138451Smsmith/* $NetBSD: tftp.c,v 1.4 1997/09/17 16:57:07 drochner Exp $ */ 238451Smsmith 338451Smsmith/* 438451Smsmith * Copyright (c) 1996 538451Smsmith * Matthias Drochner. All rights reserved. 638451Smsmith * 738451Smsmith * Redistribution and use in source and binary forms, with or without 838451Smsmith * modification, are permitted provided that the following conditions 938451Smsmith * are met: 1038451Smsmith * 1. Redistributions of source code must retain the above copyright 1138451Smsmith * notice, this list of conditions and the following disclaimer. 1238451Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1338451Smsmith * notice, this list of conditions and the following disclaimer in the 1438451Smsmith * documentation and/or other materials provided with the distribution. 1538451Smsmith * 3. All advertising materials mentioning features or use of this software 1638451Smsmith * must display the following acknowledgement: 1738451Smsmith * This product includes software developed for the NetBSD Project 1838451Smsmith * by Matthias Drochner. 1938451Smsmith * 4. The name of the author may not be used to endorse or promote products 2038451Smsmith * derived from this software without specific prior written permission. 2138451Smsmith * 2238451Smsmith * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2338451Smsmith * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2438451Smsmith * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2538451Smsmith * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2638451Smsmith * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2738451Smsmith * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2838451Smsmith * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2938451Smsmith * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3038451Smsmith * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3138451Smsmith * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3238451Smsmith */ 3338451Smsmith 3484221Sdillon#include <sys/cdefs.h> 3584221Sdillon__FBSDID("$FreeBSD$"); 3684221Sdillon 3738451Smsmith/* 3838451Smsmith * Simple TFTP implementation for libsa. 3938451Smsmith * Assumes: 4038451Smsmith * - socket descriptor (int) at open_file->f_devdata 4138451Smsmith * - server host IP in global servip 4238451Smsmith * Restrictions: 4338451Smsmith * - read only 4438451Smsmith * - lseek only with SEEK_SET or SEEK_CUR 4538451Smsmith * - no big time differences between transfers (<tftp timeout) 4638451Smsmith */ 4738451Smsmith 4838451Smsmith#include <sys/types.h> 4938451Smsmith#include <sys/stat.h> 5038451Smsmith#include <netinet/in.h> 5138451Smsmith#include <netinet/udp.h> 5238451Smsmith#include <netinet/in_systm.h> 5338451Smsmith#include <arpa/tftp.h> 5438451Smsmith 5538451Smsmith#include <string.h> 5638451Smsmith 5738451Smsmith#include "stand.h" 5838451Smsmith#include "net.h" 5938451Smsmith#include "netif.h" 6038451Smsmith 6138451Smsmith#include "tftp.h" 6238451Smsmith 63223124Srodrigcstruct tftp_handle; 64223124Srodrigc 6539468Smsmithstatic int tftp_open(const char *path, struct open_file *f); 6638451Smsmithstatic int tftp_close(struct open_file *f); 67223488Srodrigcstatic int tftp_parse_oack(struct tftp_handle *h, char *buf, size_t len); 6838451Smsmithstatic int tftp_read(struct open_file *f, void *buf, size_t size, size_t *resid); 6938451Smsmithstatic int tftp_write(struct open_file *f, void *buf, size_t size, size_t *resid); 7038451Smsmithstatic off_t tftp_seek(struct open_file *f, off_t offset, int where); 71223124Srodrigcstatic int tftp_set_blksize(struct tftp_handle *h, const char *str); 7238451Smsmithstatic int tftp_stat(struct open_file *f, struct stat *sb); 73223488Srodrigcstatic ssize_t sendrecv_tftp(struct tftp_handle *h, 74223124Srodrigc ssize_t (*sproc)(struct iodesc *, void *, size_t), 75223124Srodrigc void *sbuf, size_t ssize, 76223124Srodrigc ssize_t (*rproc)(struct tftp_handle *h, void *, ssize_t, time_t, unsigned short *), 77223124Srodrigc void *rbuf, size_t rsize, unsigned short *rtype); 7838451Smsmith 7938451Smsmithstruct fs_ops tftp_fsops = { 8059766Sjlemon "tftp", 8159766Sjlemon tftp_open, 8259766Sjlemon tftp_close, 8359766Sjlemon tftp_read, 8459766Sjlemon tftp_write, 8559766Sjlemon tftp_seek, 8659766Sjlemon tftp_stat, 8759766Sjlemon null_readdir 8838451Smsmith}; 8938451Smsmith 9038451Smsmithextern struct in_addr servip; 9138451Smsmith 9238451Smsmithstatic int tftpport = 2000; 93223124Srodrigcstatic int is_open = 0; 9438451Smsmith 95223124Srodrigc/* 96223488Srodrigc * The legacy TFTP_BLKSIZE value was SEGSIZE(512). 97223124Srodrigc * TFTP_REQUESTED_BLKSIZE of 1428 is (Ethernet MTU, less the TFTP, UDP and 98223124Srodrigc * IP header lengths). 99223124Srodrigc */ 100223124Srodrigc#define TFTP_REQUESTED_BLKSIZE 1428 10138451Smsmith 102223124Srodrigc/* 103223124Srodrigc * Choose a blksize big enough so we can test with Ethernet 104223124Srodrigc * Jumbo frames in the future. 105223488Srodrigc */ 106223124Srodrigc#define TFTP_MAX_BLKSIZE 9008 107223124Srodrigc 10838451Smsmithstruct tftp_handle { 10938451Smsmith struct iodesc *iodesc; 11038451Smsmith int currblock; /* contents of lastdata */ 11138451Smsmith int islastblock; /* flag */ 11238451Smsmith int validsize; 11338451Smsmith int off; 11438451Smsmith char *path; /* saved for re-requests */ 115223124Srodrigc unsigned int tftp_blksize; 116223488Srodrigc unsigned long tftp_tsize; 11738451Smsmith struct { 11838451Smsmith u_char header[HEADER_SIZE]; 11938451Smsmith struct tftphdr t; 120223124Srodrigc u_char space[TFTP_MAX_BLKSIZE]; 121223128Srodrigc } __packed __aligned(4) lastdata; 12238451Smsmith}; 12338451Smsmith 124223488Srodrigc#define TFTP_MAX_ERRCODE EOPTNEG 125223488Srodrigcstatic const int tftperrors[TFTP_MAX_ERRCODE + 1] = { 12638451Smsmith 0, /* ??? */ 12738451Smsmith ENOENT, 12838451Smsmith EPERM, 12938451Smsmith ENOSPC, 13038451Smsmith EINVAL, /* ??? */ 13138451Smsmith EINVAL, /* ??? */ 13238451Smsmith EEXIST, 133223488Srodrigc EINVAL, /* ??? */ 134223488Srodrigc EINVAL, /* Option negotiation failed. */ 13538451Smsmith}; 13638451Smsmith 137223488Srodrigcstatic int tftp_getnextblock(struct tftp_handle *h); 138223488Srodrigc 139223488Srodrigc/* send error message back. */ 140223488Srodrigcstatic void 141223488Srodrigctftp_senderr(struct tftp_handle *h, u_short errcode, const char *msg) 142223488Srodrigc{ 143223488Srodrigc struct { 144223488Srodrigc u_char header[HEADER_SIZE]; 145223488Srodrigc struct tftphdr t; 146223488Srodrigc u_char space[63]; /* +1 from t */ 147223488Srodrigc } __packed __aligned(4) wbuf; 148223488Srodrigc char *wtail; 149223488Srodrigc int len; 150223488Srodrigc 151223488Srodrigc len = strlen(msg); 152223488Srodrigc if (len > sizeof(wbuf.space)) 153223488Srodrigc len = sizeof(wbuf.space); 154223488Srodrigc 155223488Srodrigc wbuf.t.th_opcode = htons((u_short) ERROR); 156223488Srodrigc wbuf.t.th_code = htons(errcode); 157223488Srodrigc 158223488Srodrigc wtail = wbuf.t.th_msg; 159223488Srodrigc bcopy(msg, wtail, len); 160223488Srodrigc wtail[len] = '\0'; 161223488Srodrigc wtail += len + 1; 162223488Srodrigc 163223488Srodrigc sendudp(h->iodesc, &wbuf.t, wtail - (char *) &wbuf.t); 164223488Srodrigc} 165223488Srodrigc 166223488Srodrigcstatic void 167223488Srodrigctftp_sendack(struct tftp_handle *h) 168223488Srodrigc{ 169223488Srodrigc struct { 170223488Srodrigc u_char header[HEADER_SIZE]; 171223488Srodrigc struct tftphdr t; 172223488Srodrigc } __packed __aligned(4) wbuf; 173223488Srodrigc char *wtail; 174223488Srodrigc 175223488Srodrigc wbuf.t.th_opcode = htons((u_short) ACK); 176223488Srodrigc wtail = (char *) &wbuf.t.th_block; 177223488Srodrigc wbuf.t.th_block = htons((u_short) h->currblock); 178223488Srodrigc wtail += 2; 179223488Srodrigc 180223488Srodrigc sendudp(h->iodesc, &wbuf.t, wtail - (char *) &wbuf.t); 181223488Srodrigc} 182223488Srodrigc 183223488Srodrigcstatic ssize_t 184223124Srodrigcrecvtftp(struct tftp_handle *h, void *pkt, ssize_t len, time_t tleft, 185223124Srodrigc unsigned short *rtype) 18638451Smsmith{ 187223124Srodrigc struct iodesc *d = h->iodesc; 18838451Smsmith struct tftphdr *t; 18938451Smsmith 19079034Smikeh errno = 0; 19179034Smikeh 19238451Smsmith len = readudp(d, pkt, len, tleft); 19338451Smsmith 19477369Smsmith if (len < 4) 19538451Smsmith return (-1); 19638451Smsmith 19738451Smsmith t = (struct tftphdr *) pkt; 198223124Srodrigc *rtype = ntohs(t->th_opcode); 19938451Smsmith switch (ntohs(t->th_opcode)) { 20038451Smsmith case DATA: { 20138451Smsmith int got; 20238451Smsmith 20338451Smsmith if (htons(t->th_block) != d->xid) { 20438451Smsmith /* 20538451Smsmith * Expected block? 20638451Smsmith */ 20738451Smsmith return (-1); 20838451Smsmith } 20938451Smsmith if (d->xid == 1) { 21038451Smsmith /* 21138451Smsmith * First data packet from new port. 21238451Smsmith */ 21392913Sobrien struct udphdr *uh; 21438451Smsmith uh = (struct udphdr *) pkt - 1; 21538451Smsmith d->destport = uh->uh_sport; 21638451Smsmith } /* else check uh_sport has not changed??? */ 21738451Smsmith got = len - (t->th_data - (char *) t); 21838451Smsmith return got; 21938451Smsmith } 22038451Smsmith case ERROR: 221223488Srodrigc if ((unsigned) ntohs(t->th_code) > TFTP_MAX_ERRCODE) { 22238451Smsmith printf("illegal tftp error %d\n", ntohs(t->th_code)); 22338451Smsmith errno = EIO; 22438451Smsmith } else { 225221366Srodrigc#ifdef TFTP_DEBUG 22638451Smsmith printf("tftp-error %d\n", ntohs(t->th_code)); 22738451Smsmith#endif 22838451Smsmith errno = tftperrors[ntohs(t->th_code)]; 22938451Smsmith } 23038451Smsmith return (-1); 231223124Srodrigc case OACK: { 232223124Srodrigc struct udphdr *uh; 233223488Srodrigc int tftp_oack_len; 234223488Srodrigc 235223488Srodrigc /* 236223488Srodrigc * Unexpected OACK. TFTP transfer already in progress. 237223488Srodrigc * Drop the pkt. 238223488Srodrigc */ 239223488Srodrigc if (d->xid != 1) { 240223488Srodrigc return (-1); 241223488Srodrigc } 242223488Srodrigc 243223124Srodrigc /* 244223488Srodrigc * Remember which port this OACK came from, because we need 245223488Srodrigc * to send the ACK or errors back to it. 246223124Srodrigc */ 247223124Srodrigc uh = (struct udphdr *) pkt - 1; 248223124Srodrigc d->destport = uh->uh_sport; 249223488Srodrigc 250223488Srodrigc /* Parse options ACK-ed by the server. */ 251223488Srodrigc tftp_oack_len = len - sizeof(t->th_opcode); 252223488Srodrigc if (tftp_parse_oack(h, t->th_u.tu_stuff, tftp_oack_len) != 0) { 253223488Srodrigc tftp_senderr(h, EOPTNEG, "Malformed OACK"); 254223488Srodrigc errno = EIO; 255223488Srodrigc return (-1); 256223488Srodrigc } 257223124Srodrigc return (0); 258223124Srodrigc } 25938451Smsmith default: 260221366Srodrigc#ifdef TFTP_DEBUG 26138451Smsmith printf("tftp type %d not handled\n", ntohs(t->th_opcode)); 26238451Smsmith#endif 26338451Smsmith return (-1); 26438451Smsmith } 26538451Smsmith} 26638451Smsmith 26738451Smsmith/* send request, expect first block (or error) */ 268223488Srodrigcstatic int 269221358Srodrigctftp_makereq(struct tftp_handle *h) 27038451Smsmith{ 27138451Smsmith struct { 27238451Smsmith u_char header[HEADER_SIZE]; 27338451Smsmith struct tftphdr t; 27438451Smsmith u_char space[FNAME_SIZE + 6]; 275223128Srodrigc } __packed __aligned(4) wbuf; 27638451Smsmith char *wtail; 27738451Smsmith int l; 27838451Smsmith ssize_t res; 27938451Smsmith struct tftphdr *t; 280223124Srodrigc char *tftp_blksize = NULL; 281223124Srodrigc int blksize_l; 282223124Srodrigc unsigned short rtype = 0; 28338451Smsmith 284223124Srodrigc /* 285223124Srodrigc * Allow overriding default TFTP block size by setting 286223124Srodrigc * a tftp.blksize environment variable. 287223124Srodrigc */ 288223124Srodrigc if ((tftp_blksize = getenv("tftp.blksize")) != NULL) { 289223124Srodrigc tftp_set_blksize(h, tftp_blksize); 290223124Srodrigc } 291223124Srodrigc 29238451Smsmith wbuf.t.th_opcode = htons((u_short) RRQ); 29338451Smsmith wtail = wbuf.t.th_stuff; 29438451Smsmith l = strlen(h->path); 295228798Sed#ifdef TFTP_PREPEND_PATH 296228798Sed if (l > FNAME_SIZE - (sizeof(TFTP_PREPEND_PATH) - 1)) 297228798Sed return (ENAMETOOLONG); 298228798Sed bcopy(TFTP_PREPEND_PATH, wtail, sizeof(TFTP_PREPEND_PATH) - 1); 299228798Sed wtail += sizeof(TFTP_PREPEND_PATH) - 1; 300228798Sed#else 301223124Srodrigc if (l > FNAME_SIZE) 302223124Srodrigc return (ENAMETOOLONG); 303228798Sed#endif 30438451Smsmith bcopy(h->path, wtail, l + 1); 30538451Smsmith wtail += l + 1; 30638451Smsmith bcopy("octet", wtail, 6); 30738451Smsmith wtail += 6; 308223124Srodrigc bcopy("blksize", wtail, 8); 309223124Srodrigc wtail += 8; 310223124Srodrigc blksize_l = sprintf(wtail, "%d", h->tftp_blksize); 311223124Srodrigc wtail += blksize_l + 1; 312223124Srodrigc bcopy("tsize", wtail, 6); 313223124Srodrigc wtail += 6; 314223124Srodrigc bcopy("0", wtail, 2); 315223124Srodrigc wtail += 2; 31638451Smsmith 31738451Smsmith t = &h->lastdata.t; 31838451Smsmith 31938451Smsmith /* h->iodesc->myport = htons(--tftpport); */ 32038451Smsmith h->iodesc->myport = htons(tftpport + (getsecs() & 0x3ff)); 32138451Smsmith h->iodesc->destport = htons(IPPORT_TFTP); 32238451Smsmith h->iodesc->xid = 1; /* expected block */ 32338451Smsmith 324223488Srodrigc h->currblock = 0; 325223488Srodrigc h->islastblock = 0; 326223488Srodrigc h->validsize = 0; 327223488Srodrigc 328223124Srodrigc res = sendrecv_tftp(h, &sendudp, &wbuf.t, wtail - (char *) &wbuf.t, 329223124Srodrigc &recvtftp, t, sizeof(*t) + h->tftp_blksize, &rtype); 33038451Smsmith 331223488Srodrigc if (rtype == OACK) 332223488Srodrigc return (tftp_getnextblock(h)); 33338451Smsmith 334223488Srodrigc /* Server ignored our blksize request, revert to TFTP default. */ 335223488Srodrigc h->tftp_blksize = SEGSIZE; 336223488Srodrigc 337223124Srodrigc switch (rtype) { 338223124Srodrigc case DATA: { 339223124Srodrigc h->currblock = 1; 340223124Srodrigc h->validsize = res; 341223124Srodrigc h->islastblock = 0; 342223488Srodrigc if (res < h->tftp_blksize) { 343223124Srodrigc h->islastblock = 1; /* very short file */ 344223488Srodrigc tftp_sendack(h); 345223488Srodrigc } 346223124Srodrigc return (0); 347223124Srodrigc } 348223124Srodrigc case ERROR: 349223124Srodrigc default: 350223124Srodrigc return (errno); 351223124Srodrigc } 352223124Srodrigc 35338451Smsmith} 35438451Smsmith 35538451Smsmith/* ack block, expect next */ 35638451Smsmithstatic int 357221358Srodrigctftp_getnextblock(struct tftp_handle *h) 35838451Smsmith{ 35938451Smsmith struct { 36038451Smsmith u_char header[HEADER_SIZE]; 36138451Smsmith struct tftphdr t; 362223128Srodrigc } __packed __aligned(4) wbuf; 36338451Smsmith char *wtail; 36438451Smsmith int res; 36538451Smsmith struct tftphdr *t; 366223124Srodrigc unsigned short rtype = 0; 36738451Smsmith wbuf.t.th_opcode = htons((u_short) ACK); 36838451Smsmith wtail = (char *) &wbuf.t.th_block; 36938451Smsmith wbuf.t.th_block = htons((u_short) h->currblock); 37038451Smsmith wtail += 2; 37138451Smsmith 37238451Smsmith t = &h->lastdata.t; 37338451Smsmith 37438451Smsmith h->iodesc->xid = h->currblock + 1; /* expected block */ 37538451Smsmith 376223124Srodrigc res = sendrecv_tftp(h, &sendudp, &wbuf.t, wtail - (char *) &wbuf.t, 377223124Srodrigc &recvtftp, t, sizeof(*t) + h->tftp_blksize, &rtype); 37838451Smsmith 37938451Smsmith if (res == -1) /* 0 is OK! */ 38038451Smsmith return (errno); 38138451Smsmith 38238451Smsmith h->currblock++; 38338451Smsmith h->validsize = res; 384223124Srodrigc if (res < h->tftp_blksize) 38538451Smsmith h->islastblock = 1; /* EOF */ 386223124Srodrigc 387223124Srodrigc if (h->islastblock == 1) { 388223124Srodrigc /* Send an ACK for the last block */ 389223124Srodrigc wbuf.t.th_block = htons((u_short) h->currblock); 390223124Srodrigc sendudp(h->iodesc, &wbuf.t, wtail - (char *)&wbuf.t); 391223124Srodrigc } 392223124Srodrigc 39338451Smsmith return (0); 39438451Smsmith} 39538451Smsmith 396223488Srodrigcstatic int 397221358Srodrigctftp_open(const char *path, struct open_file *f) 39838451Smsmith{ 39938451Smsmith struct tftp_handle *tftpfile; 40038451Smsmith struct iodesc *io; 40138451Smsmith int res; 40238451Smsmith 403256244Skan if (strcmp(f->f_dev->dv_name, "net") != 0) { 404256244Skan#ifdef __i386__ 405256244Skan if (strcmp(f->f_dev->dv_name, "pxe") != 0) 406256244Skan return (EINVAL); 407256244Skan#else 40899558Sjake return (EINVAL); 40999558Sjake#endif 410256244Skan } 411111776Smarcel 412223124Srodrigc if (is_open) 413223124Srodrigc return (EBUSY); 414223124Srodrigc 41538451Smsmith tftpfile = (struct tftp_handle *) malloc(sizeof(*tftpfile)); 41638451Smsmith if (!tftpfile) 41738451Smsmith return (ENOMEM); 41838451Smsmith 419223124Srodrigc memset(tftpfile, 0, sizeof(*tftpfile)); 420223124Srodrigc tftpfile->tftp_blksize = TFTP_REQUESTED_BLKSIZE; 42138451Smsmith tftpfile->iodesc = io = socktodesc(*(int *) (f->f_devdata)); 42269739Sps if (io == NULL) 42369739Sps return (EINVAL); 42469739Sps 42538451Smsmith io->destip = servip; 42638451Smsmith tftpfile->off = 0; 42739468Smsmith tftpfile->path = strdup(path); 42839468Smsmith if (tftpfile->path == NULL) { 42939468Smsmith free(tftpfile); 43039468Smsmith return(ENOMEM); 43139468Smsmith } 43238451Smsmith 433193189Sed res = tftp_makereq(tftpfile); 43438451Smsmith 43538451Smsmith if (res) { 43639468Smsmith free(tftpfile->path); 43738451Smsmith free(tftpfile); 43838451Smsmith return (res); 43938451Smsmith } 44038451Smsmith f->f_fsdata = (void *) tftpfile; 441223124Srodrigc is_open = 1; 44238451Smsmith return (0); 44338451Smsmith} 44438451Smsmith 445223488Srodrigcstatic int 446221358Srodrigctftp_read(struct open_file *f, void *addr, size_t size, 447221358Srodrigc size_t *resid /* out */) 44838451Smsmith{ 44938451Smsmith struct tftp_handle *tftpfile; 45038451Smsmith tftpfile = (struct tftp_handle *) f->f_fsdata; 45138451Smsmith 45238451Smsmith while (size > 0) { 45338451Smsmith int needblock, count; 45438451Smsmith 455278602Sian twiddle(32); 45638451Smsmith 457223124Srodrigc needblock = tftpfile->off / tftpfile->tftp_blksize + 1; 45838451Smsmith 459223488Srodrigc if (tftpfile->currblock > needblock) { /* seek backwards */ 460223488Srodrigc tftp_senderr(tftpfile, 0, "No error: read aborted"); 46138451Smsmith tftp_makereq(tftpfile); /* no error check, it worked 46238451Smsmith * for open */ 463223488Srodrigc } 46438451Smsmith 46538451Smsmith while (tftpfile->currblock < needblock) { 46638451Smsmith int res; 46738451Smsmith 46838451Smsmith res = tftp_getnextblock(tftpfile); 46938451Smsmith if (res) { /* no answer */ 470221366Srodrigc#ifdef TFTP_DEBUG 47138451Smsmith printf("tftp: read error\n"); 47238451Smsmith#endif 47338451Smsmith return (res); 47438451Smsmith } 47538451Smsmith if (tftpfile->islastblock) 47638451Smsmith break; 47738451Smsmith } 47838451Smsmith 47938451Smsmith if (tftpfile->currblock == needblock) { 48038451Smsmith int offinblock, inbuffer; 48138451Smsmith 482223124Srodrigc offinblock = tftpfile->off % tftpfile->tftp_blksize; 48338451Smsmith 48438451Smsmith inbuffer = tftpfile->validsize - offinblock; 48538451Smsmith if (inbuffer < 0) { 486221366Srodrigc#ifdef TFTP_DEBUG 48738451Smsmith printf("tftp: invalid offset %d\n", 48838451Smsmith tftpfile->off); 48938451Smsmith#endif 49038451Smsmith return (EINVAL); 49138451Smsmith } 49238451Smsmith count = (size < inbuffer ? size : inbuffer); 49338451Smsmith bcopy(tftpfile->lastdata.t.th_data + offinblock, 49438451Smsmith addr, count); 49538451Smsmith 496136093Sstefanf addr = (char *)addr + count; 49738451Smsmith tftpfile->off += count; 49838451Smsmith size -= count; 49938451Smsmith 50038451Smsmith if ((tftpfile->islastblock) && (count == inbuffer)) 50138451Smsmith break; /* EOF */ 50238451Smsmith } else { 503221366Srodrigc#ifdef TFTP_DEBUG 50438451Smsmith printf("tftp: block %d not found\n", needblock); 50538451Smsmith#endif 50638451Smsmith return (EINVAL); 50738451Smsmith } 50838451Smsmith 50938451Smsmith } 51038451Smsmith 51138451Smsmith if (resid) 51238451Smsmith *resid = size; 51338451Smsmith return (0); 51438451Smsmith} 51538451Smsmith 51638451Smsmithstatic int 517221358Srodrigctftp_close(struct open_file *f) 51838451Smsmith{ 51938451Smsmith struct tftp_handle *tftpfile; 52038451Smsmith tftpfile = (struct tftp_handle *) f->f_fsdata; 52138451Smsmith 52238451Smsmith /* let it time out ... */ 52338451Smsmith 52439468Smsmith if (tftpfile) { 52539468Smsmith free(tftpfile->path); 52638451Smsmith free(tftpfile); 52739468Smsmith } 528223124Srodrigc is_open = 0; 52938451Smsmith return (0); 53038451Smsmith} 53138451Smsmith 532223488Srodrigcstatic int 533221358Srodrigctftp_write(struct open_file *f __unused, void *start __unused, size_t size __unused, 534223124Srodrigc size_t *resid __unused /* out */) 53538451Smsmith{ 53638451Smsmith return (EROFS); 53738451Smsmith} 53838451Smsmith 53938451Smsmithstatic int 540223124Srodrigctftp_stat(struct open_file *f, struct stat *sb) 54138451Smsmith{ 54238451Smsmith struct tftp_handle *tftpfile; 54338451Smsmith tftpfile = (struct tftp_handle *) f->f_fsdata; 54438451Smsmith 54559086Sps sb->st_mode = 0444 | S_IFREG; 54638451Smsmith sb->st_nlink = 1; 54738451Smsmith sb->st_uid = 0; 54838451Smsmith sb->st_gid = 0; 54938451Smsmith sb->st_size = -1; 55038451Smsmith return (0); 55138451Smsmith} 55238451Smsmith 553223488Srodrigcstatic off_t 554221358Srodrigctftp_seek(struct open_file *f, off_t offset, int where) 55538451Smsmith{ 55638451Smsmith struct tftp_handle *tftpfile; 55738451Smsmith tftpfile = (struct tftp_handle *) f->f_fsdata; 55838451Smsmith 55938451Smsmith switch (where) { 56038451Smsmith case SEEK_SET: 56138451Smsmith tftpfile->off = offset; 56238451Smsmith break; 56338451Smsmith case SEEK_CUR: 56438451Smsmith tftpfile->off += offset; 56538451Smsmith break; 56638451Smsmith default: 56738451Smsmith errno = EOFFSET; 56838451Smsmith return (-1); 56938451Smsmith } 57038451Smsmith return (tftpfile->off); 57138451Smsmith} 572223122Srodrigc 573223122Srodrigcstatic ssize_t 574223488Srodrigcsendrecv_tftp(struct tftp_handle *h, 575223124Srodrigc ssize_t (*sproc)(struct iodesc *, void *, size_t), 576223124Srodrigc void *sbuf, size_t ssize, 577223124Srodrigc ssize_t (*rproc)(struct tftp_handle *, void *, ssize_t, time_t, unsigned short *), 578223124Srodrigc void *rbuf, size_t rsize, unsigned short *rtype) 579223122Srodrigc{ 580223124Srodrigc struct iodesc *d = h->iodesc; 581223122Srodrigc ssize_t cc; 582223122Srodrigc time_t t, t1, tleft; 583223122Srodrigc 584223122Srodrigc#ifdef TFTP_DEBUG 585223122Srodrigc if (debug) 586223122Srodrigc printf("sendrecv: called\n"); 587223122Srodrigc#endif 588223122Srodrigc 589223122Srodrigc tleft = MINTMO; 590223122Srodrigc t = t1 = getsecs(); 591223122Srodrigc for (;;) { 592223122Srodrigc if ((getsecs() - t) > MAXTMO) { 593223122Srodrigc errno = ETIMEDOUT; 594223122Srodrigc return -1; 595223122Srodrigc } 596223122Srodrigc 597223122Srodrigc cc = (*sproc)(d, sbuf, ssize); 598223122Srodrigc if (cc != -1 && cc < ssize) 599223122Srodrigc panic("sendrecv: short write! (%zd < %zu)", 600223122Srodrigc cc, ssize); 601223122Srodrigc 602223122Srodrigc if (cc == -1) { 603223122Srodrigc /* Error on transmit; wait before retrying */ 604223122Srodrigc while ((getsecs() - t1) < tleft); 605223122Srodrigc continue; 606223122Srodrigc } 607223122Srodrigc 608223123Srodrigcrecvnext: 609223122Srodrigc /* Try to get a packet and process it. */ 610223124Srodrigc cc = (*rproc)(h, rbuf, rsize, tleft, rtype); 611223122Srodrigc /* Return on data, EOF or real error. */ 612223122Srodrigc if (cc != -1 || errno != 0) 613223122Srodrigc return (cc); 614223123Srodrigc if ((getsecs() - t1) < tleft) { 615223123Srodrigc goto recvnext; 616223123Srodrigc } 617223122Srodrigc 618223122Srodrigc /* Timed out or didn't get the packet we're waiting for */ 619223122Srodrigc tleft += MINTMO; 620223122Srodrigc if (tleft > (2 * MINTMO)) { 621223122Srodrigc tleft = (2 * MINTMO); 622223122Srodrigc } 623223122Srodrigc t1 = getsecs(); 624223122Srodrigc } 625223122Srodrigc} 626223124Srodrigc 627223124Srodrigcstatic int 628223124Srodrigctftp_set_blksize(struct tftp_handle *h, const char *str) 629223124Srodrigc{ 630223124Srodrigc char *endptr; 631223124Srodrigc int new_blksize; 632223124Srodrigc int ret = 0; 633223124Srodrigc 634223124Srodrigc if (h == NULL || str == NULL) 635223124Srodrigc return (ret); 636223124Srodrigc 637223124Srodrigc new_blksize = 638223124Srodrigc (unsigned int)strtol(str, &endptr, 0); 639223124Srodrigc 640223124Srodrigc /* 641223124Srodrigc * Only accept blksize value if it is numeric. 642223488Srodrigc * RFC2348 specifies that acceptable values are 8-65464. 643223488Srodrigc * Let's choose a limit less than MAXRSPACE. 644223488Srodrigc */ 645223124Srodrigc if (*endptr == '\0' && new_blksize >= 8 646223124Srodrigc && new_blksize <= TFTP_MAX_BLKSIZE) { 647223124Srodrigc h->tftp_blksize = new_blksize; 648223124Srodrigc ret = 1; 649223124Srodrigc } 650223124Srodrigc 651223124Srodrigc return (ret); 652223124Srodrigc} 653223124Srodrigc 654223124Srodrigc/* 655223124Srodrigc * In RFC2347, the TFTP Option Acknowledgement package (OACK) 656223124Srodrigc * is used to acknowledge a client's option negotiation request. 657223124Srodrigc * The format of an OACK packet is: 658223124Srodrigc * +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+ 659223124Srodrigc * | opc | opt1 | 0 | value1 | 0 | optN | 0 | valueN | 0 | 660223124Srodrigc * +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+ 661223124Srodrigc * 662223124Srodrigc * opc 663223124Srodrigc * The opcode field contains a 6, for Option Acknowledgment. 664223124Srodrigc * 665223124Srodrigc * opt1 666223124Srodrigc * The first option acknowledgment, copied from the original 667223124Srodrigc * request. 668223124Srodrigc * 669223124Srodrigc * value1 670223124Srodrigc * The acknowledged value associated with the first option. If 671223124Srodrigc * and how this value may differ from the original request is 672223124Srodrigc * detailed in the specification for the option. 673223124Srodrigc * 674223124Srodrigc * optN, valueN 675223124Srodrigc * The final option/value acknowledgment pair. 676223124Srodrigc */ 677223488Srodrigcstatic int 678223124Srodrigctftp_parse_oack(struct tftp_handle *h, char *buf, size_t len) 679223124Srodrigc{ 680223124Srodrigc /* 681223124Srodrigc * We parse the OACK strings into an array 682223124Srodrigc * of name-value pairs. 683223124Srodrigc */ 684223124Srodrigc char *tftp_options[128] = { 0 }; 685223124Srodrigc char *val = buf; 686223124Srodrigc int i = 0; 687223124Srodrigc int option_idx = 0; 688223124Srodrigc int blksize_is_set = 0; 689223124Srodrigc int tsize = 0; 690223124Srodrigc 691223488Srodrigc unsigned int orig_blksize; 692223488Srodrigc 693223488Srodrigc while (option_idx < 128 && i < len) { 694223488Srodrigc if (buf[i] == '\0') { 695223488Srodrigc if (&buf[i] > val) { 696223488Srodrigc tftp_options[option_idx] = val; 697223488Srodrigc val = &buf[i] + 1; 698223488Srodrigc ++option_idx; 699223488Srodrigc } 700223488Srodrigc } 701223488Srodrigc ++i; 702223124Srodrigc } 703223124Srodrigc 704223488Srodrigc /* Save the block size we requested for sanity check later. */ 705223488Srodrigc orig_blksize = h->tftp_blksize; 706223488Srodrigc 707223124Srodrigc /* 708223124Srodrigc * Parse individual TFTP options. 709223124Srodrigc * * "blksize" is specified in RFC2348. 710223124Srodrigc * * "tsize" is specified in RFC2349. 711223124Srodrigc */ 712223124Srodrigc for (i = 0; i < option_idx; i += 2) { 713223124Srodrigc if (strcasecmp(tftp_options[i], "blksize") == 0) { 714223488Srodrigc if (i + 1 < option_idx) 715223124Srodrigc blksize_is_set = 716223124Srodrigc tftp_set_blksize(h, tftp_options[i + 1]); 717223124Srodrigc } else if (strcasecmp(tftp_options[i], "tsize") == 0) { 718223488Srodrigc if (i + 1 < option_idx) 719223124Srodrigc tsize = strtol(tftp_options[i + 1], (char **)NULL, 10); 720223488Srodrigc } else { 721223488Srodrigc /* Do not allow any options we did not expect to be ACKed. */ 722223488Srodrigc printf("unexpected tftp option '%s'\n", tftp_options[i]); 723223488Srodrigc return (-1); 724223124Srodrigc } 725223124Srodrigc } 726223124Srodrigc 727223124Srodrigc if (!blksize_is_set) { 728223124Srodrigc /* 729223124Srodrigc * If TFTP blksize was not set, try defaulting 730223488Srodrigc * to the legacy TFTP blksize of SEGSIZE(512) 731223124Srodrigc */ 732223488Srodrigc h->tftp_blksize = SEGSIZE; 733223488Srodrigc } else if (h->tftp_blksize > orig_blksize) { 734223488Srodrigc /* 735223488Srodrigc * Server should not be proposing block sizes that 736223488Srodrigc * exceed what we said we can handle. 737223488Srodrigc */ 738223488Srodrigc printf("unexpected blksize %u\n", h->tftp_blksize); 739223488Srodrigc return (-1); 740223124Srodrigc } 741223124Srodrigc 742223124Srodrigc#ifdef TFTP_DEBUG 743223124Srodrigc printf("tftp_blksize: %u\n", h->tftp_blksize); 744223124Srodrigc printf("tftp_tsize: %lu\n", h->tftp_tsize); 745223124Srodrigc#endif 746223488Srodrigc return 0; 747223124Srodrigc} 748