RFC2349 (http://www.hypermail.org/rfcs/rfc2349.html) adds support
for negotiation of timeout and file size to the tftp protocol. This is required by some firmware like EFI boot managers (at least on HP i2000 Itanium servers) in order to boot an image using tftp. The attached patch implements the RFC, and in doing so also implements RFC2347; a generic tftp option extension. PR: 30710 Submitted by: Espen Skoglund <esk@ira.uka.de>
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=84047
@ -50,6 +50,7 @@
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#define DATA 03 /* data packet */
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#define ACK 04 /* acknowledgement */
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#define ERROR 05 /* error code */
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#define OACK 06 /* option acknowledgement */
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struct tftphdr {
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unsigned short th_opcode; /* packet type */
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@ -77,5 +78,6 @@ struct tftphdr {
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#define EBADID 5 /* unknown transfer ID */
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#define EEXISTS 6 /* file already exists */
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#define ENOUSER 7 /* no such user */
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#define EOPTNEG 8 /* option negotiation failed */
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#endif /* !_TFTP_H_ */
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@ -79,10 +79,11 @@ static const char rcsid[] =
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#include "tftpsubs.h"
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#define TIMEOUT 5
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#define MAX_TIMEOUTS 5
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int peer;
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int rexmtval = TIMEOUT;
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int maxtimeout = 5*TIMEOUT;
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int max_rexmtval = 2*TIMEOUT;
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#define PKTSIZE SEGSIZE+4
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char buf[PKTSIZE];
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@ -110,6 +111,7 @@ static int ipchroot;
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static char *errtomsg __P((int));
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static void nak __P((int));
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static void oack __P(());
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int
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main(argc, argv)
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@ -311,6 +313,21 @@ struct formats {
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{ 0 }
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};
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struct options {
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char *o_type;
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char *o_request;
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int o_reply; /* turn into union if need be */
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} options[] = {
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{ "tsize" }, /* OPT_TSIZE */
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{ "timeout" }, /* OPT_TIMEOUT */
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{ NULL }
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};
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enum opt_enum {
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OPT_TSIZE = 0,
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OPT_TIMEOUT,
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};
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/*
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* Handle initial connection protocol.
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*/
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@ -320,9 +337,9 @@ tftp(tp, size)
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int size;
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{
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register char *cp;
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int first = 1, ecode;
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int i, first = 1, has_options = 0, ecode;
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register struct formats *pf;
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char *filename, *mode;
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char *filename, *mode, *option, *ccp;
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filename = cp = tp->th_stuff;
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again:
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@ -350,7 +367,40 @@ tftp(tp, size)
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nak(EBADOP);
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exit(1);
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}
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while (++cp < buf + size) {
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for (i = 2, ccp = cp; i > 0; ccp++) {
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if (ccp >= buf + size) {
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nak(EBADOP);
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exit(1);
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} else if (*ccp == '\0')
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i--;
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}
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for (option = cp; *cp; cp++)
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if (isupper(*cp))
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*cp = tolower(*cp);
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for (i = 0; options[i].o_type != NULL; i++)
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if (strcmp(option, options[i].o_type) == 0) {
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options[i].o_request = ++cp;
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has_options = 1;
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}
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cp = ccp-1;
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}
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if (options[OPT_TIMEOUT].o_request) {
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int to = atoi(options[OPT_TIMEOUT].o_request);
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if (to < 1 || to > 255) {
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nak(EBADOP);
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exit(1);
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}
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else if (to <= max_rexmtval)
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options[OPT_TIMEOUT].o_reply = rexmtval = to;
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else
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options[OPT_TIMEOUT].o_request = NULL;
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}
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ecode = (*pf->f_validate)(&filename, tp->th_opcode);
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if (has_options)
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oack();
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if (logging) {
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char host[MAXHOSTNAMELEN];
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@ -468,6 +518,14 @@ validate_access(filep, mode)
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return (err);
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*filep = filename = pathname;
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}
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if (options[OPT_TSIZE].o_request) {
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if (mode == RRQ)
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options[OPT_TSIZE].o_reply = stbuf.st_size;
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else
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/* XXX Allows writes of all sizes. */
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options[OPT_TSIZE].o_reply =
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atoi(options[OPT_TSIZE].o_request);
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}
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fd = open(filename, mode == RRQ ? O_RDONLY : O_WRONLY|O_TRUNC);
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if (fd < 0)
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return (errno + 100);
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@ -478,15 +536,13 @@ validate_access(filep, mode)
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return (0);
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}
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int timeout;
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int timeouts;
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jmp_buf timeoutbuf;
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void
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timer()
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{
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timeout += rexmtval;
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if (timeout >= maxtimeout)
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if (++timeouts > MAX_TIMEOUTS)
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exit(1);
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longjmp(timeoutbuf, 1);
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}
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@ -515,7 +571,7 @@ xmitfile(pf)
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}
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dp->th_opcode = htons((u_short)DATA);
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dp->th_block = htons((u_short)block);
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timeout = 0;
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timeouts = 0;
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(void)setjmp(timeoutbuf);
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send_data:
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@ -578,7 +634,7 @@ recvfile(pf)
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ap = (struct tftphdr *)ackbuf;
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block = 0;
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do {
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timeout = 0;
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timeouts = 0;
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ap->th_opcode = htons((u_short)ACK);
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ap->th_block = htons((u_short)block);
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block++;
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@ -651,6 +707,7 @@ struct errmsg {
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{ EBADID, "Unknown transfer ID" },
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{ EEXISTS, "File already exists" },
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{ ENOUSER, "No such user" },
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{ EOPTNEG, "Option negotiation" },
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{ -1, 0 }
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};
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@ -700,3 +757,57 @@ nak(error)
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if (send(peer, buf, length, 0) != length)
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syslog(LOG_ERR, "nak: %m");
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}
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/*
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* Send an oack packet (option acknowledgement).
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*/
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static void
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oack()
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{
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struct tftphdr *tp, *ap;
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int size, i, n;
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char *bp;
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tp = (struct tftphdr *)buf;
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bp = buf + 2;
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size = sizeof(buf) - 2;
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tp->th_opcode = htons((u_short)OACK);
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for (i = 0; options[i].o_type != NULL; i++) {
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if (options[i].o_request) {
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n = snprintf(bp, size, "%s%c%d", options[i].o_type,
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0, options[i].o_reply);
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bp += n+1;
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size -= n+1;
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if (size < 0) {
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syslog(LOG_ERR, "oack: buffer overflow");
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exit(1);
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}
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}
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}
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size = bp - buf;
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ap = (struct tftphdr *)ackbuf;
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signal(SIGALRM, timer);
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timeouts = 0;
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(void)setjmp(timeoutbuf);
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if (send(peer, buf, size, 0) != size) {
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syslog(LOG_INFO, "oack: %m");
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exit(1);
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}
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for (;;) {
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alarm(rexmtval);
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n = recv(peer, ackbuf, sizeof (ackbuf), 0);
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alarm(0);
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if (n < 0) {
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syslog(LOG_ERR, "recv: %m");
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exit(1);
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}
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ap->th_opcode = ntohs((u_short)ap->th_opcode);
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ap->th_block = ntohs((u_short)ap->th_block);
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if (ap->th_opcode == ERROR)
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exit(1);
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if (ap->th_opcode == ACK && ap->th_block == 0)
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break;
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}
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}
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