124 lines
4.1 KiB
Diff
124 lines
4.1 KiB
Diff
From e070dc7276c7958c322ca0fbf5ac10e639502b4d Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= <hpoussin@reactos.org>
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Date: Thu, 13 Sep 2012 07:55:01 +0200
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Subject: [PATCH] slirp: Implement TFTP Blocksize option
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This option is described in RFC 1783. As this is only an optional field,
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we may ignore it in some situations and handle it in some others.
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However, MS Windows 2003 PXE boot client requests a block size of the MTU
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(most of the times 1472 bytes), and doesn't work if the option is not
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acknowledged (with whatever value).
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According to the RFC 1783, we cannot acknowledge the option with a bigger
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value than the requested one.
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As current implementation is using 512 bytes by block, accept the option
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with a value of 512 if the option was specified, and don't acknowledge it
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if it is not present or less than 512 bytes.
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Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
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Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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(cherry picked from commit 95b1ad7ad86793c27ab8e9987be69571937900d1)
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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slirp/tftp.c | 42 +++++++++++++++++++++++++++++++++---------
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1 file changed, 33 insertions(+), 9 deletions(-)
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diff --git a/slirp/tftp.c b/slirp/tftp.c
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index c6a5df2..37b0387 100644
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--- a/slirp/tftp.c
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+++ b/slirp/tftp.c
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@@ -120,13 +120,13 @@ static int tftp_read_data(struct tftp_session *spt, uint32_t block_nr,
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}
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static int tftp_send_oack(struct tftp_session *spt,
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- const char *key, uint32_t value,
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+ const char *keys[], uint32_t values[], int nb,
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struct tftp_t *recv_tp)
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{
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struct sockaddr_in saddr, daddr;
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struct mbuf *m;
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struct tftp_t *tp;
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- int n = 0;
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+ int i, n = 0;
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m = m_get(spt->slirp);
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@@ -140,10 +140,12 @@ static int tftp_send_oack(struct tftp_session *spt,
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m->m_data += sizeof(struct udpiphdr);
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tp->tp_op = htons(TFTP_OACK);
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- n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
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- key) + 1;
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- n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
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- value) + 1;
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+ for (i = 0; i < nb; i++) {
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+ n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
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+ keys[i]) + 1;
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+ n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
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+ values[i]) + 1;
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+ }
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saddr.sin_addr = recv_tp->ip.ip_dst;
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saddr.sin_port = recv_tp->udp.uh_dport;
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@@ -260,6 +262,9 @@ static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
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int s, k;
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size_t prefix_len;
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char *req_fname;
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+ const char *option_name[2];
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+ uint32_t option_value[2];
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+ int nb_options = 0;
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/* check if a session already exists and if so terminate it */
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s = tftp_session_find(slirp, tp);
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@@ -337,7 +342,7 @@ static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
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return;
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}
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- while (k < pktlen) {
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+ while (k < pktlen && nb_options < ARRAY_SIZE(option_name)) {
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const char *key, *value;
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key = &tp->x.tp_buf[k];
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@@ -364,11 +369,30 @@ static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
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}
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}
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- tftp_send_oack(spt, "tsize", tsize, tp);
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- return;
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+ option_name[nb_options] = "tsize";
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+ option_value[nb_options] = tsize;
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+ nb_options++;
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+ } else if (strcasecmp(key, "blksize") == 0) {
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+ int blksize = atoi(value);
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+
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+ /* If blksize option is bigger than what we will
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+ * emit, accept the option with our packet size.
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+ * Otherwise, simply do as we didn't see the option.
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+ */
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+ if (blksize >= 512) {
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+ option_name[nb_options] = "blksize";
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+ option_value[nb_options] = 512;
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+ nb_options++;
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+ }
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}
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}
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+ if (nb_options > 0) {
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+ assert(nb_options <= ARRAY_SIZE(option_name));
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+ tftp_send_oack(spt, option_name, option_value, nb_options, tp);
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+ return;
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+ }
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+
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spt->block_nr = 0;
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tftp_send_next_block(spt, tp);
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}
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--
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1.7.12.1
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