TFTP support (Magnus Damm)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1050 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard
parent
60e336dbb8
commit
c7f746434f
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@ -8,6 +8,7 @@ version 0.6.1:
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transparent decompression
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- VMware 3 and 4 read-only disk image support (untested)
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- Support for up to 4 serial ports
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- TFTP server support (Magnus Damm)
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version 0.6.0:
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@ -264,7 +264,7 @@ ifdef CONFIG_SLIRP
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DEFINES+=-I$(SRC_PATH)/slirp
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SLIRP_OBJS=cksum.o if.o ip_icmp.o ip_input.o ip_output.o \
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slirp.o mbuf.o misc.o sbuf.o socket.o tcp_input.o tcp_output.o \
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tcp_subr.o tcp_timer.o udp.o bootp.o debug.o
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tcp_subr.o tcp_timer.o udp.o bootp.o debug.o tftp.o
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VL_OBJS+=$(addprefix slirp/, $(SLIRP_OBJS))
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endif
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@ -210,6 +210,7 @@ int inet_aton _P((const char *cp, struct in_addr *ia));
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#endif
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#include "bootp.h"
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#include "tftp.h"
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#include "libslirp.h"
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extern struct ttys *ttys_unit[MAX_INTERFACES];
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@ -0,0 +1,339 @@
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/*
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* tftp.c - a simple, read-only tftp server for qemu
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*
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* Copyright (c) 2004 Magnus Damm <damm@opensource.se>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <slirp.h>
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struct tftp_session {
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int in_use;
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unsigned char filename[TFTP_FILENAME_MAX];
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struct in_addr client_ip;
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u_int16_t client_port;
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struct timeval timestamp;
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};
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struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
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char *tftp_prefix;
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static void tftp_session_update(struct tftp_session *spt)
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{
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gettimeofday(&spt->timestamp, 0);
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spt->in_use = 1;
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}
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static void tftp_session_terminate(struct tftp_session *spt)
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{
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spt->in_use = 0;
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}
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static int tftp_session_allocate(struct tftp_t *tp)
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{
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struct tftp_session *spt;
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struct timeval tv;
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int k;
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gettimeofday(&tv, 0);
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for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
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spt = &tftp_sessions[k];
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if (!spt->in_use) {
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goto found;
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}
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/* sessions time out after 5 inactive seconds */
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if (tv.tv_sec > (spt->timestamp.tv_sec + 5)) {
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goto found;
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}
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}
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return -1;
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found:
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memset(spt, 0, sizeof(*spt));
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memcpy(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip));
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spt->client_port = tp->udp.uh_sport;
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tftp_session_update(spt);
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return k;
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}
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static int tftp_session_find(struct tftp_t *tp)
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{
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struct tftp_session *spt;
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int k;
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for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
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spt = &tftp_sessions[k];
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if (spt->in_use) {
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if (!memcmp(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip))) {
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if (spt->client_port == tp->udp.uh_sport) {
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return k;
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}
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}
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}
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}
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return -1;
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}
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static int tftp_read_data(struct tftp_session *spt, u_int16_t block_nr,
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u_int8_t *buf, int len)
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{
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int fd;
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int bytes_read = 0;
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fd = open(spt->filename, O_RDONLY);
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if (fd < 0) {
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return -1;
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}
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if (len) {
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lseek(fd, block_nr * 512, SEEK_SET);
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bytes_read = read(fd, buf, len);
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}
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close(fd);
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return bytes_read;
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}
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static int tftp_send_error(struct tftp_session *spt,
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u_int16_t errorcode, const char *msg,
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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 nobytes;
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m = m_get();
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if (!m) {
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return -1;
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}
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memset(m->m_data, 0, m->m_size);
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m->m_data += if_maxlinkhdr;
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tp = (void *)m->m_data;
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m->m_data += sizeof(struct udpiphdr);
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tp->tp_op = htons(TFTP_ERROR);
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tp->x.tp_error.tp_error_code = htons(errorcode);
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strcpy(tp->x.tp_error.tp_msg, msg);
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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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daddr.sin_addr = spt->client_ip;
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daddr.sin_port = spt->client_port;
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nobytes = 2;
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m->m_len = sizeof(struct tftp_t) - 514 + 3 + strlen(msg) -
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sizeof(struct ip) - sizeof(struct udphdr);
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udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
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tftp_session_terminate(spt);
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return 0;
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}
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static int tftp_send_data(struct tftp_session *spt,
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u_int16_t block_nr,
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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 nobytes;
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if (block_nr < 1) {
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return -1;
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}
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m = m_get();
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if (!m) {
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return -1;
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}
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memset(m->m_data, 0, m->m_size);
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m->m_data += if_maxlinkhdr;
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tp = (void *)m->m_data;
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m->m_data += sizeof(struct udpiphdr);
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tp->tp_op = htons(TFTP_DATA);
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tp->x.tp_data.tp_block_nr = htons(block_nr);
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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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daddr.sin_addr = spt->client_ip;
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daddr.sin_port = spt->client_port;
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nobytes = tftp_read_data(spt, block_nr - 1, tp->x.tp_data.tp_buf, 512);
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if (nobytes < 0) {
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m_free(m);
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/* send "file not found" error back */
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tftp_send_error(spt, 1, "File not found", tp);
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return -1;
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}
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m->m_len = sizeof(struct tftp_t) - (512 - nobytes) -
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sizeof(struct ip) - sizeof(struct udphdr);
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udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
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if (nobytes == 512) {
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tftp_session_update(spt);
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}
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else {
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tftp_session_terminate(spt);
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}
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return 0;
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}
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static void tftp_handle_rrq(struct tftp_t *tp, int pktlen)
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{
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struct tftp_session *spt;
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int s, k, n;
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u_int8_t *src, *dst;
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s = tftp_session_allocate(tp);
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if (s < 0) {
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return;
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}
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spt = &tftp_sessions[s];
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src = tp->x.tp_buf;
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dst = spt->filename;
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n = pktlen - ((uint8_t *)&tp->x.tp_buf[0] - (uint8_t *)tp);
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/* get name */
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for (k = 0; k < n; k++) {
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if (k < TFTP_FILENAME_MAX) {
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dst[k] = src[k];
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}
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else {
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return;
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}
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if (src[k] == '\0') {
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break;
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}
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}
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if (k >= n) {
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return;
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}
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k++;
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/* check mode */
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if ((n - k) < 6) {
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return;
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}
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if (memcmp(&src[k], "octet\0", 6) != 0) {
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tftp_send_error(spt, 4, "Unsupported transfer mode", tp);
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return;
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}
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/* do sanity checks on the filename */
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if ((spt->filename[0] != '/')
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|| (spt->filename[strlen(spt->filename) - 1] == '/')
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|| strstr(spt->filename, "/../")) {
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tftp_send_error(spt, 2, "Access violation", tp);
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return;
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}
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/* only allow exported prefixes */
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if (!tftp_prefix
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|| (strncmp(spt->filename, tftp_prefix, strlen(tftp_prefix)) != 0)) {
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tftp_send_error(spt, 2, "Access violation", tp);
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return;
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}
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/* check if the file exists */
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if (tftp_read_data(spt, 0, spt->filename, 0) < 0) {
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tftp_send_error(spt, 1, "File not found", tp);
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return;
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}
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tftp_send_data(spt, 1, tp);
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}
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static void tftp_handle_ack(struct tftp_t *tp, int pktlen)
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{
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int s;
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s = tftp_session_find(tp);
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if (s < 0) {
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return;
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}
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if (tftp_send_data(&tftp_sessions[s],
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ntohs(tp->x.tp_data.tp_block_nr) + 1,
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tp) < 0) {
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return;
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}
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}
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void tftp_input(struct mbuf *m)
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{
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struct tftp_t *tp = (struct tftp_t *)m->m_data;
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switch(ntohs(tp->tp_op)) {
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case TFTP_RRQ:
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tftp_handle_rrq(tp, m->m_len);
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break;
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case TFTP_ACK:
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tftp_handle_ack(tp, m->m_len);
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break;
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}
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}
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@ -0,0 +1,34 @@
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/* tftp defines */
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#define TFTP_SESSIONS_MAX 3
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#define TFTP_SERVER 69
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#define TFTP_RRQ 1
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#define TFTP_WRQ 2
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#define TFTP_DATA 3
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#define TFTP_ACK 4
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#define TFTP_ERROR 5
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#define TFTP_FILENAME_MAX 512
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struct tftp_t {
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struct ip ip;
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struct udphdr udp;
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u_int16_t tp_op;
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union {
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struct {
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u_int16_t tp_block_nr;
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u_int8_t tp_buf[512];
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} tp_data;
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struct {
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u_int16_t tp_error_code;
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u_int8_t tp_msg[512];
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} tp_error;
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u_int8_t tp_buf[512 + 2];
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} x;
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};
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extern char *tftp_prefix;
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void tftp_input(struct mbuf *m);
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@ -153,6 +153,14 @@ udp_input(m, iphlen)
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goto bad;
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}
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/*
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* handle TFTP
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*/
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if (ntohs(uh->uh_dport) == TFTP_SERVER) {
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tftp_input(m);
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goto bad;
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}
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/*
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* Locate pcb for datagram.
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*/
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11
vl.c
11
vl.c
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@ -2334,6 +2334,7 @@ void help(void)
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"-tun-fd fd use this fd as already opened tap/tun interface\n"
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#ifdef CONFIG_SLIRP
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"-user-net use user mode network stack [default if no tap/tun script]\n"
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"-tftp prefix allow tftp access to files starting with prefix [only with -user-net enabled]\n"
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#endif
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"-dummy-net use dummy network stack\n"
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"\n"
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@ -2408,6 +2409,7 @@ enum {
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QEMU_OPTION_n,
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QEMU_OPTION_tun_fd,
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QEMU_OPTION_user_net,
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QEMU_OPTION_tftp,
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QEMU_OPTION_dummy_net,
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QEMU_OPTION_kernel,
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@ -2460,6 +2462,7 @@ const QEMUOption qemu_options[] = {
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{ "tun-fd", HAS_ARG, QEMU_OPTION_tun_fd },
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#ifdef CONFIG_SLIRP
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{ "user-net", 0, QEMU_OPTION_user_net },
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{ "tftp", HAS_ARG, QEMU_OPTION_tftp },
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#endif
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{ "dummy-net", 0, QEMU_OPTION_dummy_net },
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@ -2751,9 +2754,17 @@ int main(int argc, char **argv)
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}
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}
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break;
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#ifdef CONFIG_SLIRP
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case QEMU_OPTION_tftp:
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{
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extern const char *tftp_prefix;
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tftp_prefix = optarg;
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}
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break;
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case QEMU_OPTION_user_net:
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net_if_type = NET_IF_USER;
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break;
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#endif
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case QEMU_OPTION_dummy_net:
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net_if_type = NET_IF_DUMMY;
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break;
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