/**************************************************************************** * system/zmodem/zm_receive.c * * Copyright (C) 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * References: * "The ZMODEM Inter Application File Transfer Protocol", Chuck Forsberg, * Omen Technology Inc., October 14, 1988 * * This is an original work, but I want to make sure that credit is given * where due: Parts of the state machine design were inspired by the * Zmodem library of Edward A. Falk, dated January, 1995. License * unspecified. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include "system/zmodem.h" #include "zm.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Private Types ****************************************************************************/ /* Zmodem receive states. * * A simple transaction, one file, no errors, no CHALLENGE, overlapped I/O: * These happen when zm_read() is called: * * Sender Receiver State * -------------- ------------ -------- * "rz\r" ----> * ZRQINIT ----> * <---- ZRINIT ZMR_START * ZSINIT ----> * <---- ZACK ZMR_INITWAIT * ZFILE ----> * <---- ZRPOS ZMR_FILEINFO * ZDATA ----> * <---- ZCRC ZMR_CRCWAIT * ZCRC ----> ZMR_READREADY * Data packets ----> ZMR_READING * Last packet ----> * ZEOF ----> * <---- ZRINIT * ZFIN ----> * <---- ZFIN ZMR_FINISH * OO ----> ZMR_DONE */ enum zmrs_e { ZMR_START = 0, /* Sent ZRINIT, waiting for ZFILE or ZSINIT */ ZMR_INITWAIT, /* Received ZSINIT, sent ZACK, waiting for ZFILE */ ZMR_FILEINFO, /* Received ZFILE, sent ZRPOS, waiting for filename in ZDATA */ ZMR_CRCWAIT, /* Received ZDATA filename, send ZCRC, wait for ZCRC response */ ZMR_READREADY, /* Received ZDATA filename and ZCRC, ready for data packets */ ZMR_READING, /* Reading data */ ZMR_FINISH, /* Received ZFIN, sent ZFIN, waiting for "OO" or ZRQINIT */ ZMR_COMMAND, /* Waiting for command data */ ZMR_MESSAGE, /* Waiting for message from receiver */ ZMR_DONE /* Finished with transfer */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Transition actions */ static int zmr_zrinit(FAR struct zm_state_s *pzm); static int zmr_zsinit(FAR struct zm_state_s *pzm); static int zmr_zsrintdata(FAR struct zm_state_s *pzm); static int zmr_startto(FAR struct zm_state_s *pzm); static int zmr_freecnt(FAR struct zm_state_s *pzm); static int zmr_zcrc(FAR struct zm_state_s *pzm); static int zmr_nakcrc(FAR struct zm_state_s *pzm); static int zmr_zfile(FAR struct zm_state_s *pzm); static int zmr_zdata(FAR struct zm_state_s *pzm); static int zmr_badrpos(FAR struct zm_state_s *pzm); static int zmr_filename(FAR struct zm_state_s *pzm); static int zmr_filedata(FAR struct zm_state_s *pzm); static int zmr_rcvto(FAR struct zm_state_s *pzm); static int zmr_fileto(FAR struct zm_state_s *pzm); static int zmr_cmddata(FAR struct zm_state_s *pzm); static int zmr_zeof(FAR struct zm_state_s *pzm); static int zmr_zfin(FAR struct zm_state_s *pzm); static int zmr_finto(FAR struct zm_state_s *pzm); static int zmr_oo(FAR struct zm_state_s *pzm); static int zmr_message(FAR struct zm_state_s *pzm); static int zmr_zstderr(FAR struct zm_state_s *pzm); static int zmr_cmdto(FAR struct zm_state_s *pzm); static int zmr_doneto(FAR struct zm_state_s *pzm); static int zmr_error(FAR struct zm_state_s *pzm); /* Internal helpers */ static int zmr_parsefilename(FAR struct zmr_state_s *pzmr, FAR const uint8_t *namptr); static int zmr_openfile(FAR struct zmr_state_s *pzmr, uint32_t crc); static int zmr_fileerror(FAR struct zmr_state_s *pzmr, uint8_t type, uint32_t data); static void zmr_filecleanup(FAR struct zmr_state_s *pzmr); /**************************************************************************** * Private Data ****************************************************************************/ /* Events handled in state ZMR_START - Sent ZRINIT, waiting for ZFILE or * ZSINIT */ static const struct zm_transition_s g_zmr_start[] = { {ZME_SINIT, false, ZMR_INITWAIT, zmr_zsinit}, {ZME_FILE, false, ZMR_FILEINFO, zmr_zfile}, {ZME_RQINIT, false, ZMR_START, zmr_zrinit}, {ZME_FIN, true, ZMR_FINISH, zmr_zfin}, {ZME_NAK, true, ZMR_START, zmr_zrinit}, {ZME_FREECNT, false, ZMR_START, zmr_freecnt}, {ZME_COMMAND, false, ZMR_COMMAND, zmr_cmddata}, {ZME_STDERR, false, ZMR_MESSAGE, zmr_message}, {ZME_TIMEOUT, false, ZMR_START, zmr_startto}, {ZME_ERROR, false, ZMR_START, zmr_error} }; /* Events handled in state ZMR_INITWAIT - Received ZSINIT, sent ZACK, * waiting for ZFILE. */ static const struct zm_transition_s g_zmr_initwait[] = { {ZME_DATARCVD, false, ZMR_START, zmr_zsrintdata}, {ZME_TIMEOUT, false, ZMR_INITWAIT, zmr_rcvto}, {ZME_ERROR, false, ZMR_INITWAIT, zmr_error} }; /* Events handled in state ZMR_FILEINFO - eceived ZFILE, sent ZRPOS, waiting * for filename in ZDATA */ static const struct zm_transition_s g_zmr_fileinfo[] = { {ZME_DATARCVD, false, ZMR_READREADY, zmr_filename}, {ZME_TIMEOUT, false, ZMR_FILEINFO, zmr_rcvto}, {ZME_ERROR, false, ZMR_FILEINFO, zmr_error} }; /* Events handled in state ZMR_CRCWAIT - Received ZDATA filename, send ZCRC, * wait for ZCRC response */ static const struct zm_transition_s g_zmr_crcwait[] = { {ZME_CRC, false, ZMR_READREADY, zmr_zcrc}, {ZME_NAK, false, ZMR_CRCWAIT, zmr_nakcrc}, {ZME_RQINIT, true, ZMR_START, zmr_zrinit}, {ZME_FIN, true, ZMR_FINISH, zmr_zfin}, {ZME_TIMEOUT, false, ZMR_CRCWAIT, zmr_fileto}, {ZME_ERROR, false, ZMR_CRCWAIT, zmr_error} }; /* Events handled in state ZMR_READREADY - Received ZDATA filename and ZCRC, * ready for data packets */ static const struct zm_transition_s g_zmr_readready[] = { {ZME_DATA, false, ZMR_READING, zmr_zdata}, {ZME_NAK, false, ZMR_READREADY, zmr_badrpos}, {ZME_EOF, false, ZMR_START, zmr_zeof}, {ZME_RQINIT, true, ZMR_START, zmr_zrinit}, {ZME_FILE, false, ZMR_READREADY, zmr_badrpos}, {ZME_FIN, true, ZMR_FINISH, zmr_zfin}, {ZME_TIMEOUT, false, ZMR_READREADY, zmr_fileto}, {ZME_ERROR, false, ZMR_READREADY, zmr_error} }; /* Events handled in the state ZMR_READING - Reading data */ static const struct zm_transition_s g_zmr_reading[] = { {ZME_RQINIT, true, ZMR_START, zmr_zrinit}, {ZME_FILE, false, ZMR_FILEINFO, zmr_zfile}, {ZME_NAK, true, ZMR_READREADY, zmr_badrpos}, {ZME_FIN, true, ZMR_FINISH, zmr_zfin}, {ZME_DATA, false, ZMR_READING, zmr_zdata}, {ZME_EOF, true, ZMR_START, zmr_zeof}, {ZME_DATARCVD, false, ZMR_READING, zmr_filedata}, {ZME_TIMEOUT, false, ZMR_READING, zmr_fileto}, {ZME_ERROR, false, ZMR_READING, zmr_error} }; /* Events handled in the state ZMR_FINISH - Sent ZFIN, waiting for "OO" or ZRQINIT */ static const struct zm_transition_s g_zmr_finish[] = { {ZME_RQINIT, true, ZMR_START, zmr_zrinit}, {ZME_FILE, true, ZMR_FILEINFO, zmr_zfile}, {ZME_NAK, true, ZMR_FINISH, zmr_zfin}, {ZME_FIN, true, ZMR_FINISH, zmr_zfin}, {ZME_TIMEOUT, false, ZMR_READING, zmr_finto}, {ZME_OO, false, ZMR_READING, zmr_oo}, {ZME_ERROR, false, ZMR_FINISH, zmr_error} }; /* Events handled in the state ZMR_COMMAND - Waiting for command data */ static const struct zm_transition_s g_zmr_command[] = { {ZME_DATARCVD, false, ZMR_COMMAND, zmr_cmddata}, {ZME_TIMEOUT, false, ZMR_COMMAND, zmr_cmdto}, {ZME_ERROR, false, ZMR_COMMAND, zmr_error} }; /* Events handled in ZMR_MESSAGE - Waiting for ZSTDERR data */ static struct zm_transition_s g_zmr_message[] = { {ZME_DATARCVD, false, ZMR_MESSAGE, zmr_zstderr}, {ZME_TIMEOUT, false, ZMR_MESSAGE, zmr_cmdto}, {ZME_ERROR, false, ZMR_MESSAGE, zmr_error} }; /* Events handled in ZMR_DONE -- Finished with transfer. Waiting for "OO" or */ static struct zm_transition_s g_zmr_done[] = { {ZME_TIMEOUT, false, ZMR_DONE, zmr_doneto}, {ZME_ERROR, false, ZMR_DONE, zmr_error} }; /* State x Event table for Zmodem receive. The order of states must * exactly match the order defined in enum zmrs_e */ static const struct zm_transition_s *g_zmr_evtable[] = { g_zmr_start, /* ZMR_START: Sent ZRINIT, waiting for ZFILE or ZSINIT */ g_zmr_initwait, /* ZMR_INITWAIT: Received ZSINIT, sent ZACK, waiting for ZFILE */ g_zmr_fileinfo, /* XMRS_FILENAME: Received ZFILE, sent ZRPOS, waiting for ZDATA */ g_zmr_crcwait, /* ZMR_CRCWAIT: Received ZDATA, send ZCRC, wait for ZCRC */ g_zmr_readready, /* ZMR_READREADY: Received ZCRC, ready for data packets */ g_zmr_reading, /* ZMR_READING: Reading data */ g_zmr_finish, /* ZMR_FINISH: Sent ZFIN, waiting for "OO" or ZRQINIT */ g_zmr_command, /* ZMR_COMMAND: Waiting for command data */ g_zmr_message, /* ZMR_MESSAGE: Receiver wants to print a message */ g_zmr_done /* ZMR_DONE: Transfer is complete */ }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: zmr_zrinit * * Description: * Resend ZRINIT header in response to ZRQINIT or ZNAK header * * Paragraph 9.5 "If the receiver cannot overlap serial and disk I/O, it * uses the ZRINIT frame to specify a buffer length which the sender will * not overflow. The sending program sends a ZCRCW data subpacket and * waits for a ZACK header before sending the next segment of the file." * ****************************************************************************/ static int zmr_zrinit(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; uint8_t buf[4]; zmdbg("ZMR_STATE %d:->%d Send ZRINIT\n", pzm->state, ZMR_START); pzm->state = ZMR_START; pzm->flags &= ~ZM_FLAG_OO; /* In case we get here from ZMR_FINISH */ /* Send ZRINIT */ pzm->timeout = CONFIG_SYSTEM_ZMODEM_RESPTIME; buf[0] = CONFIG_SYSTEM_ZMODEM_PKTBUFSIZE & 0xff; buf[1] = (CONFIG_SYSTEM_ZMODEM_PKTBUFSIZE >> 8) & 0xff; buf[2] = 0; buf[3] = pzmr->rcaps; return zm_sendhexhdr(pzm, ZRINIT, buf); } /**************************************************************************** * Name: zmr_zsinit * * Description: * Received a ZSINIT header in response to ZRINIT * ****************************************************************************/ static int zmr_zsinit(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; zmdbg("ZMR_STATE %d: Received ZSINIT header\n", pzm->state); /* Get the sender's capabilities */ pzmr->scaps = pzm->hdrdata[4]; /* Does the sender expect control characters to be escaped? */ pzm->flags &= ~ZM_FLAG_ESCCTRL; if ((pzmr->scaps & TESCCTL) != 0) { pzm->flags |= ZM_FLAG_ESCCTRL; } /* Setup to receive a data packet. Enter PSTATE_DATA */ zm_readstate(pzm); return OK; } /**************************************************************************** * Name: zmr_startto * * Description: * Timed out waiting for ZSINIT or ZFILE. * ****************************************************************************/ static int zmr_startto(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; pzmr->ntimeouts++; zmdbg("ZMR_STATE %d: %d timeouts waiting for ZSINIT or ZFILE\n", pzm->state, pzmr->ntimeouts); if (pzmr->ntimeouts > 4) { /* Send ZRINIT again */ return zmr_zrinit(pzm); } /* This will stop the file transfer */ return -ETIMEDOUT; } /**************************************************************************** * Name: zmr_zsrintdata * * Description: * Received the rest of the ZSINIT packet. * ****************************************************************************/ static int zmr_zsrintdata(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; uint8_t by[4]; zmdbg("PSTATE %d:%d->%d:%d. Received the rest of the ZSINIT packet\n", pzm->pstate, pzm->psubstate, PSTATE_IDLE, PIDLE_ZPAD); pzm->pstate = PSTATE_IDLE; pzm->psubstate = PIDLE_ZPAD; /* NAK if the CRC was bad */ if ((pzm->flags & ZM_FLAG_CRKOK) == 0) { return zm_sendhexhdr(pzm, ZNAK, g_zeroes); } /* Release any previously allocated attention strings */ if (pzmr->attn != NULL) { free(pzmr->attn); } /* Get the new attention string */ pzmr->attn = NULL; if (pzm->pktbuf[0] != '\0') { pzmr->attn = strdup((char *)pzm->pktbuf); } /* And send ZACK */ zm_be32toby(CONFIG_SYSTEM_ZMODEM_SERIALNO, by); return zm_sendhexhdr(pzm, ZACK, by); } /**************************************************************************** * Name: zmr_freecnt * * Description: * TODO: This is supposed to return the amount of free space on the media. * We just return a really big number now. * ****************************************************************************/ static int zmr_freecnt(FAR struct zm_state_s *pzm) { uint8_t by[4]; zmdbg("ZMR_STATE %d\n", pzm->state); zm_be32toby(0xffffffff, by); return zm_sendhexhdr(pzm, ZACK, by); } /**************************************************************************** * Name: zmr_zcrc * * Description: * Received file CRC. Need to accept or reject it. * ****************************************************************************/ static int zmr_zcrc(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; /* Get the remote file CRC */ pzmr->crc = zm_bytobe32(pzm->hdrdata); /* And create the local file */ zmdbg("ZMR_STATE %d: CRC=%08x call zmr_openfile\n", pzmr->crc, pzm->state); return zmr_openfile(pzmr, zm_bytobe32(pzm->hdrdata + 1)); } /**************************************************************************** * Name: zmr_nakcrc * * Description: * The sender responded to ZCRC with NAK. Resend the ZCRC. * ****************************************************************************/ static int zmr_nakcrc(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d: Send ZCRC\n", pzm->state); return zm_sendhexhdr(pzm, ZCRC, g_zeroes); } /**************************************************************************** * Name: zmr_zfile * * Description: * Received ZFILE. Cache the flags and set up to receive filename in ZDATA. * ****************************************************************************/ static int zmr_zfile(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; zmdbg("ZMR_STATE %d\n", pzm->state); pzm->nerrors = 0; pzm->flags &= ~ZM_FLAG_OO; /* In case we get here from ZMR_FINISH */ /* Cache flags (skipping of the initial header type byte) */ pzmr->f0 = pzmr->cmn.hdrdata[4]; pzmr->f1 = pzmr->cmn.hdrdata[3]; #if 0 /* Not used */ pzmr->f2 = pzmr->cmn.hdrdata[2]; pzmr->f3 = pzmr->cmn.hdrdata[1]; #endif /* Setup to receive a data packet. Enter PSTATE_DATA */ zm_readstate(pzm); return OK; } /**************************************************************************** * Name: zmr_zdata * * Description: * Received ZDATA header * ****************************************************************************/ static int zmr_zdata(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; zmdbg("ZMR_STATE %d\n", pzm->state); /* Paragraph 8.2: "The receiver compares the file position in the ZDATA * header with the number of characters successfully received to the file. * If they do not agree, a ZRPOS error response is generated to force the * sender to the right position within the file." */ if (zm_bytobe32(pzm->hdrdata + 1) != pzmr->offset) { /* Execute the Attn sequence and then send a ZRPOS header with the * correct position within the file. */ zmdbg("Bad position, send ZRPOS(%ld)\n", (unsigned long)pzmr->offset); return zmr_fileerror(pzmr, ZRPOS, (uint32_t)pzmr->offset); } /* Setup to receive a data packet. Enter PSTATE_DATA */ zm_readstate(pzm); return OK; } /**************************************************************************** * Name: zmr_badrpos * * Description: * Last ZRPOS was bad, resend it * ****************************************************************************/ static int zmr_badrpos(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; uint8_t by[4]; zmdbg("ZMR_STATE %d: Send ZRPOS(%ld)\n", pzm->state, (unsigned long)pzmr->offset); /* Re-send ZRPOS */ zm_be32toby(pzmr->offset, by); return zm_sendhexhdr(pzm, ZRPOS, by); } /**************************************************************************** * Name: zmr_filename * * Description: * Received file information * ****************************************************************************/ static int zmr_filename(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; FAR const uint8_t *pktptr; unsigned long filesize; unsigned long timestamp; unsigned long bremaining; int mode; int serialno; int fremaining; int filetype; int ret; zmdbg("PSTATE %d:%d->%d:%d\n", pzm->pstate, pzm->psubstate, PSTATE_IDLE, PIDLE_ZPAD); zmdbg("ZMR_STATE %d\n", pzm->state); /* Back to the IDLE state */ pzm->pstate = PSTATE_IDLE; pzm->psubstate = PIDLE_ZPAD; /* Verify that the CRC was correct */ if ((pzm->flags & ZM_FLAG_CRKOK) == 0) { zmdbg("ZMR_STATE %d->%d: ERROR: Bad CRC, send ZNAK\n", pzm->state, ZMR_START); /* Send NACK if the CRC is bad */ pzm->state = ZMR_START; return zm_sendhexhdr(pzm, ZNAK, g_zeroes); } /* Discard any previous local file names */ if (pzmr->filename != NULL) { free(pzmr->filename); pzmr->filename = NULL; } /* Parse the new file name from the beginning of the packet and verify * that we can use it. */ pktptr = pzmr->cmn.pktbuf; ret = zmr_parsefilename(pzmr, pktptr); if (ret < 0) { zmdbg("ZMR_STATE %d->%d: ERROR: Failed to parse filename. Send ZSKIP: %d\n", pzm->state, ZMR_START, ret); pzmr->cmn.state = ZMR_START; return zm_sendhexhdr(&pzmr->cmn, ZSKIP, g_zeroes); } /* Skip over the file name (and its NUL termination) */ pktptr += (strlen((FAR const char *)pktptr) + 1); /* ZFILE: Following the file name are: * * length timestamp mode serial-number files-remaining bytes-remaining file-type */ filesize = 0; timestamp = 0; mode = 0; serialno = 0; fremaining = 0; bremaining = 0; filetype = 0; sscanf((FAR char *)pktptr, "%lu %lo %o %o %d %lu %d", &filesize, ×tamp, &mode, &serialno, &fremaining, &bremaining, &filetype); /* Only a few of these values are retained in this implementation */ pzmr->filesize = (off_t)filesize; #ifdef CONFIG_SYSTEM_ZMODEM_TIMESTAMPS pzmr->timestamp = (time_t)timestamp; #endif /* Check if we need to send the CRC */ if ((pzmr->f1 & ZMMASK) == ZMCRC) { zmdbg("ZMR_STATE %d->%d\n", pzm->state, ZMR_CRCWAIT); pzm->state = ZMR_CRCWAIT; return zm_sendhexhdr(pzm, ZCRC, g_zeroes); } /* We are ready to receive file data packets */ zmdbg("ZMR_STATE %d->%d\n", pzm->state, ZMR_READREADY); pzm->state = ZMR_READREADY; return zmr_openfile(pzmr, 0); } /**************************************************************************** * Name: zmr_filedata * * Description: * Received file data * ****************************************************************************/ static int zmr_filedata(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; uint8_t by[4]; int ret; zmdbg("ZMR_STATE %d\n", pzm->state); /* Check if the CRC is okay */ if ((pzm->flags & ZM_FLAG_CRKOK) == 0) { zmdbg("ERROR: Bad crc, send ZRPOS(%ld)\n", (unsigned long)pzmr->offset); /* No.. increment the count of errors */ pzm->nerrors++; zmdbg("%d data errors\n", pzm->nerrors); /* If the count of errors exceeds the configurable limit, then cancel * the transfer */ if (pzm->nerrors > CONFIG_SYSTEM_ZMODEM_MAXERRORS) { zmdbg("PSTATE %d:%d->%d:%d\n", pzm->pstate, pzm->psubstate, PSTATE_DATA, PDATA_READ); /* Send the cancel string */ (void)zm_remwrite(pzm->remfd, g_canistr, CANISTR_SIZE); /* Enter PSTATE_DATA */ zm_readstate(pzm); return -EIO; } else { zmdbg("PSTATE %d:%d->%d:%d\n", pzm->pstate, pzm->psubstate, PSTATE_IDLE, PIDLE_ZPAD); zmdbg("ZMR_STATE %d->%d\n", pzm->state, ZMR_READREADY); /* Revert to the ready to read state and send ZRPOS to get in sync */ pzm->state = ZMR_READREADY; pzm->pstate = PSTATE_IDLE; pzm->psubstate = PIDLE_ZPAD; return zmr_fileerror(pzmr, ZRPOS, (uint32_t)pzmr->offset); } } /* Write the packet of data to the file */ ret = zm_writefile(pzmr->outfd, pzm->pktbuf, pzm->pktlen, pzmr->f0 == ZCNL); if (ret < 0) { int errorcode = errno; /* Could not write to the file. */ zmdbg("ERROR: Write to file failed: %d\n", errorcode); zmdbg("PSTATE %d:%d->%d:%d\n", pzm->pstate, pzm->psubstate, PSTATE_IDLE, PIDLE_ZPAD); zmdbg("ZMR_STATE %d->%d\n", pzm->state, ZMR_FINISH); /* Revert to the IDLE state, send ZFERR, and terminate the transfer * with an error. */ pzm->state = ZMR_FINISH; pzm->pstate = PSTATE_IDLE; pzm->psubstate = PIDLE_ZPAD; (void)zmr_fileerror(pzmr, ZFERR, (uint32_t)errorcode); return -errorcode; } zmdbg("offset: %ld nchars: %d pkttype: %02x\n", (unsigned long)pzmr->offset, pzm->pktlen, pzm->pkttype); pzmr->offset += pzm->pktlen; zmdbg("Bytes received: %ld\n", (unsigned long)pzmr->offset); /* If this was the last data subpacket, leave data mode */ if (pzm->pkttype == ZCRCE || pzm->pkttype == ZCRCW) { zmdbg("PSTATE %d:%d->%d:%d: ZCRCE|ZCRCW\n", pzm->pstate, pzm->psubstate, PSTATE_IDLE, PIDLE_ZPAD); zmdbg("ZMR_STATE %d->%d\n", pzm->state, ZMR_READREADY); /* Revert to the IDLE state */ pzm->state = ZMR_READREADY; pzm->pstate = PSTATE_IDLE; pzm->psubstate = PIDLE_ZPAD; } else { /* Setup to receive a data packet. Enter PSTATE_DATA */ zm_readstate(pzm); } /* Special handle for different packet types: * * ZCRCW: Non-streaming, ZACK required * ZCRCG: Streaming, no response * ZCRCQ: Streaming, ZACK required * ZCRCE: End of file, no response */ if (pzm->pkttype == ZCRCQ || pzm->pkttype == ZCRCW) { zmdbg("Send ZACK\n"); zm_be32toby(pzmr->offset, by); return zm_sendhexhdr(pzm, ZACK, by); } return OK; } /**************************************************************************** * Name: zmr_rcvto * * Description: * Timed out waiting: * * 1) In state ZMR_INITWAIT - Received ZSINIT, waiting for data, or * 2) In state XMRS_FILENAME - Received ZFILE, waiting for file _info * ****************************************************************************/ static int zmr_rcvto(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; /* Increment the count of timeouts */ pzmr->ntimeouts++; zmdbg("ZMR_STATE %d: Send timeouts: %d\n", pzm->state, pzmr->ntimeouts); /* If the number of timeouts exceeds a limit, then about the transfer */ if (pzmr->ntimeouts > 4) { return -ETIMEDOUT; } /* Re-send the ZRINIT header */ return zmr_zrinit(pzm); } /**************************************************************************** * Name: zmr_fileto * * Description: * Timed out waiting * 1) In state ZMR_CRCWAIT - Received filename, waiting for CRC, * 2) In state ZMR_READREADY - Received filename, ready to read, or * 3) IN state ZMR_READING - Reading data * ****************************************************************************/ static int zmr_fileto(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; /* Increment the count of timeouts */ pzmr->ntimeouts++; zmdbg("ZMR_STATE %d: %d send timeouts\n", pzm->state, pzmr->ntimeouts); /* If the number of timeouts exceeds a limit, then restart the transfer */ if (pzmr->ntimeouts > 2) { /* Re-send the ZRINIT header */ pzmr->ntimeouts = 0; return zmr_zrinit(pzm); } return pzm->state == ZMR_CRCWAIT ? zmr_nakcrc(pzm) : zmr_badrpos(pzm); } /**************************************************************************** * Name: zmr_zeof * * Description: * Received ZEOF packet. File is now complete * ****************************************************************************/ static int zmr_zeof(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; zmdbg("ZMR_STATE %d: offset=%ld\n", pzm->state, (unsigned long)pzmr->offset); /* Verify the file length */ if (zm_bytobe32(pzm->hdrdata + 1) != pzmr->offset) { zmdbg("ERROR: Bad length\n"); zmdbg("ZMR_STATE %d->%d\n", pzm->state, ZMR_READREADY); pzm->state = ZMR_READREADY; return OK; /* it was probably spurious */ } /* Close the output file. * TODO: if we can't close the file, send a ZFERR. */ close(pzmr->outfd); pzmr->outfd = -1; /* TODO: Set the file timestamp and access privileges */ /* Re-send the ZRINIT header so that we are ready for the next file */ return zmr_zrinit(pzm); } /**************************************************************************** * Name: zmr_cmddata * * Description: * Received command data (not implemented) * ****************************************************************************/ static int zmr_cmddata(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d\n", pzm->state); return OK; } /**************************************************************************** * Name: zmr_zfin * * Description: * Received ZFIN, respond with ZFIN. Wait for ZRQINIT or "OO" * ****************************************************************************/ static int zmr_zfin(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; /* We are finished and will send ZFIN. Transition to the ZMR_FINISH state * and wait for either ZRQINIT meaning that another file follows or "OO" * meaning that we are all done. */ zmdbg("PSTATE %d:%d->%d:%d: Send ZFIN\n", pzm->pstate, pzm->psubstate, PSTATE_IDLE, PIDLE_ZPAD); zmdbg("ZMR_STATE %d\n", pzm->state); pzm->pstate = ZMR_FINISH; pzm->pstate = PSTATE_IDLE; pzm->psubstate = PIDLE_ZPAD; /* Release any resource still held from the last file transfer */ zmr_filecleanup(pzmr); /* Let the parser no that "OO" is a possibility */ pzm->flags |= ZM_FLAG_OO; /* Now send the ZFIN response */ return zm_sendhexhdr(pzm, ZFIN, g_zeroes); } /**************************************************************************** * Name: zmr_finto * * Description: * Timedout in state ZMR_FINISH - Sent ZFIN, waiting for "OO" * ****************************************************************************/ static int zmr_finto(FAR struct zm_state_s *pzm) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s *)pzm; /* Increment the count of timeouts (not really necessary because we are * done). */ pzmr->ntimeouts++; pzm->flags &= ~ZM_FLAG_OO; /* No longer expect "OO" */ zmdbg("ZMR_STATE %d: %d send timeouts\n", pzm->state, pzmr->ntimeouts); /* And terminate the reception with a timeout error */ return -ETIMEDOUT; } /**************************************************************************** * Name: zmr_oo * * Description: * Received "OO" in the ZMR_FINISH state. We are finished! * ****************************************************************************/ static int zmr_oo(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d: Done\n", pzm->state); return ZM_XFRDONE; } /**************************************************************************** * Name: zmr_message * * Description: * The remote system wants to put a message on stderr * ****************************************************************************/ int zmr_message(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d\n", pzm->state); /* Setup to receive a data packet. Enter PSTATE_DATA */ zm_readstate(pzm); return OK; } /**************************************************************************** * Name: zmr_zstderr * * Description: * The remote system wants to put a message on stderr * ****************************************************************************/ static int zmr_zstderr(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d\n", pzm->state); pzm->pktbuf[pzm->pktlen] = '\0'; fprintf(stderr, "Message: %s", (char*)pzm->pktbuf); return OK; } /**************************************************************************** * Name: zmr_cmdto * * Description: * Timed out waiting for command or stderr data * ****************************************************************************/ static int zmr_cmdto(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d: Timed out: No command received\n", pzm->state); /* Terminate the reception with a timeout error */ return -ETIMEDOUT; } /**************************************************************************** * Name: zmr_doneto * * Description: * Timed out in ZMR_DONE state * ****************************************************************************/ static int zmr_doneto(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d: Timeout if ZMR_DONE\n", pzm->state); /* Terminate the reception with a timeout error */ return -ETIMEDOUT; } /**************************************************************************** * Name: zmr_error * * Description: * An unexpected event occurred in this state * ****************************************************************************/ static int zmr_error(FAR struct zm_state_s *pzm) { zmdbg("ZMR_STATE %d: Protocol error, header=%d\n", pzm->state, pzm->hdrdata[0]); pzm->flags |= ZM_FLAG_WAIT; pzm->flags &= ~ZM_FLAG_OO; /* In case we get here from ZMR_FINISH */ return OK; } /**************************************************************************** * Name: zmr_parsefilename * * Description: * Get an appropriate path to open. The path is returned in pzmr->filename. * ****************************************************************************/ static int zmr_parsefilename(FAR struct zmr_state_s *pzmr, FAR const uint8_t *namptr) { static uint32_t uniqno = 0; struct stat buf; uint8_t f0; uint8_t f1; bool exists; int ret; DEBUGASSERT(pzmr && !pzmr->filename); /* Don't allow absolute pathes */ if (*namptr == '/') { return -EINVAL; } /* Extend the relative path to the file storage directory */ asprintf(&pzmr->filename, "%s/%s", CONFIG_SYSTEM_ZMODEM_MOUNTPOINT, namptr); if (!pzmr->filename) { zmdbg("ERROR: Failed to allocate full path %s/%s\n", CONFIG_SYSTEM_ZMODEM_MOUNTPOINT, namptr); return -ENOMEM; } /* Check if the file already exists at this path */ ret = stat(pzmr->filename, &buf); if (ret == OK) { exists = true; } else { int errcode = errno; if (errcode == ENOENT) { exists = false; } else { zmdbg("ERROR: stat of %s failed: %d\n", pzmr->filename, errcode); ret = -errcode; goto errout_with_filename; } } /* If remote end has not specified transfer flags (f0), we can use the * local definitions. We will stick with f0=f1=0 which will be a binary * file. */ f0 = pzmr->f0; f1 = pzmr->f1; zmdbg("File %s f0=%02x, f1=%-2x, exists=%d, size=%ld/%ld\n", pzmr->filename, f0, f1, exists, (long)buf.st_size, (long)pzmr->filesize); /* Are we appending to an existing file? */ if (f0 == ZCRESUM) { /* One corner case: The file exists and is already the requested * size. We already have the file! */ if (exists && buf.st_size == pzmr->filesize) { zmdbg("ZCRESUM: Rejected\n"); ret = -EEXIST; goto errout_with_filename; } /* Otherwise, indicate that we will append to the file (whether it * exists yet or not. */ pzmr->cmn.flags |= ZM_FLAG_APPEND; } /* Check if the first is required to be there and fail if it is not */ if (!exists && (f1 & ZMSKNOLOC) != 0) { zmdbg("ZMSKNOLOC: Rejected\n"); ret = -ENOENT; goto errout_with_filename; } /* Now perform whatever actions are required for this file */ switch (f1 & ZMMASK) { case ZMNEWL: /* Transfer if source newer or longer */ { #ifdef CONFIG_SYSTEM_ZMODEM_TIMESTAMPS zmdbg("ZMNEWL: timestamp=%08lx st_mtime=%08lx\n", (unsigned long)pzmr->timestamp, (unsigned long)buf.st_mtime); #endif zmdbg("ZMNEWL: filesize=%08lx st_size=%08lx\n", (unsigned long)pzmr->filesize, (unsigned long)buf.st_size); if (exists && #ifdef CONFIG_SYSTEM_ZMODEM_TIMESTAMPS pzmr->timestamp <= buf.st_mtime && #endif pzmr->filesize <= buf.st_size) { zmdbg("ZMNEWL: Rejected\n"); ret = -EPERM; goto errout_with_filename; } } break; case ZMCRC: /* Transfer if different CRC or length */ { uint32_t crc = zm_filecrc(&pzmr->cmn, pzmr->filename); zmdbg("ZMCRC: crc=%08x vs. %08x\n", pzmr->crc, crc); zmdbg(" filesize=%08lx st_size=%08lx\n", (unsigned long)pzmr->filesize, (unsigned long)buf.st_size); if (exists && pzmr->filesize == buf.st_size && pzmr->crc == crc) { zmdbg("ZMCRC: Rejected\n"); ret = -EPERM; goto errout_with_filename; } } break; case ZMAPND: /* Append to existing file, if any */ pzmr->cmn.flags |= ZM_FLAG_APPEND; case 0: /* Implementation dependent */ case ZMCLOB: /* Replace existing file */ break; case ZMNEW: /* Transfer if source is newer */ { #ifdef CONFIG_SYSTEM_ZMODEM_TIMESTAMPS zmdbg("ZMNEWL: timestamp=%08lx st_mtime=%08lx\n", (unsigned long)pzmr->timestamp, (unsigned long)buf.st_mtime); if (exists && pzmr->timestamp <= buf.st_mtime) { zmdbg("ZMNEW: Rejected\n"); ret = -EPERM; goto errout_with_filename; } #endif } break; case ZMDIFF: /* Transfer if dates or lengths different */ { #ifdef CONFIG_SYSTEM_ZMODEM_TIMESTAMPS zmdbg("ZMDIFF: timestamp=%08lx st_mtime=%0l8x\n", (unsigned long)pzmr->timestamp, (unsigned long)buf.st_mtime); #endif zmdbg("ZMDIFF: filesize=%08lx st_size=%08lx\n", (unsigned long)pzmr->filesize, (unsigned long)buf.st_size); if (exists && #ifdef CONFIG_SYSTEM_ZMODEM_TIMESTAMPS pzmr->timestamp == buf.st_mtime && #endif pzmr->filesize == buf.st_size) { zmdbg("ZMDIFF: Rejected\n"); ret = -EPERM; goto errout_with_filename; } } break; case ZMPROT: /* Protect: transfer only if dest doesn't exist */ { if (exists) { zmdbg("ZMPROT: Rejected\n"); ret = -EPERM; goto errout_with_filename; } } break; case ZMCHNG: /* Change filename if destination exists */ { FAR char *candidate; /* Does the file exist? */ if (exists) { /* Yes.. loop until we create a unique file name */ while (exists) { /* Create a candidate file name */ asprintf(&candidate, "%s_%d", pzmr->filename, ++uniqno); if (!candidate) { zmdbg("ERROR: Failed to allocate candidate %s_%d\n", pzmr->filename, uniqno); ret = -ENOMEM; goto errout_with_filename; } /* Does the candidate also exist? */ ret = stat(candidate, &buf); if (ret < 0) { int errcode = errno; if (errcode != ENOENT) { zmdbg("ERROR: stat of %s failed: %d\n", candidate, errcode); } /* Free the old filename and replace it with the candidate */ free(pzmr->filename); pzmr->filename = candidate; exists = false; } } } } break; default: ret = -EINVAL; goto errout_with_filename; } /* We have accepted pzmr->filename. If the file exists and we are not * appending to it, then unlink the old file now. */ if (exists && (pzmr->cmn.flags & ZM_FLAG_APPEND) == 0) { ret = unlink(pzmr->filename); if (ret != OK) { int errorcode = errno; zmdbg("ERROR: unlink of %s failed: %d\n", pzmr->filename, errorcode); ret = -errorcode; goto errout_with_filename; } } zmdbg("Accepted filename: %s\n", pzmr->filename); return OK; errout_with_filename: free(pzmr->filename); pzmr->filename = NULL; return ret; } /**************************************************************************** * Name: zmr_openfile * * Description: * If no output file has been opened to receive the data, then open the * file for output whose name is in pzm->pktbuf. * ****************************************************************************/ static int zmr_openfile(FAR struct zmr_state_s *pzmr, uint32_t crc) { off_t offset; uint8_t by[4]; /* Has an output file already been opened? Do we have a file name? */ if (pzmr->outfd < 0) { /* No.. We should have a filename from the ZFILE packet? */ if (!pzmr->filename) { zmdbg("No filename!\n"); goto skip; } /* Yes.. then open this file for output */ pzmr->outfd = open((FAR char *)pzmr->filename, O_WRONLY | O_CREAT | O_TRUNC, 0644); if (pzmr->outfd < 0) { zmdbg("ERROR: Failed to open %s: %d\n", pzmr->filename, errno); goto skip; } } /* Are we appending/resuming a transfer? */ offset = 0; if (pzmr->f0 == ZCRESUM) { /* Yes... get the current file position */ offset = lseek(pzmr->outfd, 0, SEEK_CUR); if (offset == (off_t)-1) { zmdbg("ERROR: lseek failed: %d\n", errno); goto skip; } } zmdbg("ZMR_STATE %d->%d: Send ZRPOS(%ld)\n", pzmr->cmn.state, ZMR_READREADY, (unsigned long)offset); pzmr->offset = offset; pzmr->cmn.state = ZMR_READREADY; zm_be32toby(pzmr->offset, by); return zm_sendhexhdr(&pzmr->cmn, ZRPOS, by); /* We get here on any failures. This file will be skipped. */ skip: zmdbg("ZMR_STATE %d->%d: Send ZSKIP\n", pzmr->cmn.state, ZMR_START); pzmr->cmn.state = ZMR_START; return zm_sendhexhdr(&pzmr->cmn, ZSKIP, g_zeroes); } /**************************************************************************** * Name: zmr_fileerror * * Description: * A receiver-detected file error has occurred. Send Attn followed by * the specified header (ZRPOS or XFERR). * ****************************************************************************/ static int zmr_fileerror(FAR struct zmr_state_s *pzmr, uint8_t type, uint32_t data) { FAR uint8_t *src; FAR uint8_t *dest; uint8_t by[4]; /* Set the state back to IDLE to abort the transfer */ zmdbg("PSTATE %d:%d->%d:%d\n", pzmr->cmn.pstate, pzmr->cmn.psubstate, PSTATE_IDLE, PIDLE_ZPAD); pzmr->cmn.pstate = PSTATE_IDLE; pzmr->cmn.psubstate = PIDLE_ZPAD; /* Send Attn */ if (pzmr->attn != NULL) { ssize_t nwritten; int len; /* Copy the attention string to the I/O buffer (pausing is ATTNPSE * is encountered. */ dest = pzmr->cmn.pktbuf; for (src = (FAR void *)pzmr->attn; *src != '\0'; src++) { if (*src == ATTNBRK ) { #ifdef CONFIG_SYSTEM_ZMODEM_SENDBREAK /* Send a break * TODO: tcsendbreak() does not yet exist. */ tcsendbreak(pzm->remfd, 0); #endif } else if (*src == ATTNPSE) { /* Pause for 1 second */ sleep(1); } else { /* Transfer the character */ *dest++ = *src; } } /* Null-terminate and send */ *dest++ = '\0'; len = strlen((FAR char *)pzmr->cmn.pktbuf); nwritten = zm_remwrite(pzmr->cmn.remfd, pzmr->cmn.pktbuf, len); if (nwritten < 0) { zmdbg("ERROR: zm_remwrite failed: %d\n", (int)nwritten); return (int)nwritten; } } /* Send the specified header */ zm_be32toby(data, by); return zm_sendhexhdr(&pzmr->cmn, type, by); } /**************************************************************************** * Name: zmr_filecleanup * * Description: * Release resources tied up by the last file transfer * ****************************************************************************/ static void zmr_filecleanup(FAR struct zmr_state_s *pzmr) { /* Make sure that the file is closed */ if (pzmr->outfd >= 0) { close(pzmr->outfd); pzmr->outfd = -1; } /* Deallocate the file name and attention strings */ if (pzmr->filename) { free(pzmr->filename); pzmr->filename = NULL; } if (pzmr->attn) { free(pzmr->attn); pzmr->attn = NULL; } } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: zmr_initialize * * Description: * Initialize for Zmodem receive operation * * Input Parameters: * remfd - The R/W file/socket descriptor to use for communication with the * remote peer. * * Returned Value: * An opaque handle that can be use with zmr_receive() and zmr_release(). * ****************************************************************************/ ZMRHANDLE zmr_initialize(int remfd) { FAR struct zmr_state_s *pzmr; FAR struct zm_state_s *pzm; int ret; /* Allocate a new Zmodem receive state structure */ pzmr = (FAR struct zmr_state_s*)zalloc(sizeof(struct zmr_state_s)); if (pzmr) { /* Initialize the state structure */ pzm = &pzmr->cmn; pzm->evtable = g_zmr_evtable; pzm->state = ZMR_START; pzm->pstate = PSTATE_IDLE; pzm->psubstate = PIDLE_ZPAD; pzm->remfd = remfd; pzmr->outfd = -1; /* Create a timer to handle timeout events */ ret = zm_timerinit(pzm); if (ret < 0) { zmdbg("ERROR: zm_timerinit failed: %d\n", ret); free(pzmr); return (ZMRHANDLE)NULL; } /* Note that no action is taken now... a timeout of zero is set (because * of the memset). If there is nothing pending, ZRINIT will be sent. */ zmdbg("Initial state: %d\n", pzm->state); } return (ZMRHANDLE)pzmr; } /**************************************************************************** * Name: zmr_receive * * Description: * Receive file(s) sent from the remote peer. * * Input Parameters: * handle - The handler created by zmr_initialize(). * * Returned Value: * Zero on success; a negated errno value on failure. * ****************************************************************************/ int zmr_receive(ZMRHANDLE handle) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s*)handle; /* The first thing that should happen is to receive ZRQINIT from the * remote sender. This could take while so use a long timeout. */ pzmr->cmn.timeout = CONFIG_SYSTEM_ZMODEM_CONNTIME; /* Then the state machine data pump will do the rest of the job */ return zm_datapump(&pzmr->cmn); } /**************************************************************************** * Name: zmr_release * * Description: * Called by the user when there are no more files to receive. * * Input Parameters: * handle - The handler created by zmr_initialize(). * * Returned Value: * Zero on success; a negated errno value on failure. * ****************************************************************************/ int zmr_release(ZMRHANDLE handle) { FAR struct zmr_state_s *pzmr = (FAR struct zmr_state_s*)handle; int ret; /* Send ZFIN */ pzmr->cmn.state = ZMR_FINISH; ret = zm_sendhexhdr(&pzmr->cmn, ZFIN, g_zeroes); zmdbg("ZMR_STATE %d: Send ZFIN\n", pzmr->cmn.state); /* Release the timer resources */ (void)zm_timerrelease(&pzmr->cmn); /* Clean up any resouces that may be held from the last file transfer */ zmr_filecleanup(pzmr); /* Then release the receive state structure itself */ free(pzmr); return ret; }