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authorYang Tse <yangsita@gmail.com>2013-01-04 02:50:28 +0100
committerYang Tse <yangsita@gmail.com>2013-01-06 18:20:27 +0100
commit4a5aa6682daeea7cd7cbbb47ce3e1c310e9261c2 (patch)
tree2e85c371bf30d0a1b166b6e30cc54ebef327967b /lib/tftp.c
parente0ba958e2896a1b44f00f00de4981400a47db614 (diff)
downloadcurl-4a5aa6682daeea7cd7cbbb47ce3e1c310e9261c2.tar.gz
Revert changes relative to lib/*.[ch] recent renaming
This reverts renaming and usage of lib/*.h header files done 28-12-2012, reverting 2 commits: f871de0... build: make use of 76 lib/*.h renamed files ffd8e12... build: rename 76 lib/*.h files This also reverts removal of redundant include guard (redundant thanks to changes in above commits) done 2-12-2013, reverting 1 commit: c087374... curl_setup.h: remove redundant include guard This also reverts renaming and usage of lib/*.c source files done 3-12-2013, reverting 3 commits: 13606bb... build: make use of 93 lib/*.c renamed files 5b6e792... build: rename 93 lib/*.c files 7d83dff... build: commit 13606bbfde follow-up 1 Start of related discussion thread: http://curl.haxx.se/mail/lib-2013-01/0012.html Asking for confirmation on pushing this revertion commit: http://curl.haxx.se/mail/lib-2013-01/0048.html Confirmation summary: http://curl.haxx.se/mail/lib-2013-01/0079.html NOTICE: The list of 2 files that have been modified by other intermixed commits, while renamed, and also by at least one of the 6 commits this one reverts follows below. These 2 files will exhibit a hole in history unless git's '--follow' option is used when viewing logs. lib/curl_imap.h lib/curl_smtp.h
Diffstat (limited to 'lib/tftp.c')
-rw-r--r--lib/tftp.c1500
1 files changed, 1500 insertions, 0 deletions
diff --git a/lib/tftp.c b/lib/tftp.c
new file mode 100644
index 000000000..97276ea99
--- /dev/null
+++ b/lib/tftp.c
@@ -0,0 +1,1500 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "setup.h"
+
+#ifndef CURL_DISABLE_TFTP
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#ifdef HAVE_NET_IF_H
+#include <net/if.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#include "urldata.h"
+#include <curl/curl.h>
+#include "transfer.h"
+#include "sendf.h"
+#include "tftp.h"
+#include "progress.h"
+#include "connect.h"
+#include "strerror.h"
+#include "sockaddr.h" /* required for Curl_sockaddr_storage */
+#include "multiif.h"
+#include "url.h"
+#include "rawstr.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+#include "curl_memory.h"
+#include "select.h"
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/* RFC2348 allows the block size to be negotiated */
+#define TFTP_BLKSIZE_DEFAULT 512
+#define TFTP_BLKSIZE_MIN 8
+#define TFTP_BLKSIZE_MAX 65464
+#define TFTP_OPTION_BLKSIZE "blksize"
+
+/* from RFC2349: */
+#define TFTP_OPTION_TSIZE "tsize"
+#define TFTP_OPTION_INTERVAL "timeout"
+
+typedef enum {
+ TFTP_MODE_NETASCII=0,
+ TFTP_MODE_OCTET
+} tftp_mode_t;
+
+typedef enum {
+ TFTP_STATE_START=0,
+ TFTP_STATE_RX,
+ TFTP_STATE_TX,
+ TFTP_STATE_FIN
+} tftp_state_t;
+
+typedef enum {
+ TFTP_EVENT_NONE = -1,
+ TFTP_EVENT_INIT = 0,
+ TFTP_EVENT_RRQ = 1,
+ TFTP_EVENT_WRQ = 2,
+ TFTP_EVENT_DATA = 3,
+ TFTP_EVENT_ACK = 4,
+ TFTP_EVENT_ERROR = 5,
+ TFTP_EVENT_OACK = 6,
+ TFTP_EVENT_TIMEOUT
+} tftp_event_t;
+
+typedef enum {
+ TFTP_ERR_UNDEF=0,
+ TFTP_ERR_NOTFOUND,
+ TFTP_ERR_PERM,
+ TFTP_ERR_DISKFULL,
+ TFTP_ERR_ILLEGAL,
+ TFTP_ERR_UNKNOWNID,
+ TFTP_ERR_EXISTS,
+ TFTP_ERR_NOSUCHUSER, /* This will never be triggered by this code */
+
+ /* The remaining error codes are internal to curl */
+ TFTP_ERR_NONE = -100,
+ TFTP_ERR_TIMEOUT,
+ TFTP_ERR_NORESPONSE
+} tftp_error_t;
+
+typedef struct tftp_packet {
+ unsigned char *data;
+} tftp_packet_t;
+
+typedef struct tftp_state_data {
+ tftp_state_t state;
+ tftp_mode_t mode;
+ tftp_error_t error;
+ tftp_event_t event;
+ struct connectdata *conn;
+ curl_socket_t sockfd;
+ int retries;
+ int retry_time;
+ int retry_max;
+ time_t start_time;
+ time_t max_time;
+ time_t rx_time;
+ unsigned short block;
+ struct Curl_sockaddr_storage local_addr;
+ struct Curl_sockaddr_storage remote_addr;
+ curl_socklen_t remote_addrlen;
+ int rbytes;
+ int sbytes;
+ int blksize;
+ int requested_blksize;
+ tftp_packet_t rpacket;
+ tftp_packet_t spacket;
+} tftp_state_data_t;
+
+
+/* Forward declarations */
+static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event) ;
+static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event) ;
+static CURLcode tftp_connect(struct connectdata *conn, bool *done);
+static CURLcode tftp_disconnect(struct connectdata *conn,
+ bool dead_connection);
+static CURLcode tftp_do(struct connectdata *conn, bool *done);
+static CURLcode tftp_done(struct connectdata *conn,
+ CURLcode, bool premature);
+static CURLcode tftp_setup_connection(struct connectdata * conn);
+static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done);
+static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done);
+static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks,
+ int numsocks);
+static CURLcode tftp_translate_code(tftp_error_t error);
+
+
+/*
+ * TFTP protocol handler.
+ */
+
+const struct Curl_handler Curl_handler_tftp = {
+ "TFTP", /* scheme */
+ tftp_setup_connection, /* setup_connection */
+ tftp_do, /* do_it */
+ tftp_done, /* done */
+ ZERO_NULL, /* do_more */
+ tftp_connect, /* connect_it */
+ tftp_multi_statemach, /* connecting */
+ tftp_doing, /* doing */
+ tftp_getsock, /* proto_getsock */
+ tftp_getsock, /* doing_getsock */
+ ZERO_NULL, /* domore_getsock */
+ ZERO_NULL, /* perform_getsock */
+ tftp_disconnect, /* disconnect */
+ ZERO_NULL, /* readwrite */
+ PORT_TFTP, /* defport */
+ CURLPROTO_TFTP, /* protocol */
+ PROTOPT_NONE | PROTOPT_NOURLQUERY /* flags */
+};
+
+/**********************************************************
+ *
+ * tftp_set_timeouts -
+ *
+ * Set timeouts based on state machine state.
+ * Use user provided connect timeouts until DATA or ACK
+ * packet is received, then use user-provided transfer timeouts
+ *
+ *
+ **********************************************************/
+static CURLcode tftp_set_timeouts(tftp_state_data_t *state)
+{
+ time_t maxtime, timeout;
+ long timeout_ms;
+ bool start = (state->state == TFTP_STATE_START) ? TRUE : FALSE;
+
+ time(&state->start_time);
+
+ /* Compute drop-dead time */
+ timeout_ms = Curl_timeleft(state->conn->data, NULL, start);
+
+ if(timeout_ms < 0) {
+ /* time-out, bail out, go home */
+ failf(state->conn->data, "Connection time-out");
+ return CURLE_OPERATION_TIMEDOUT;
+ }
+
+ if(start) {
+
+ maxtime = (time_t)(timeout_ms + 500) / 1000;
+ state->max_time = state->start_time+maxtime;
+
+ /* Set per-block timeout to total */
+ timeout = maxtime ;
+
+ /* Average restart after 5 seconds */
+ state->retry_max = (int)timeout/5;
+
+ if(state->retry_max < 1)
+ /* avoid division by zero below */
+ state->retry_max = 1;
+
+ /* Compute the re-start interval to suit the timeout */
+ state->retry_time = (int)timeout/state->retry_max;
+ if(state->retry_time<1)
+ state->retry_time=1;
+
+ }
+ else {
+ if(timeout_ms > 0)
+ maxtime = (time_t)(timeout_ms + 500) / 1000;
+ else
+ maxtime = 3600;
+
+ state->max_time = state->start_time+maxtime;
+
+ /* Set per-block timeout to total */
+ timeout = maxtime;
+
+ /* Average reposting an ACK after 5 seconds */
+ state->retry_max = (int)timeout/5;
+ }
+ /* But bound the total number */
+ 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 = (int)(timeout/state->retry_max);
+ if(state->retry_time<1)
+ state->retry_time=1;
+
+ infof(state->conn->data,
+ "set timeouts for state %d; Total %ld, retry %d maxtry %d\n",
+ (int)state->state, (long)(state->max_time-state->start_time),
+ state->retry_time, state->retry_max);
+
+ /* init RX time */
+ time(&state->rx_time);
+
+ return CURLE_OK;
+}
+
+/**********************************************************
+ *
+ * tftp_set_send_first
+ *
+ * Event handler for the START state
+ *
+ **********************************************************/
+
+static void setpacketevent(tftp_packet_t *packet, unsigned short num)
+{
+ packet->data[0] = (unsigned char)(num >> 8);
+ packet->data[1] = (unsigned char)(num & 0xff);
+}
+
+
+static void setpacketblock(tftp_packet_t *packet, unsigned short num)
+{
+ packet->data[2] = (unsigned char)(num >> 8);
+ packet->data[3] = (unsigned char)(num & 0xff);
+}
+
+static unsigned short getrpacketevent(const tftp_packet_t *packet)
+{
+ return (unsigned short)((packet->data[0] << 8) | packet->data[1]);
+}
+
+static unsigned short getrpacketblock(const tftp_packet_t *packet)
+{
+ return (unsigned short)((packet->data[2] << 8) | packet->data[3]);
+}
+
+static size_t Curl_strnlen(const char *string, size_t maxlen)
+{
+ const char *end = memchr (string, '\0', maxlen);
+ return end ? (size_t) (end - string) : maxlen;
+}
+
+static const char *tftp_option_get(const char *buf, size_t len,
+ const char **option, const char **value)
+{
+ size_t loc;
+
+ loc = Curl_strnlen( buf, len );
+ loc++; /* NULL term */
+
+ if(loc >= len)
+ return NULL;
+ *option = buf;
+
+ loc += Curl_strnlen( buf+loc, len-loc );
+ loc++; /* NULL term */
+
+ if(loc > len)
+ return NULL;
+ *value = &buf[strlen(*option) + 1];
+
+ return &buf[loc];
+}
+
+static CURLcode tftp_parse_option_ack(tftp_state_data_t *state,
+ const char *ptr, int len)
+{
+ const char *tmp = ptr;
+ struct SessionHandle *data = state->conn->data;
+
+ /* if OACK doesn't contain blksize option, the default (512) must be used */
+ state->blksize = TFTP_BLKSIZE_DEFAULT;
+
+ while(tmp < ptr + len) {
+ const char *option, *value;
+
+ tmp = tftp_option_get(tmp, ptr + len - tmp, &option, &value);
+ if(tmp == NULL) {
+ failf(data, "Malformed ACK packet, rejecting");
+ return CURLE_TFTP_ILLEGAL;
+ }
+
+ infof(data, "got option=(%s) value=(%s)\n", option, value);
+
+ if(checkprefix(option, TFTP_OPTION_BLKSIZE)) {
+ long blksize;
+
+ blksize = strtol( value, NULL, 10 );
+
+ if(!blksize) {
+ failf(data, "invalid blocksize value in OACK packet");
+ return CURLE_TFTP_ILLEGAL;
+ }
+ else if(blksize > TFTP_BLKSIZE_MAX) {
+ failf(data, "%s (%d)", "blksize is larger than max supported",
+ TFTP_BLKSIZE_MAX);
+ return CURLE_TFTP_ILLEGAL;
+ }
+ else if(blksize < TFTP_BLKSIZE_MIN) {
+ failf(data, "%s (%d)", "blksize is smaller than min supported",
+ TFTP_BLKSIZE_MIN);
+ return CURLE_TFTP_ILLEGAL;
+ }
+ else if(blksize > state->requested_blksize) {
+ /* could realloc pkt buffers here, but the spec doesn't call out
+ * support for the server requesting a bigger blksize than the client
+ * requests */
+ failf(data, "%s (%ld)",
+ "server requested blksize larger than allocated", blksize);
+ return CURLE_TFTP_ILLEGAL;
+ }
+
+ state->blksize = (int)blksize;
+ infof(data, "%s (%d) %s (%d)\n", "blksize parsed from OACK",
+ state->blksize, "requested", state->requested_blksize);
+ }
+ else if(checkprefix(option, TFTP_OPTION_TSIZE)) {
+ long tsize = 0;
+
+ tsize = strtol( value, NULL, 10 );
+ infof(data, "%s (%ld)\n", "tsize parsed from OACK", tsize);
+
+ /* tsize should be ignored on upload: Who cares about the size of the
+ remote file? */
+ if(!data->set.upload) {
+ if(!tsize) {
+ failf(data, "invalid tsize -:%s:- value in OACK packet", value);
+ return CURLE_TFTP_ILLEGAL;
+ }
+ Curl_pgrsSetDownloadSize(data, tsize);
+ }
+ }
+ }
+
+ return CURLE_OK;
+}
+
+static size_t tftp_option_add(tftp_state_data_t *state, size_t csize,
+ char *buf, const char *option)
+{
+ if(( strlen(option) + csize + 1 ) > (size_t)state->blksize)
+ return 0;
+ strcpy(buf, option);
+ return( strlen(option) + 1 );
+}
+
+static CURLcode tftp_connect_for_tx(tftp_state_data_t *state,
+ tftp_event_t event)
+{
+ CURLcode res;
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
+ struct SessionHandle *data = state->conn->data;
+
+ infof(data, "%s\n", "Connected for transmit");
+#endif
+ state->state = TFTP_STATE_TX;
+ res = tftp_set_timeouts(state);
+ if(res != CURLE_OK)
+ return(res);
+ return tftp_tx(state, event);
+}
+
+static CURLcode tftp_connect_for_rx(tftp_state_data_t *state,
+ tftp_event_t event)
+{
+ CURLcode res;
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
+ struct SessionHandle *data = state->conn->data;
+
+ infof(data, "%s\n", "Connected for receive");
+#endif
+ state->state = TFTP_STATE_RX;
+ res = tftp_set_timeouts(state);
+ if(res != CURLE_OK)
+ return(res);
+ return tftp_rx(state, event);
+}
+
+static CURLcode tftp_send_first(tftp_state_data_t *state, tftp_event_t event)
+{
+ size_t sbytes;
+ ssize_t senddata;
+ const char *mode = "octet";
+ char *filename;
+ char buf[64];
+ struct SessionHandle *data = state->conn->data;
+ CURLcode res = CURLE_OK;
+
+ /* Set ascii mode if -B flag was used */
+ if(data->set.prefer_ascii)
+ mode = "netascii";
+
+ switch(event) {
+
+ case TFTP_EVENT_INIT: /* Send the first packet out */
+ case TFTP_EVENT_TIMEOUT: /* Resend the first packet out */
+ /* Increment the retry counter, quit if over the limit */
+ state->retries++;
+ if(state->retries>state->retry_max) {
+ state->error = TFTP_ERR_NORESPONSE;
+ state->state = TFTP_STATE_FIN;
+ return res;
+ }
+
+ if(data->set.upload) {
+ /* If we are uploading, send an WRQ */
+ setpacketevent(&state->spacket, TFTP_EVENT_WRQ);
+ state->conn->data->req.upload_fromhere =
+ (char *)state->spacket.data+4;
+ if(data->set.infilesize != -1)
+ Curl_pgrsSetUploadSize(data, data->set.infilesize);
+ }
+ else {
+ /* If we are downloading, send an RRQ */
+ setpacketevent(&state->spacket, TFTP_EVENT_RRQ);
+ }
+ /* As RFC3617 describes the separator slash is not actually part of the
+ file name so we skip the always-present first letter of the path
+ string. */
+ filename = curl_easy_unescape(data, &state->conn->data->state.path[1], 0,
+ NULL);
+ if(!filename)
+ return CURLE_OUT_OF_MEMORY;
+
+ snprintf((char *)state->spacket.data+2,
+ state->blksize,
+ "%s%c%s%c", filename, '\0', mode, '\0');
+ sbytes = 4 + strlen(filename) + strlen(mode);
+
+ /* add tsize option */
+ if(data->set.upload && (data->set.infilesize != -1))
+ snprintf( buf, sizeof(buf), "%" FORMAT_OFF_T, data->set.infilesize );
+ else
+ strcpy(buf, "0"); /* the destination is large enough */
+
+ sbytes += tftp_option_add(state, sbytes,
+ (char *)state->spacket.data+sbytes,
+ TFTP_OPTION_TSIZE);
+ sbytes += tftp_option_add(state, sbytes,
+ (char *)state->spacket.data+sbytes, buf);
+ /* add blksize option */
+ snprintf( buf, sizeof(buf), "%d", state->requested_blksize );
+ sbytes += tftp_option_add(state, sbytes,
+ (char *)state->spacket.data+sbytes,
+ TFTP_OPTION_BLKSIZE);
+ sbytes += tftp_option_add(state, sbytes,
+ (char *)state->spacket.data+sbytes, buf );
+
+ /* add timeout option */
+ snprintf( buf, sizeof(buf), "%d", state->retry_time);
+ sbytes += tftp_option_add(state, sbytes,
+ (char *)state->spacket.data+sbytes,
+ TFTP_OPTION_INTERVAL);
+ sbytes += tftp_option_add(state, sbytes,
+ (char *)state->spacket.data+sbytes, buf );
+
+ /* the typecase for the 3rd argument is mostly for systems that do
+ not have a size_t argument, like older unixes that want an 'int' */
+ senddata = sendto(state->sockfd, (void *)state->spacket.data,
+ (SEND_TYPE_ARG3)sbytes, 0,
+ state->conn->ip_addr->ai_addr,
+ state->conn->ip_addr->ai_addrlen);
+ if(senddata != (ssize_t)sbytes) {
+ failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
+ }
+ Curl_safefree(filename);
+ break;
+
+ case TFTP_EVENT_OACK:
+ if(data->set.upload) {
+ res = tftp_connect_for_tx(state, event);
+ }
+ else {
+ res = tftp_connect_for_rx(state, event);
+ }
+ break;
+
+ case TFTP_EVENT_ACK: /* Connected for transmit */
+ res = tftp_connect_for_tx(state, event);
+ break;
+
+ case TFTP_EVENT_DATA: /* Connected for receive */
+ res = tftp_connect_for_rx(state, event);
+ break;
+
+ case TFTP_EVENT_ERROR:
+ state->state = TFTP_STATE_FIN;
+ break;
+
+ default:
+ failf(state->conn->data, "tftp_send_first: internal error");
+ break;
+ }
+ return res;
+}
+
+/* the next blocknum is x + 1 but it needs to wrap at an unsigned 16bit
+ boundary */
+#define NEXT_BLOCKNUM(x) (((x)+1)&0xffff)
+
+/**********************************************************
+ *
+ * tftp_rx
+ *
+ * Event handler for the RX state
+ *
+ **********************************************************/
+static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event)
+{
+ ssize_t sbytes;
+ int rblock;
+ struct SessionHandle *data = state->conn->data;
+
+ switch(event) {
+
+ case TFTP_EVENT_DATA:
+ /* Is this the block we expect? */
+ rblock = getrpacketblock(&state->rpacket);
+ if(NEXT_BLOCKNUM(state->block) == rblock) {
+ /* This is the expected block. Reset counters and ACK it. */
+ state->retries = 0;
+ }
+ else if(state->block == rblock) {
+ /* This is the last recently received block again. Log it and ACK it
+ again. */
+ infof(data, "Received last DATA packet block %d again.\n", rblock);
+ }
+ else {
+ /* totally unexpected, just log it */
+ infof(data,
+ "Received unexpected DATA packet block %d, expecting block %d\n",
+ rblock, NEXT_BLOCKNUM(state->block));
+ break;
+ }
+
+ /* ACK this block. */
+ state->block = (unsigned short)rblock;
+ 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);
+ if(sbytes < 0) {
+ failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
+ return CURLE_SEND_ERROR;
+ }
+
+ /* Check if completed (That is, a less than full packet is received) */
+ if(state->rbytes < (ssize_t)state->blksize+4) {
+ state->state = TFTP_STATE_FIN;
+ }
+ else {
+ state->state = TFTP_STATE_RX;
+ }
+ time(&state->rx_time);
+ break;
+
+ case TFTP_EVENT_OACK:
+ /* ACK option acknowledgement so we can move on to data */
+ state->block = 0;
+ state->retries = 0;
+ 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);
+ if(sbytes < 0) {
+ failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
+ return CURLE_SEND_ERROR;
+ }
+
+ /* we're ready to RX data */
+ state->state = TFTP_STATE_RX;
+ time(&state->rx_time);
+ break;
+
+ case TFTP_EVENT_TIMEOUT:
+ /* Increment the retry count and fail if over the limit */
+ state->retries++;
+ infof(data,
+ "Timeout waiting for block %d ACK. Retries = %d\n",
+ NEXT_BLOCKNUM(state->block), state->retries);
+ if(state->retries > state->retry_max) {
+ state->error = TFTP_ERR_TIMEOUT;
+ state->state = TFTP_STATE_FIN;
+ }
+ else {
+ /* Resend the previous ACK */
+ sbytes = sendto(state->sockfd, (void *)state->spacket.data,
+ 4, SEND_4TH_ARG,
+ (struct sockaddr *)&state->remote_addr,
+ state->remote_addrlen);
+ if(sbytes<0) {
+ failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
+ return CURLE_SEND_ERROR;
+ }
+ }
+ break;
+
+ case TFTP_EVENT_ERROR:
+ setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
+ setpacketblock(&state->spacket, state->block);
+ (void)sendto(state->sockfd, (void *)state->spacket.data,
+ 4, SEND_4TH_ARG,
+ (struct sockaddr *)&state->remote_addr,
+ state->remote_addrlen);
+ /* don't bother with the return code, but if the socket is still up we
+ * should be a good TFTP client and let the server know we're done */
+ state->state = TFTP_STATE_FIN;
+ break;
+
+ default:
+ failf(data, "%s", "tftp_rx: internal error");
+ return CURLE_TFTP_ILLEGAL; /* not really the perfect return code for
+ this */
+ }
+ return CURLE_OK;
+}
+
+/**********************************************************
+ *
+ * tftp_tx
+ *
+ * Event handler for the TX state
+ *
+ **********************************************************/
+static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event)
+{
+ struct SessionHandle *data = state->conn->data;
+ ssize_t sbytes;
+ int rblock;
+ CURLcode res = CURLE_OK;
+ struct SingleRequest *k = &data->req;
+
+ switch(event) {
+
+ case TFTP_EVENT_ACK:
+ case TFTP_EVENT_OACK:
+ if(event == TFTP_EVENT_ACK) {
+ /* Ack the packet */
+ rblock = getrpacketblock(&state->rpacket);
+
+ if(rblock != state->block &&
+ /* There's a bug in tftpd-hpa that causes it to send us an ack for
+ * 65535 when the block number wraps to 0. So when we're expecting
+ * 0, also accept 65535. See
+ * http://syslinux.zytor.com/archives/2010-September/015253.html
+ * */
+ !(state->block == 0 && rblock == 65535)) {
+ /* This isn't the expected block. Log it and up the retry counter */
+ infof(data, "Received ACK for block %d, expecting %d\n",
+ rblock, state->block);
+ state->retries++;
+ /* Bail out if over the maximum */
+ if(state->retries>state->retry_max) {
+ failf(data, "tftp_tx: giving up waiting for block %d ack",
+ state->block);
+ res = CURLE_SEND_ERROR;
+ }
+ else {
+ /* Re-send the data packet */
+ sbytes = sendto(state->sockfd, (void *)state->spacket.data,
+ 4+state->sbytes, SEND_4TH_ARG,
+ (struct sockaddr *)&state->remote_addr,
+ state->remote_addrlen);
+ /* Check all sbytes were sent */
+ if(sbytes<0) {
+ failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
+ res = CURLE_SEND_ERROR;
+ }
+ }
+ return res;
+ }
+ /* This is the expected packet. Reset the counters and send the next
+ block */
+ time(&state->rx_time);
+ state->block++;
+ }
+ else
+ state->block = 1; /* first data block is 1 when using OACK */
+
+ state->retries = 0;
+ setpacketevent(&state->spacket, TFTP_EVENT_DATA);
+ setpacketblock(&state->spacket, state->block);
+ if(state->block > 1 && state->sbytes < (int)state->blksize) {
+ state->state = TFTP_STATE_FIN;
+ return CURLE_OK;
+ }
+ res = Curl_fillreadbuffer(state->conn, state->blksize, &state->sbytes);
+ if(res)
+ return res;
+ sbytes = sendto(state->sockfd, (void *)state->spacket.data,
+ 4+state->sbytes, SEND_4TH_ARG,
+ (struct sockaddr *)&state->remote_addr,
+ state->remote_addrlen);
+ /* Check all sbytes were sent */
+ if(sbytes<0) {
+ failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
+ return CURLE_SEND_ERROR;
+ }
+ /* Update the progress meter */
+ k->writebytecount += state->sbytes;
+ Curl_pgrsSetUploadCounter(data, k->writebytecount);
+ break;
+
+ case TFTP_EVENT_TIMEOUT:
+ /* Increment the retry counter and log the timeout */
+ state->retries++;
+ infof(data, "Timeout waiting for block %d ACK. "
+ " Retries = %d\n", NEXT_BLOCKNUM(state->block), state->retries);
+ /* Decide if we've had enough */
+ if(state->retries > state->retry_max) {
+ state->error = TFTP_ERR_TIMEOUT;
+ state->state = TFTP_STATE_FIN;
+ }
+ else {
+ /* Re-send the data packet */
+ sbytes = sendto(state->sockfd, (void *)state->spacket.data,
+ 4+state->sbytes, SEND_4TH_ARG,
+ (struct sockaddr *)&state->remote_addr,
+ state->remote_addrlen);
+ /* Check all sbytes were sent */
+ if(sbytes<0) {
+ failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
+ return CURLE_SEND_ERROR;
+ }
+ /* since this was a re-send, we remain at the still byte position */
+ Curl_pgrsSetUploadCounter(data, k->writebytecount);
+ }
+ break;
+
+ case TFTP_EVENT_ERROR:
+ state->state = TFTP_STATE_FIN;
+ setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
+ setpacketblock(&state->spacket, state->block);
+ (void)sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG,
+ (struct sockaddr *)&state->remote_addr,
+ state->remote_addrlen);
+ /* don't bother with the return code, but if the socket is still up we
+ * should be a good TFTP client and let the server know we're done */
+ state->state = TFTP_STATE_FIN;
+ break;
+
+ default:
+ failf(data, "tftp_tx: internal error, event: %i", (int)(event));
+ break;
+ }
+
+ return res;
+}
+
+/**********************************************************
+ *
+ * tftp_translate_code
+ *
+ * Translate internal error codes to CURL error codes
+ *
+ **********************************************************/
+static CURLcode tftp_translate_code(tftp_error_t error)
+{
+ CURLcode code = CURLE_OK;
+
+ if(error != TFTP_ERR_NONE) {
+ switch(error) {
+ case TFTP_ERR_NOTFOUND:
+ code = CURLE_TFTP_NOTFOUND;
+ break;
+ case TFTP_ERR_PERM:
+ code = CURLE_TFTP_PERM;
+ break;
+ case TFTP_ERR_DISKFULL:
+ code = CURLE_REMOTE_DISK_FULL;
+ break;
+ case TFTP_ERR_UNDEF:
+ case TFTP_ERR_ILLEGAL:
+ code = CURLE_TFTP_ILLEGAL;
+ break;
+ case TFTP_ERR_UNKNOWNID:
+ code = CURLE_TFTP_UNKNOWNID;
+ break;
+ case TFTP_ERR_EXISTS:
+ code = CURLE_REMOTE_FILE_EXISTS;
+ break;
+ case TFTP_ERR_NOSUCHUSER:
+ code = CURLE_TFTP_NOSUCHUSER;
+ break;
+ case TFTP_ERR_TIMEOUT:
+ code = CURLE_OPERATION_TIMEDOUT;
+ break;
+ case TFTP_ERR_NORESPONSE:
+ code = CURLE_COULDNT_CONNECT;
+ break;
+ default:
+ code= CURLE_ABORTED_BY_CALLBACK;
+ break;
+ }
+ }
+ else {
+ code = CURLE_OK;
+ }
+
+ return(code);
+}
+
+/**********************************************************
+ *
+ * tftp_state_machine
+ *
+ * The tftp state machine event dispatcher
+ *
+ **********************************************************/
+static CURLcode tftp_state_machine(tftp_state_data_t *state,
+ tftp_event_t event)
+{
+ CURLcode res = CURLE_OK;
+ struct SessionHandle *data = state->conn->data;
+ switch(state->state) {
+ case TFTP_STATE_START:
+ DEBUGF(infof(data, "TFTP_STATE_START\n"));
+ res = tftp_send_first(state, event);
+ break;
+ case TFTP_STATE_RX:
+ DEBUGF(infof(data, "TFTP_STATE_RX\n"));
+ res = tftp_rx(state, event);
+ break;
+ case TFTP_STATE_TX:
+ DEBUGF(infof(data, "TFTP_STATE_TX\n"));
+ res = tftp_tx(state, event);
+ break;
+ case TFTP_STATE_FIN:
+ infof(data, "%s\n", "TFTP finished");
+ break;
+ default:
+ DEBUGF(infof(data, "STATE: %d\n", state->state));
+ failf(data, "%s", "Internal state machine error");
+ res = CURLE_TFTP_ILLEGAL;
+ break;
+ }
+ return res;
+}
+
+/**********************************************************
+ *
+ * tftp_disconnect
+ *
+ * The disconnect callback
+ *
+ **********************************************************/
+static CURLcode tftp_disconnect(struct connectdata *conn, bool dead_connection)
+{
+ tftp_state_data_t *state = conn->proto.tftpc;
+ (void) dead_connection;
+
+ /* done, free dynamically allocated pkt buffers */
+ if(state) {
+ Curl_safefree(state->rpacket.data);
+ Curl_safefree(state->spacket.data);
+ free(state);
+ }
+
+ return CURLE_OK;
+}
+
+/**********************************************************
+ *
+ * tftp_connect
+ *
+ * The connect callback
+ *
+ **********************************************************/
+static CURLcode tftp_connect(struct connectdata *conn, bool *done)
+{
+ CURLcode code;
+ tftp_state_data_t *state;
+ int blksize, rc;
+
+ blksize = TFTP_BLKSIZE_DEFAULT;
+
+ /* If there already is a protocol-specific struct allocated for this
+ sessionhandle, deal with it */
+ Curl_reset_reqproto(conn);
+
+ state = conn->proto.tftpc = calloc(1, sizeof(tftp_state_data_t));
+ if(!state)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* alloc pkt buffers based on specified blksize */
+ if(conn->data->set.tftp_blksize) {
+ blksize = (int)conn->data->set.tftp_blksize;
+ if(blksize > TFTP_BLKSIZE_MAX || blksize < TFTP_BLKSIZE_MIN )
+ return CURLE_TFTP_ILLEGAL;
+ }
+
+ if(!state->rpacket.data) {
+ state->rpacket.data = calloc(1, blksize + 2 + 2);
+
+ if(!state->rpacket.data)
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ if(!state->spacket.data) {
+ state->spacket.data = calloc(1, blksize + 2 + 2);
+
+ if(!state->spacket.data)
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ conn->bits.close = TRUE; /* we don't keep TFTP connections up bascially
+ because there's none or very little gain for UDP
+ */
+
+ state->conn = conn;
+ state->sockfd = state->conn->sock[FIRSTSOCKET];
+ state->state = TFTP_STATE_START;
+ state->error = TFTP_ERR_NONE;
+ state->blksize = TFTP_BLKSIZE_DEFAULT;
+ state->requested_blksize = blksize;
+
+ ((struct sockaddr *)&state->local_addr)->sa_family =
+ (unsigned short)(conn->ip_addr->ai_family);
+
+ tftp_set_timeouts(state);
+
+ if(!conn->bits.bound) {
+ /* If not already bound, bind to any interface, random UDP port. If it is
+ * reused or a custom local port was desired, this has already been done!
+ *
+ * We once used the size of the local_addr struct as the third argument
+ * for bind() to better work with IPv6 or whatever size the struct could
+ * have, but we learned that at least Tru64, AIX and IRIX *requires* the
+ * size of that argument to match the exact size of a 'sockaddr_in' struct
+ * when running IPv4-only.
+ *
+ * Therefore we use the size from the address we connected to, which we
+ * assume uses the same IP version and thus hopefully this works for both
+ * IPv4 and IPv6...
+ */
+ rc = bind(state->sockfd, (struct sockaddr *)&state->local_addr,
+ conn->ip_addr->ai_addrlen);
+ if(rc) {
+ failf(conn->data, "bind() failed; %s",
+ Curl_strerror(conn, SOCKERRNO));
+ return CURLE_COULDNT_CONNECT;
+ }
+ conn->bits.bound = TRUE;
+ }
+
+ Curl_pgrsStartNow(conn->data);
+
+ *done = TRUE;
+ code = CURLE_OK;
+ return(code);
+}
+
+/**********************************************************
+ *
+ * tftp_done
+ *
+ * The done callback
+ *
+ **********************************************************/
+static CURLcode tftp_done(struct connectdata *conn, CURLcode status,
+ bool premature)
+{
+ CURLcode code = CURLE_OK;
+ tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
+
+ (void)status; /* unused */
+ (void)premature; /* not used */
+
+ if(Curl_pgrsDone(conn))
+ return CURLE_ABORTED_BY_CALLBACK;
+
+ /* If we have encountered an error */
+ code = tftp_translate_code(state->error);
+
+ return code;
+}
+
+/**********************************************************
+ *
+ * tftp_getsock
+ *
+ * The getsock callback
+ *
+ **********************************************************/
+static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks,
+ int numsocks)
+{
+ if(!numsocks)
+ return GETSOCK_BLANK;
+
+ socks[0] = conn->sock[FIRSTSOCKET];
+
+ return GETSOCK_READSOCK(0);
+}
+
+/**********************************************************
+ *
+ * tftp_receive_packet
+ *
+ * Called once select fires and data is ready on the socket
+ *
+ **********************************************************/
+static CURLcode tftp_receive_packet(struct connectdata *conn)
+{
+ struct Curl_sockaddr_storage fromaddr;
+ curl_socklen_t fromlen;
+ CURLcode result = CURLE_OK;
+ struct SessionHandle *data = conn->data;
+ tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
+ struct SingleRequest *k = &data->req;
+
+ /* Receive the packet */
+ fromlen = sizeof(fromaddr);
+ state->rbytes = (int)recvfrom(state->sockfd,
+ (void *)state->rpacket.data,
+ state->blksize+4,
+ 0,
+ (struct sockaddr *)&fromaddr,
+ &fromlen);
+ if(state->remote_addrlen==0) {
+ memcpy(&state->remote_addr, &fromaddr, fromlen);
+ state->remote_addrlen = fromlen;
+ }
+
+ /* Sanity check packet length */
+ if(state->rbytes < 4) {
+ failf(data, "Received too short packet");
+ /* Not a timeout, but how best to handle it? */
+ state->event = TFTP_EVENT_TIMEOUT;
+ }
+ else {
+ /* The event is given by the TFTP packet time */
+ state->event = (tftp_event_t)getrpacketevent(&state->rpacket);
+
+ switch(state->event) {
+ case TFTP_EVENT_DATA:
+ /* Don't pass to the client empty or retransmitted packets */
+ if(state->rbytes > 4 &&
+ (NEXT_BLOCKNUM(state->block) == getrpacketblock(&state->rpacket))) {
+ result = Curl_client_write(conn, CLIENTWRITE_BODY,
+ (char *)state->rpacket.data+4,
+ state->rbytes-4);
+ if(result) {
+ tftp_state_machine(state, TFTP_EVENT_ERROR);
+ return result;
+ }
+ k->bytecount += state->rbytes-4;
+ Curl_pgrsSetDownloadCounter(data, (curl_off_t) k->bytecount);
+ }
+ break;
+ case TFTP_EVENT_ERROR:
+ state->error = (tftp_error_t)getrpacketblock(&state->rpacket);
+ infof(data, "%s\n", (const char *)state->rpacket.data+4);
+ break;
+ case TFTP_EVENT_ACK:
+ break;
+ case TFTP_EVENT_OACK:
+ result = tftp_parse_option_ack(state,
+ (const char *)state->rpacket.data+2,
+ state->rbytes-2);
+ if(result)
+ return result;
+ break;
+ case TFTP_EVENT_RRQ:
+ case TFTP_EVENT_WRQ:
+ default:
+ failf(data, "%s", "Internal error: Unexpected packet");
+ break;
+ }
+
+ /* Update the progress meter */
+ if(Curl_pgrsUpdate(conn)) {
+ tftp_state_machine(state, TFTP_EVENT_ERROR);
+ return CURLE_ABORTED_BY_CALLBACK;
+ }
+ }
+ return result;
+}
+
+/**********************************************************
+ *
+ * tftp_state_timeout
+ *
+ * Check if timeouts have been reached
+ *
+ **********************************************************/
+static long tftp_state_timeout(struct connectdata *conn, tftp_event_t *event)
+{
+ time_t current;
+ tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
+
+ if(event)
+ *event = TFTP_EVENT_NONE;
+
+ time(&current);
+ if(current > state->max_time) {
+ DEBUGF(infof(conn->data, "timeout: %ld > %ld\n",
+ (long)current, (long)state->max_time));
+ state->error = TFTP_ERR_TIMEOUT;
+ state->state = TFTP_STATE_FIN;
+ return 0;
+ }
+ else if(current > state->rx_time+state->retry_time) {
+ if(event)
+ *event = TFTP_EVENT_TIMEOUT;
+ time(&state->rx_time); /* update even though we received nothing */
+ }
+
+ /* there's a typecast below here since 'time_t' may in fact be larger than
+ 'long', but we estimate that a 'long' will still be able to hold number
+ of seconds even if "only" 32 bit */
+ return (long)(state->max_time - current);
+}
+
+
+/**********************************************************
+ *
+ * tftp_easy_statemach
+ *
+ * Handle easy request until completion
+ *
+ **********************************************************/
+static CURLcode tftp_easy_statemach(struct connectdata *conn)
+{
+ int rc;
+ int check_time = 0;
+ CURLcode result = CURLE_OK;
+ struct SessionHandle *data = conn->data;
+ tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
+ curl_socket_t fd_read;
+ long timeout_ms;
+ struct SingleRequest *k = &data->req;
+ struct timeval transaction_start = Curl_tvnow();
+
+ k->start = transaction_start;
+ k->now = transaction_start;
+
+ /* Run the TFTP State Machine */
+ for(; (state->state != TFTP_STATE_FIN) && (result == CURLE_OK); ) {
+
+ timeout_ms = state->retry_time * 1000;
+
+ if(data->set.upload) {
+ if(data->set.max_send_speed &&
+ (data->progress.ulspeed > data->set.max_send_speed)) {
+ fd_read = CURL_SOCKET_BAD;
+ timeout_ms = Curl_sleep_time(data->set.max_send_speed,
+ data->progress.ulspeed, state->blksize);
+ }
+ else {
+ fd_read = state->sockfd;
+ }
+ }
+ else {
+ if(data->set.max_recv_speed &&
+ (data->progress.dlspeed > data->set.max_recv_speed)) {
+ fd_read = CURL_SOCKET_BAD;
+ timeout_ms = Curl_sleep_time(data->set.max_recv_speed,
+ data->progress.dlspeed, state->blksize);
+ }
+ else
+ fd_read = state->sockfd;
+ }
+
+ if(data->set.timeout) {
+ timeout_ms = data->set.timeout - Curl_tvdiff(k->now, k->start);
+ if(timeout_ms > state->retry_time * 1000)
+ timeout_ms = state->retry_time * 1000;
+ else if(timeout_ms < 0)
+ timeout_ms = 0;
+ }
+
+
+ /* Wait until ready to read or timeout occurs */
+ rc = Curl_socket_ready(fd_read, CURL_SOCKET_BAD, timeout_ms);
+
+ k->now = Curl_tvnow();
+
+ /* Force a progress callback if it's been too long */
+ if(Curl_tvdiff(k->now, k->start) >= data->set.timeout) {
+ if(Curl_pgrsUpdate(conn)) {
+ tftp_state_machine(state, TFTP_EVENT_ERROR);
+ return CURLE_ABORTED_BY_CALLBACK;
+ }
+ k->start = k->now;
+ }
+
+ if(rc == -1) {
+ /* bail out */
+ int error = SOCKERRNO;
+ failf(data, "%s", Curl_strerror(conn, error));
+ state->event = TFTP_EVENT_ERROR;
+ }
+ else {
+
+ if(rc==0) {
+ /* A timeout occurred, but our timeout is variable, so maybe
+ just continue? */
+ long rtms = state->retry_time * 1000;
+ if(Curl_tvdiff(k->now, transaction_start) > rtms) {
+ state->event = TFTP_EVENT_TIMEOUT;
+ /* Force a look at transfer timeouts */
+ check_time = 1;
+ }
+ else {
+ continue; /* skip state machine */
+ }
+ }
+ else {
+ result = tftp_receive_packet(conn);
+ if(result == CURLE_OK)
+ transaction_start = Curl_tvnow();
+
+ if(k->bytecountp)
+ *k->bytecountp = k->bytecount; /* read count */
+ if(k->writebytecountp)
+ *k->writebytecountp = k->writebytecount; /* write count */
+ }
+ }
+
+ if(check_time) {
+ tftp_state_timeout(conn, NULL);
+ check_time = 0;
+ }
+
+ if(result)
+ return(result);
+
+ result = tftp_state_machine(state, state->event);
+ }
+
+ /* Tell curl we're done */
+ Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
+
+ return(result);
+}
+
+/**********************************************************
+ *
+ * tftp_multi_statemach
+ *
+ * Handle single RX socket event and return
+ *
+ **********************************************************/
+static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done)
+{
+ int rc;
+ tftp_event_t event;
+ CURLcode result = CURLE_OK;
+ struct SessionHandle *data = conn->data;
+ tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
+ long timeout_ms = tftp_state_timeout(conn, &event);
+
+ *done = FALSE;
+
+ if(timeout_ms <= 0) {
+ failf(data, "TFTP response timeout");
+ return CURLE_OPERATION_TIMEDOUT;
+ }
+ else if(event != TFTP_EVENT_NONE) {
+ result = tftp_state_machine(state, event);
+ if(result != CURLE_OK)
+ return(result);
+ *done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
+ if(*done)
+ /* Tell curl we're done */
+ Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
+ }
+ else {
+ /* no timeouts to handle, check our socket */
+ rc = Curl_socket_ready(state->sockfd, CURL_SOCKET_BAD, 0);
+
+ if(rc == -1) {
+ /* bail out */
+ int error = SOCKERRNO;
+ failf(data, "%s", Curl_strerror(conn, error));
+ state->event = TFTP_EVENT_ERROR;
+ }
+ else if(rc != 0) {
+ result = tftp_receive_packet(conn);
+ if(result != CURLE_OK)
+ return(result);
+ result = tftp_state_machine(state, state->event);
+ if(result != CURLE_OK)
+ return(result);
+ *done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
+ if(*done)
+ /* Tell curl we're done */
+ Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
+ }
+ /* if rc == 0, then select() timed out */
+ }
+
+ return result;
+}
+
+/**********************************************************
+ *
+ * tftp_doing
+ *
+ * Called from multi.c while DOing
+ *
+ **********************************************************/
+static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done)
+{
+ CURLcode result;
+ result = tftp_multi_statemach(conn, dophase_done);
+
+ if(*dophase_done) {
+ DEBUGF(infof(conn->data, "DO phase is complete\n"));
+ }
+ return result;
+}
+
+/**********************************************************
+ *
+ * tftp_peform
+ *
+ * Entry point for transfer from tftp_do, sarts state mach
+ *
+ **********************************************************/
+static CURLcode tftp_perform(struct connectdata *conn, bool *dophase_done)
+{
+ CURLcode result = CURLE_OK;
+ tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
+
+ *dophase_done = FALSE;
+
+ result = tftp_state_machine(state, TFTP_EVENT_INIT);
+
+ if(state->state == TFTP_STATE_FIN || result != CURLE_OK)
+ return(result);
+
+ if(conn->data->state.used_interface == Curl_if_multi)
+ tftp_multi_statemach(conn, dophase_done);
+ else {
+ result = tftp_easy_statemach(conn);
+ *dophase_done = TRUE; /* with the easy interface we are done here */
+ }
+
+ if(*dophase_done)
+ DEBUGF(infof(conn->data, "DO phase is complete\n"));
+
+ return result;
+}
+
+
+/**********************************************************
+ *
+ * tftp_do
+ *
+ * The do callback
+ *
+ * This callback initiates the TFTP transfer
+ *
+ **********************************************************/
+
+static CURLcode tftp_do(struct connectdata *conn, bool *done)
+{
+ tftp_state_data_t *state;
+ CURLcode code;
+
+ *done = FALSE;
+
+ /*
+ Since connections can be re-used between SessionHandles, this might be a
+ connection already existing but on a fresh SessionHandle struct so we must
+ make sure we have a good 'struct TFTP' to play with. For new connections,
+ the struct TFTP is allocated and setup in the tftp_connect() function.
+ */
+ Curl_reset_reqproto(conn);
+
+ if(!conn->proto.tftpc) {
+ code = tftp_connect(conn, done);
+ if(code)
+ return code;
+ }
+ state = (tftp_state_data_t *)conn->proto.tftpc;
+
+ code = tftp_perform(conn, done);
+
+ /* If tftp_perform() returned an error, use that for return code. If it
+ was OK, see if tftp_translate_code() has an error. */
+ if(code == CURLE_OK)
+ /* If we have encountered an internal tftp error, translate it. */
+ code = tftp_translate_code(state->error);
+
+ return code;
+}
+
+static CURLcode tftp_setup_connection(struct connectdata * conn)
+{
+ struct SessionHandle *data = conn->data;
+ char * type;
+ char command;
+
+ conn->socktype = SOCK_DGRAM; /* UDP datagram based */
+
+ /* TFTP URLs support an extension like ";mode=<typecode>" that
+ * we'll try to get now! */
+ type = strstr(data->state.path, ";mode=");
+
+ if(!type)
+ type = strstr(conn->host.rawalloc, ";mode=");
+
+ if(type) {
+ *type = 0; /* it was in the middle of the hostname */
+ command = Curl_raw_toupper(type[6]);
+
+ switch (command) {
+ case 'A': /* ASCII mode */
+ case 'N': /* NETASCII mode */
+ data->set.prefer_ascii = TRUE;
+ break;
+
+ case 'O': /* octet mode */
+ case 'I': /* binary mode */
+ default:
+ /* switch off ASCII */
+ data->set.prefer_ascii = FALSE;
+ break;
+ }
+ }
+
+ return CURLE_OK;
+}
+#endif