr,
state->remote_addrlen);
@ -529,28 +541,9 @@ CURLcode Curl_tftp_connect(struct connectdata *conn, bool *done)
tftp_state_data_t *state;
int rc;
/*
* The TFTP code is not portable because it sends C structs directly over
* the wire. Since C gives compiler writers a wide latitude in padding and
* aligning structs, this fails on many architectures (e.g. ARM).
*
* The only portable way to fix this is to copy each struct item into a
* flat buffer and send the flat buffer instead of the struct. The
* alternative, trying to get the compiler to eliminate padding bytes
* within the struct, is a nightmare to maintain (each compiler does it
* differently), and is still not guaranteed to work because some
* architectures can't handle the resulting alignment.
*
* This check can be removed once the code has been fixed.
*/
if(sizeof(struct tftp_packet) != 516) {
failf(conn->data, "tftp not supported on this architecture");
return CURLE_FAILED_INIT;
}
if((state = conn->proto.tftp = calloc(sizeof(tftp_state_data_t), 1))==NULL) {
state = conn->proto.tftp = calloc(sizeof(tftp_state_data_t), 1);
if(!state)
return CURLE_OUT_OF_MEMORY;
}
state->conn = conn;
state->sockfd = state->conn->sock[FIRSTSOCKET];
@ -678,17 +671,17 @@ CURLcode Curl_tftp(struct connectdata *conn, bool *done)
} else {
/* The event is given by the TFTP packet time */
event = (tftp_event_t)ntohs(state->rpacket.event);
event = (tftp_event_t)getrpacketevent(&state->rpacket);
switch(event) {
case TFTP_EVENT_DATA:
if (state->rbytes > 4)
Curl_client_write(data, CLIENTWRITE_BODY,
(char *)state->rpacket.u.data.data, state->rbytes-4);
(char *)&state->rpacket.data[4], state->rbytes-4);
break;
case TFTP_EVENT_ERROR:
state->error = (tftp_error_t)ntohs(state->rpacket.u.error.code);
infof(conn->data, "%s\n", (char *)state->rpacket.u.error.data);
state->error = (tftp_error_t)getrpacketblock(&state->rpacket);
infof(conn->data, "%s\n", (char *)&state->rpacket.data[4]);
break;
case TFTP_EVENT_ACK:
break;