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Diffstat (limited to 'networking/tftp.c')
-rw-r--r--networking/tftp.c251
1 files changed, 103 insertions, 148 deletions
diff --git a/networking/tftp.c b/networking/tftp.c
index 2d28973..eaeb808 100644
--- a/networking/tftp.c
+++ b/networking/tftp.c
@@ -26,12 +26,6 @@
#define TFTP_TIMEOUT 5 /* seconds */
#define TFTP_NUM_RETRIES 5 /* number of retries */
-static const char * const MODE_OCTET = "octet";
-#define MODE_OCTET_LEN 6 /* sizeof(MODE_OCTET)*/
-
-static const char * const OPTION_BLOCKSIZE = "blksize";
-#define OPTION_BLOCKSIZE_LEN 8 /* sizeof(OPTION_BLOCKSIZE) */
-
/* opcodes we support */
#define TFTP_RRQ 1
#define TFTP_WRQ 2
@@ -51,13 +45,23 @@ static const char *const tftp_bb_error_msg[] = {
"No such user"
};
-#define tftp_cmd_get ENABLE_FEATURE_TFTP_GET
-
-#if ENABLE_FEATURE_TFTP_PUT
-# define tftp_cmd_put (tftp_cmd_get+ENABLE_FEATURE_TFTP_PUT)
+#if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
+#define USE_GETPUT(a)
+#define CMD_GET(cmd) 1
+#define CMD_PUT(cmd) 0
+#elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
+#define USE_GETPUT(a)
+#define CMD_GET(cmd) 0
+#define CMD_PUT(cmd) 1
#else
-# define tftp_cmd_put 0
+#define USE_GETPUT(a) a
+/* masks coming from getpot32 */
+#define CMD_GET(cmd) (cmd & 1)
+#define CMD_PUT(cmd) (cmd & 2)
#endif
+/* NB: in the code below
+ * CMD_GET(cmd) and CMD_GET(cmd) are mutually exclusive
+ */
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
@@ -70,8 +74,9 @@ static int tftp_blocksize_check(int blocksize, int bufsize)
* to use blocksizes smaller than 22 octets.
*/
- if ((bufsize && (blocksize > bufsize)) ||
- (blocksize < 8) || (blocksize > 65564)) {
+ if ((bufsize && (blocksize > bufsize))
+ || (blocksize < 8) || (blocksize > 65564)
+ ) {
bb_error_msg("bad blocksize");
return 0;
}
@@ -86,7 +91,6 @@ static char *tftp_option_get(char *buf, int len, const char * const option)
int k;
while (len > 0) {
-
/* Make sure the options are terminated correctly */
for (k = 0; k < len; k++) {
@@ -122,22 +126,23 @@ static char *tftp_option_get(char *buf, int len, const char * const option)
#endif
-static int tftp(const int cmd, const struct hostent *host,
- const char *remotefile, const int localfd,
- const unsigned short port, int tftp_bufsize)
+static int tftp(
+#if ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
+ const int cmd,
+#endif
+ const len_and_sockaddr *peer_lsa,
+ const char *remotefile, const int localfd,
+ const unsigned port, int tftp_bufsize)
{
- struct sockaddr_in sa;
- struct sockaddr_in from;
struct timeval tv;
- socklen_t fromlen;
fd_set rfds;
int socketfd;
int len;
int opcode = 0;
int finished = 0;
int timeout = TFTP_NUM_RETRIES;
- unsigned short block_nr = 1;
- unsigned short tmp;
+ uint16_t block_nr = 1;
+ uint16_t tmp;
char *cp;
USE_FEATURE_TFTP_BLOCKSIZE(int want_option_ack = 0;)
@@ -149,42 +154,24 @@ static int tftp(const int cmd, const struct hostent *host,
char *xbuf = xmalloc(tftp_bufsize += 4);
char *rbuf = xmalloc(tftp_bufsize);
- if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
- /* need to unlink the localfile, so don't use xsocket here. */
- bb_perror_msg("socket");
- return EXIT_FAILURE;
- }
-
- len = sizeof(sa);
-
- memset(&sa, 0, len);
- xbind(socketfd, (struct sockaddr *)&sa, len);
-
- sa.sin_family = host->h_addrtype;
- sa.sin_port = port;
- memcpy(&sa.sin_addr, (struct in_addr *) host->h_addr,
- sizeof(sa.sin_addr));
+ socketfd = xsocket(peer_lsa->sa.sa_family, SOCK_DGRAM, 0);
/* build opcode */
- if (cmd & tftp_cmd_get) {
+ opcode = TFTP_WRQ;
+ if (CMD_GET(cmd)) {
opcode = TFTP_RRQ;
}
- if (cmd & tftp_cmd_put) {
- opcode = TFTP_WRQ;
- }
while (1) {
cp = xbuf;
/* first create the opcode part */
- *((unsigned short *) cp) = htons(opcode);
+ *((uint16_t*)cp) = htons(opcode);
cp += 2;
/* add filename and mode */
- if (((cmd & tftp_cmd_get) && (opcode == TFTP_RRQ)) ||
- ((cmd & tftp_cmd_put) && (opcode == TFTP_WRQ)))
- {
+ if (CMD_GET(cmd) ? (opcode == TFTP_RRQ) : (opcode == TFTP_WRQ)) {
int too_long = 0;
/* see if the filename fits into xbuf
@@ -198,14 +185,14 @@ static int tftp(const int cmd, const struct hostent *host,
cp += len;
}
- if (too_long || ((&xbuf[tftp_bufsize - 1] - cp) < MODE_OCTET_LEN)) {
+ if (too_long || (&xbuf[tftp_bufsize - 1] - cp) < sizeof("octet")) {
bb_error_msg("remote filename too long");
break;
}
/* add "mode" part of the package */
- memcpy(cp, MODE_OCTET, MODE_OCTET_LEN);
- cp += MODE_OCTET_LEN;
+ memcpy(cp, "octet", sizeof("octet"));
+ cp += sizeof("octet");
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
@@ -219,8 +206,8 @@ static int tftp(const int cmd, const struct hostent *host,
}
/* add "blksize" + number of blocks */
- memcpy(cp, OPTION_BLOCKSIZE, OPTION_BLOCKSIZE_LEN);
- cp += OPTION_BLOCKSIZE_LEN;
+ memcpy(cp, "blksize", sizeof("blksize"));
+ cp += sizeof("blksize");
cp += snprintf(cp, 6, "%d", len) + 1;
want_option_ack = 1;
@@ -230,16 +217,12 @@ static int tftp(const int cmd, const struct hostent *host,
/* add ack and data */
- if (((cmd & tftp_cmd_get) && (opcode == TFTP_ACK)) ||
- ((cmd & tftp_cmd_put) && (opcode == TFTP_DATA))) {
-
- *((unsigned short *) cp) = htons(block_nr);
-
+ if (CMD_GET(cmd) ? (opcode == TFTP_ACK) : (opcode == TFTP_DATA)) {
+ *((uint16_t*)cp) = htons(block_nr);
cp += 2;
-
block_nr++;
- if ((cmd & tftp_cmd_put) && (opcode == TFTP_DATA)) {
+ if (CMD_PUT(cmd) && (opcode == TFTP_DATA)) {
len = full_read(localfd, cp, tftp_bufsize - 4);
if (len < 0) {
@@ -261,9 +244,7 @@ static int tftp(const int cmd, const struct hostent *host,
timeout = TFTP_NUM_RETRIES; /* re-initialize */
do {
-
len = cp - xbuf;
-
#if ENABLE_DEBUG_TFTP
fprintf(stderr, "sending %u bytes\n", len);
for (cp = xbuf; cp < &xbuf[len]; cp++)
@@ -271,7 +252,7 @@ static int tftp(const int cmd, const struct hostent *host,
fprintf(stderr, "\n");
#endif
if (sendto(socketfd, xbuf, len, 0,
- (struct sockaddr *) &sa, sizeof(sa)) < 0) {
+ &peer_lsa->sa, peer_lsa->len) < 0) {
bb_perror_msg("send");
len = -1;
break;
@@ -284,9 +265,6 @@ static int tftp(const int cmd, const struct hostent *host,
/* receive packet */
- memset(&from, 0, sizeof(from));
- fromlen = sizeof(from);
-
tv.tv_sec = TFTP_TIMEOUT;
tv.tv_usec = 0;
@@ -294,30 +272,41 @@ static int tftp(const int cmd, const struct hostent *host,
FD_SET(socketfd, &rfds);
switch (select(socketfd + 1, &rfds, NULL, NULL, &tv)) {
+ struct sockaddr *from;
+ socklen_t fromlen;
+
case 1:
- len = recvfrom(socketfd, rbuf, tftp_bufsize, 0,
- (struct sockaddr *) &from, &fromlen);
+ fromlen = peer_lsa->len;
+ from = alloca(fromlen);
+ memset(from, 0, fromlen);
+ len = recvfrom(socketfd, rbuf, tftp_bufsize, 0,
+ from, &fromlen);
if (len < 0) {
bb_perror_msg("recvfrom");
break;
}
-
timeout = 0;
-
- if (sa.sin_port == port) {
- sa.sin_port = from.sin_port;
- }
- if (sa.sin_port == from.sin_port) {
- break;
+ if (from->sa_family == peer_lsa->sa.sa_family) {
+#if ENABLE_FEATURE_IPV6
+ if (from->sa_family == AF_INET6
+ && ((struct sockaddr_in6*)from)->sin6_port == port
+ )
+ break;
+#endif
+ /* Non-internet sockets are ok */
+ if (from->sa_family != AF_INET)
+ break;
+ if (((struct sockaddr_in*)from)->sin_port == port)
+ break;
}
-
- /* fall-through for bad packets! */
- /* discard the packet - treat as timeout */
+ /* family doesn't match, or
+ * it is INET[v6] and port doesn't match -
+ * fall-through for bad packets!
+ * (discard the packet - treat as timeout) */
timeout = TFTP_NUM_RETRIES;
case 0:
bb_error_msg("timeout");
-
timeout--;
if (timeout == 0) {
len = -1;
@@ -331,14 +320,14 @@ static int tftp(const int cmd, const struct hostent *host,
} while (timeout && (len >= 0));
- if ((finished) || (len < 0)) {
+ if (finished || (len < 0)) {
break;
}
/* process received packet */
- opcode = ntohs(*((unsigned short *) rbuf));
- tmp = ntohs(*((unsigned short *) &rbuf[2]));
+ opcode = ntohs( ((uint16_t*)rbuf)[0] );
+ tmp = ntohs( ((uint16_t*)rbuf)[1] );
#if ENABLE_DEBUG_TFTP
fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, tmp);
@@ -352,7 +341,6 @@ static int tftp(const int cmd, const struct hostent *host,
rbuf[tftp_bufsize - 1] = '\0';
} else if (tmp < (sizeof(tftp_bb_error_msg)
/ sizeof(char *))) {
-
msg = tftp_bb_error_msg[tmp];
}
@@ -368,25 +356,22 @@ static int tftp(const int cmd, const struct hostent *host,
want_option_ack = 0;
if (opcode == TFTP_OACK) {
-
/* server seems to support options */
-
char *res;
- res = tftp_option_get(&rbuf[2], len - 2, OPTION_BLOCKSIZE);
+ res = tftp_option_get(&rbuf[2], len - 2, "blksize");
if (res) {
int blksize = xatoi_u(res);
if (tftp_blocksize_check(blksize, tftp_bufsize - 4)) {
-
- if (cmd & tftp_cmd_put) {
+ if (CMD_PUT(cmd)) {
opcode = TFTP_DATA;
} else {
opcode = TFTP_ACK;
}
#if ENABLE_DEBUG_TFTP
- fprintf(stderr, "using %s %u\n", OPTION_BLOCKSIZE,
+ fprintf(stderr, "using blksize %u\n",
blksize);
#endif
tftp_bufsize = blksize + 4;
@@ -407,10 +392,8 @@ static int tftp(const int cmd, const struct hostent *host,
}
#endif
- if ((cmd & tftp_cmd_get) && (opcode == TFTP_DATA)) {
-
+ if (CMD_GET(cmd) && (opcode == TFTP_DATA)) {
if (tmp == block_nr) {
-
len = full_write(localfd, &rbuf[4], len - 4);
if (len < 0) {
@@ -430,6 +413,7 @@ static int tftp(const int cmd, const struct hostent *host,
--block_nr;
opcode = TFTP_ACK;
continue;
+// tmp==(block_nr-1) and (tmp+1)==block_nr is always same, I think. wtf?
} else if (tmp + 1 == block_nr) {
/* Server lost our TFTP_ACK. Resend it */
block_nr = tmp;
@@ -438,9 +422,8 @@ static int tftp(const int cmd, const struct hostent *host,
}
}
- if ((cmd & tftp_cmd_put) && (opcode == TFTP_ACK)) {
-
- if (tmp == (unsigned short) (block_nr - 1)) {
+ if (CMD_PUT(cmd) && (opcode == TFTP_ACK)) {
+ if (tmp == (uint16_t) (block_nr - 1)) {
if (finished) {
break;
}
@@ -462,61 +445,32 @@ static int tftp(const int cmd, const struct hostent *host,
int tftp_main(int argc, char **argv)
{
- struct hostent *host = NULL;
+ len_and_sockaddr *peer_lsa;
const char *localfile = NULL;
const char *remotefile = NULL;
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ const char *sblocksize = NULL;
+#endif
int port;
- int cmd = 0;
+ USE_GETPUT(int cmd;)
int fd = -1;
int flags = 0;
int result;
int blocksize = TFTP_BLOCKSIZE_DEFAULT;
- /* figure out what to pass to getopt */
-
-#if ENABLE_FEATURE_TFTP_BLOCKSIZE
- char *sblocksize = NULL;
-
-#define BS "b:"
-#define BS_ARG , &sblocksize
-#else
-#define BS
-#define BS_ARG
-#endif
-
-#if ENABLE_FEATURE_TFTP_GET
-#define GET "g"
-#define GET_COMPL ":g"
-#else
-#define GET
-#define GET_COMPL
-#endif
+ /* -p or -g is mandatory, and they are mutually exclusive */
+ opt_complementary = "" USE_FEATURE_TFTP_GET("g:") USE_FEATURE_TFTP_PUT("p:")
+ USE_GETPUT("?g--p:p--g");
-#if ENABLE_FEATURE_TFTP_PUT
-#define PUT "p"
-#define PUT_COMPL ":p"
-#else
-#define PUT
-#define PUT_COMPL
-#endif
+ USE_GETPUT(cmd =) getopt32(argc, argv,
+ USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p")
+ "l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"),
+ &localfile, &remotefile
+ USE_FEATURE_TFTP_BLOCKSIZE(, &sblocksize));
-#if defined(CONFIG_FEATURE_TFTP_GET) && defined(CONFIG_FEATURE_TFTP_PUT)
- opt_complementary = GET_COMPL PUT_COMPL ":?g--p:p--g";
-#elif defined(CONFIG_FEATURE_TFTP_GET) || defined(CONFIG_FEATURE_TFTP_PUT)
- opt_complementary = GET_COMPL PUT_COMPL;
-#endif
-
- cmd = getopt32(argc, argv, GET PUT "l:r:" BS, &localfile, &remotefile BS_ARG);
-
- cmd &= (tftp_cmd_get | tftp_cmd_put);
-#if ENABLE_FEATURE_TFTP_GET
- if (cmd == tftp_cmd_get)
+ flags = O_RDONLY;
+ if (CMD_GET(cmd))
flags = O_WRONLY | O_CREAT | O_TRUNC;
-#endif
-#if ENABLE_FEATURE_TFTP_PUT
- if (cmd == tftp_cmd_put)
- flags = O_RDONLY;
-#endif
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
if (sblocksize) {
@@ -535,30 +489,31 @@ int tftp_main(int argc, char **argv)
bb_show_usage();
if (localfile == NULL || LONE_DASH(localfile)) {
- fd = (cmd == tftp_cmd_get) ? STDOUT_FILENO : STDIN_FILENO;
+ fd = CMD_GET(cmd) ? STDOUT_FILENO : STDIN_FILENO;
} else {
- fd = open(localfile, flags, 0644); /* fail below */
- }
- if (fd < 0) {
- bb_perror_msg_and_die("local file");
+ fd = xopen3(localfile, flags, 0644);
}
- host = xgethostbyname(argv[optind]);
port = bb_lookup_port(argv[optind + 1], "udp", 69);
+ peer_lsa = host2sockaddr(argv[optind], port);
#if ENABLE_DEBUG_TFTP
- fprintf(stderr, "using server \"%s\", remotefile \"%s\", "
- "localfile \"%s\".\n",
- inet_ntoa(*((struct in_addr *) host->h_addr)),
+ fprintf(stderr, "using server \"%s\", "
+ "remotefile \"%s\", localfile \"%s\".\n",
+ xmalloc_sockaddr2dotted(&peer_lsa->sa, peer_lsa->len),
remotefile, localfile);
#endif
- result = tftp(cmd, host, remotefile, fd, port, blocksize);
+ result = tftp(
+#if ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
+ cmd,
+#endif
+ peer_lsa, remotefile, fd, port, blocksize);
- if (!(fd == STDOUT_FILENO || fd == STDIN_FILENO)) {
+ if (fd > 1) {
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
- if (cmd == tftp_cmd_get && result != EXIT_SUCCESS)
+ if (CMD_GET(cmd) && result != EXIT_SUCCESS)
unlink(localfile);
}
return result;
generated by cgit v1.1 at 2024-12-29 13:58:54 +0000