Commit c7f74643 authored by bellard's avatar bellard
Browse files

TFTP support (Magnus Damm)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1050 c046a42c-6fe2-441c-8c8c-71466251a162
parent 60e336db
......@@ -8,6 +8,7 @@ version 0.6.1:
transparent decompression
- VMware 3 and 4 read-only disk image support (untested)
- Support for up to 4 serial ports
- TFTP server support (Magnus Damm)
version 0.6.0:
......
......@@ -264,7 +264,7 @@ ifdef CONFIG_SLIRP
DEFINES+=-I$(SRC_PATH)/slirp
SLIRP_OBJS=cksum.o if.o ip_icmp.o ip_input.o ip_output.o \
slirp.o mbuf.o misc.o sbuf.o socket.o tcp_input.o tcp_output.o \
tcp_subr.o tcp_timer.o udp.o bootp.o debug.o
tcp_subr.o tcp_timer.o udp.o bootp.o debug.o tftp.o
VL_OBJS+=$(addprefix slirp/, $(SLIRP_OBJS))
endif
......
......@@ -210,6 +210,7 @@ int inet_aton _P((const char *cp, struct in_addr *ia));
#endif
#include "bootp.h"
#include "tftp.h"
#include "libslirp.h"
extern struct ttys *ttys_unit[MAX_INTERFACES];
......
/*
* tftp.c - a simple, read-only tftp server for qemu
*
* Copyright (c) 2004 Magnus Damm <damm@opensource.se>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <slirp.h>
struct tftp_session {
int in_use;
unsigned char filename[TFTP_FILENAME_MAX];
struct in_addr client_ip;
u_int16_t client_port;
struct timeval timestamp;
};
struct tftp_session tftp_sessions[TFTP_SESSIONS_MAX];
char *tftp_prefix;
static void tftp_session_update(struct tftp_session *spt)
{
gettimeofday(&spt->timestamp, 0);
spt->in_use = 1;
}
static void tftp_session_terminate(struct tftp_session *spt)
{
spt->in_use = 0;
}
static int tftp_session_allocate(struct tftp_t *tp)
{
struct tftp_session *spt;
struct timeval tv;
int k;
gettimeofday(&tv, 0);
for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
spt = &tftp_sessions[k];
if (!spt->in_use) {
goto found;
}
/* sessions time out after 5 inactive seconds */
if (tv.tv_sec > (spt->timestamp.tv_sec + 5)) {
goto found;
}
}
return -1;
found:
memset(spt, 0, sizeof(*spt));
memcpy(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip));
spt->client_port = tp->udp.uh_sport;
tftp_session_update(spt);
return k;
}
static int tftp_session_find(struct tftp_t *tp)
{
struct tftp_session *spt;
int k;
for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
spt = &tftp_sessions[k];
if (spt->in_use) {
if (!memcmp(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip))) {
if (spt->client_port == tp->udp.uh_sport) {
return k;
}
}
}
}
return -1;
}
static int tftp_read_data(struct tftp_session *spt, u_int16_t block_nr,
u_int8_t *buf, int len)
{
int fd;
int bytes_read = 0;
fd = open(spt->filename, O_RDONLY);
if (fd < 0) {
return -1;
}
if (len) {
lseek(fd, block_nr * 512, SEEK_SET);
bytes_read = read(fd, buf, len);
}
close(fd);
return bytes_read;
}
static int tftp_send_error(struct tftp_session *spt,
u_int16_t errorcode, const char *msg,
struct tftp_t *recv_tp)
{
struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
int nobytes;
m = m_get();
if (!m) {
return -1;
}
memset(m->m_data, 0, m->m_size);
m->m_data += if_maxlinkhdr;
tp = (void *)m->m_data;
m->m_data += sizeof(struct udpiphdr);
tp->tp_op = htons(TFTP_ERROR);
tp->x.tp_error.tp_error_code = htons(errorcode);
strcpy(tp->x.tp_error.tp_msg, msg);
saddr.sin_addr = recv_tp->ip.ip_dst;
saddr.sin_port = recv_tp->udp.uh_dport;
daddr.sin_addr = spt->client_ip;
daddr.sin_port = spt->client_port;
nobytes = 2;
m->m_len = sizeof(struct tftp_t) - 514 + 3 + strlen(msg) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
tftp_session_terminate(spt);
return 0;
}
static int tftp_send_data(struct tftp_session *spt,
u_int16_t block_nr,
struct tftp_t *recv_tp)
{
struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
int nobytes;
if (block_nr < 1) {
return -1;
}
m = m_get();
if (!m) {
return -1;
}
memset(m->m_data, 0, m->m_size);
m->m_data += if_maxlinkhdr;
tp = (void *)m->m_data;
m->m_data += sizeof(struct udpiphdr);
tp->tp_op = htons(TFTP_DATA);
tp->x.tp_data.tp_block_nr = htons(block_nr);
saddr.sin_addr = recv_tp->ip.ip_dst;
saddr.sin_port = recv_tp->udp.uh_dport;
daddr.sin_addr = spt->client_ip;
daddr.sin_port = spt->client_port;
nobytes = tftp_read_data(spt, block_nr - 1, tp->x.tp_data.tp_buf, 512);
if (nobytes < 0) {
m_free(m);
/* send "file not found" error back */
tftp_send_error(spt, 1, "File not found", tp);
return -1;
}
m->m_len = sizeof(struct tftp_t) - (512 - nobytes) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
if (nobytes == 512) {
tftp_session_update(spt);
}
else {
tftp_session_terminate(spt);
}
return 0;
}
static void tftp_handle_rrq(struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
int s, k, n;
u_int8_t *src, *dst;
s = tftp_session_allocate(tp);
if (s < 0) {
return;
}
spt = &tftp_sessions[s];
src = tp->x.tp_buf;
dst = spt->filename;
n = pktlen - ((uint8_t *)&tp->x.tp_buf[0] - (uint8_t *)tp);
/* get name */
for (k = 0; k < n; k++) {
if (k < TFTP_FILENAME_MAX) {
dst[k] = src[k];
}
else {
return;
}
if (src[k] == '\0') {
break;
}
}
if (k >= n) {
return;
}
k++;
/* check mode */
if ((n - k) < 6) {
return;
}
if (memcmp(&src[k], "octet\0", 6) != 0) {
tftp_send_error(spt, 4, "Unsupported transfer mode", tp);
return;
}
/* do sanity checks on the filename */
if ((spt->filename[0] != '/')
|| (spt->filename[strlen(spt->filename) - 1] == '/')
|| strstr(spt->filename, "/../")) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
/* only allow exported prefixes */
if (!tftp_prefix
|| (strncmp(spt->filename, tftp_prefix, strlen(tftp_prefix)) != 0)) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
/* check if the file exists */
if (tftp_read_data(spt, 0, spt->filename, 0) < 0) {
tftp_send_error(spt, 1, "File not found", tp);
return;
}
tftp_send_data(spt, 1, tp);
}
static void tftp_handle_ack(struct tftp_t *tp, int pktlen)
{
int s;
s = tftp_session_find(tp);
if (s < 0) {
return;
}
if (tftp_send_data(&tftp_sessions[s],
ntohs(tp->x.tp_data.tp_block_nr) + 1,
tp) < 0) {
return;
}
}
void tftp_input(struct mbuf *m)
{
struct tftp_t *tp = (struct tftp_t *)m->m_data;
switch(ntohs(tp->tp_op)) {
case TFTP_RRQ:
tftp_handle_rrq(tp, m->m_len);
break;
case TFTP_ACK:
tftp_handle_ack(tp, m->m_len);
break;
}
}
/* tftp defines */
#define TFTP_SESSIONS_MAX 3
#define TFTP_SERVER 69
#define TFTP_RRQ 1
#define TFTP_WRQ 2
#define TFTP_DATA 3
#define TFTP_ACK 4
#define TFTP_ERROR 5
#define TFTP_FILENAME_MAX 512
struct tftp_t {
struct ip ip;
struct udphdr udp;
u_int16_t tp_op;
union {
struct {
u_int16_t tp_block_nr;
u_int8_t tp_buf[512];
} tp_data;
struct {
u_int16_t tp_error_code;
u_int8_t tp_msg[512];
} tp_error;
u_int8_t tp_buf[512 + 2];
} x;
};
extern char *tftp_prefix;
void tftp_input(struct mbuf *m);
......@@ -153,6 +153,14 @@ udp_input(m, iphlen)
goto bad;
}
/*
* handle TFTP
*/
if (ntohs(uh->uh_dport) == TFTP_SERVER) {
tftp_input(m);
goto bad;
}
/*
* Locate pcb for datagram.
*/
......
......@@ -2334,6 +2334,7 @@ void help(void)
"-tun-fd fd use this fd as already opened tap/tun interface\n"
#ifdef CONFIG_SLIRP
"-user-net use user mode network stack [default if no tap/tun script]\n"
"-tftp prefix allow tftp access to files starting with prefix [only with -user-net enabled]\n"
#endif
"-dummy-net use dummy network stack\n"
"\n"
......@@ -2408,6 +2409,7 @@ enum {
QEMU_OPTION_n,
QEMU_OPTION_tun_fd,
QEMU_OPTION_user_net,
QEMU_OPTION_tftp,
QEMU_OPTION_dummy_net,
QEMU_OPTION_kernel,
......@@ -2460,6 +2462,7 @@ const QEMUOption qemu_options[] = {
{ "tun-fd", HAS_ARG, QEMU_OPTION_tun_fd },
#ifdef CONFIG_SLIRP
{ "user-net", 0, QEMU_OPTION_user_net },
{ "tftp", HAS_ARG, QEMU_OPTION_tftp },
#endif
{ "dummy-net", 0, QEMU_OPTION_dummy_net },
......@@ -2751,9 +2754,17 @@ int main(int argc, char **argv)
}
}
break;
#ifdef CONFIG_SLIRP
case QEMU_OPTION_tftp:
{
extern const char *tftp_prefix;
tftp_prefix = optarg;
}
break;
case QEMU_OPTION_user_net:
net_if_type = NET_IF_USER;
break;
#endif
case QEMU_OPTION_dummy_net:
net_if_type = NET_IF_DUMMY;
break;
......
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