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Diffstat (limited to 'networking/tftp.c')
-rw-r--r--networking/tftp.c286
1 files changed, 139 insertions, 147 deletions
diff --git a/networking/tftp.c b/networking/tftp.c
index 527e3dc..e32c5de 100644
--- a/networking/tftp.c
+++ b/networking/tftp.c
@@ -33,13 +33,22 @@
#include "busybox.h"
-//#define CONFIG_FEATURE_TFTP_DEBUG
-#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
-#define TFTP_TIMEOUT 5 /* seconds */
+#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
+#define TFTP_TIMEOUT 5 /* seconds */
+#define TFTP_NUM_RETRIES 5 /* number of retries */
-/* opcodes we support */
+/* RFC2348 says between 8 and 65464 */
+#define TFTP_OCTECTS_MIN 8
+#define TFTP_OCTECTS_MAX 65464
+
+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
#define TFTP_DATA 3
@@ -47,7 +56,7 @@
#define TFTP_ERROR 5
#define TFTP_OACK 6
-static const char * const tftp_bb_error_msg[] = {
+static const char *const tftp_bb_error_msg[] = {
"Undefined error",
"File not found",
"Access violation",
@@ -58,13 +67,10 @@ static const char * const tftp_bb_error_msg[] = {
"No such user"
};
-#ifdef CONFIG_FEATURE_TFTP_GET
-# define tftp_cmd_get 1
-#else
-# define tftp_cmd_get 0
-#endif
-#ifdef CONFIG_FEATURE_TFTP_PUT
-# define tftp_cmd_put (tftp_cmd_get+1)
+#define tftp_cmd_get ENABLE_FEATURE_TFTP_GET
+
+#if ENABLE_FEATURE_TFTP_PUT
+# define tftp_cmd_put (tftp_cmd_get+ENABLE_FEATURE_TFTP_PUT)
#else
# define tftp_cmd_put 0
#endif
@@ -81,15 +87,15 @@ static int tftp_blocksize_check(int blocksize, int bufsize)
*/
if ((bufsize && (blocksize > bufsize)) ||
- (blocksize < 8) || (blocksize > 65464)) {
- bb_error_msg("bad blocksize");
- return 0;
+ (blocksize < TFTP_OCTECTS_MIN) || (blocksize > TFTP_OCTECTS_MAX)) {
+ bb_error_msg("bad blocksize");
+ return 0;
}
return blocksize;
}
-static char *tftp_option_get(char *buf, int len, char *option)
+static char *tftp_option_get(char *buf, int len, const char const *option)
{
int opt_val = 0;
int opt_found = 0;
@@ -97,25 +103,24 @@ static char *tftp_option_get(char *buf, int len, char *option)
while (len > 0) {
- /* Make sure the options are terminated correctly */
+ /* Make sure the options are terminated correctly */
- for (k = 0; k < len; k++) {
- if (buf[k] == '\0') {
- break;
+ for (k = 0; k < len; k++) {
+ if (buf[k] == '\0') {
+ break;
}
}
if (k >= len) {
- break;
+ break;
}
if (opt_val == 0) {
if (strcasecmp(buf, option) == 0) {
- opt_found = 1;
+ opt_found = 1;
}
- }
- else {
- if (opt_found) {
+ } else {
+ if (opt_found) {
return buf;
}
}
@@ -133,38 +138,34 @@ static char *tftp_option_get(char *buf, int len, char *option)
#endif
-static inline int tftp(const int cmd, const struct hostent *host,
- const char *remotefile, int localfd, const unsigned short port, int tftp_bufsize)
+static int tftp(const int cmd, const struct hostent *host,
+ const char *remotefile, const int localfd,
+ const unsigned short port, int tftp_bufsize)
{
- const int cmd_get = cmd & tftp_cmd_get;
- const int cmd_put = cmd & tftp_cmd_put;
- const int bb_tftp_num_retries = 5;
-
+#define cmd_get cmd & tftp_cmd_get
+#define cmd_put cmd & tftp_cmd_put
struct sockaddr_in sa;
struct sockaddr_in from;
struct timeval tv;
socklen_t fromlen;
fd_set rfds;
- char *cp;
- unsigned short tmp;
int socketfd;
- int len;
+ int len, itmp;
int opcode = 0;
int finished = 0;
- int timeout = bb_tftp_num_retries;
+ int timeout = TFTP_NUM_RETRIES;
unsigned short block_nr = 1;
+ unsigned short tmp;
+ char *cp;
-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
- int want_option_ack = 0;
-#endif
+ USE_FEATURE_TFTP_BLOCKSIZE(int want_option_ack = 0;)
/* Can't use RESERVE_CONFIG_BUFFER here since the allocation
* size varies meaning BUFFERS_GO_ON_STACK would fail */
- char *buf=xmalloc(tftp_bufsize + 4);
-
- tftp_bufsize += 4;
+ char *buf=xmalloc(tftp_bufsize += 4);
- if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { /* bb_xsocket? */
+ if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
+ /* need to unlink the localfile, so don't use bb_xsocket here. */
bb_perror_msg("socket");
return EXIT_FAILURE;
}
@@ -180,11 +181,9 @@ static inline int tftp(const int cmd, const struct hostent *host,
sizeof(sa.sin_addr));
/* build opcode */
-
if (cmd_get) {
opcode = TFTP_RRQ;
}
-
if (cmd_put) {
opcode = TFTP_WRQ;
}
@@ -194,56 +193,49 @@ static inline int tftp(const int cmd, const struct hostent *host,
cp = buf;
/* first create the opcode part */
-
*((unsigned short *) cp) = htons(opcode);
-
cp += 2;
/* add filename and mode */
-
- if ((cmd_get && (opcode == TFTP_RRQ)) ||
- (cmd_put && (opcode == TFTP_WRQ))) {
+ if (((cmd_get) && (opcode == TFTP_RRQ)) ||
+ ((cmd_put) && (opcode == TFTP_WRQ)))
+ {
int too_long = 0;
- /* see if the filename fits into buf */
- /* and fill in packet */
-
+ /* see if the filename fits into buf
+ * and fill in packet. */
len = strlen(remotefile) + 1;
if ((cp + len) >= &buf[tftp_bufsize - 1]) {
- too_long = 1;
- }
- else {
- safe_strncpy(cp, remotefile, len);
+ too_long = 1;
+ } else {
+ safe_strncpy(cp, remotefile, len);
cp += len;
}
- if (too_long || ((&buf[tftp_bufsize - 1] - cp) < 6)) {
- bb_error_msg("too long remote-filename");
+ if (too_long || ((&buf[tftp_bufsize - 1] - cp) < MODE_OCTET_LEN)) {
+ bb_error_msg("remote filename too long");
break;
}
/* add "mode" part of the package */
-
- memcpy(cp, "octet", 6);
- cp += 6;
+ memcpy(cp, MODE_OCTET, MODE_OCTET_LEN);
+ cp += MODE_OCTET_LEN;
#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
- len = tftp_bufsize - 4; /* data block size */
+ len = tftp_bufsize - 4; /* data block size */
if (len != TFTP_BLOCKSIZE_DEFAULT) {
- if ((&buf[tftp_bufsize - 1] - cp) < 15) {
- bb_error_msg("too long remote-filename");
+ if ((&buf[tftp_bufsize - 1] - cp) < 15) {
+ bb_error_msg("remote filename too long");
break;
}
/* add "blksize" + number of blocks */
-
- memcpy(cp, "blksize", 8);
- cp += 8;
-
+ memcpy(cp, OPTION_BLOCKSIZE, OPTION_BLOCKSIZE_LEN);
+ cp += OPTION_BLOCKSIZE_LEN;
cp += snprintf(cp, 6, "%d", len) + 1;
want_option_ack = 1;
@@ -253,8 +245,8 @@ static inline int tftp(const int cmd, const struct hostent *host,
/* add ack and data */
- if ((cmd_get && (opcode == TFTP_ACK)) ||
- (cmd_put && (opcode == TFTP_DATA))) {
+ if (((cmd_get) && (opcode == TFTP_ACK)) ||
+ ((cmd_put) && (opcode == TFTP_DATA))) {
*((unsigned short *) cp) = htons(block_nr);
@@ -262,7 +254,7 @@ static inline int tftp(const int cmd, const struct hostent *host,
block_nr++;
- if (cmd_put && (opcode == TFTP_DATA)) {
+ if ((cmd_put) && (opcode == TFTP_DATA)) {
len = bb_full_read(localfd, cp, tftp_bufsize - 4);
if (len < 0) {
@@ -282,7 +274,7 @@ static inline int tftp(const int cmd, const struct hostent *host,
/* send packet */
- timeout = bb_tftp_num_retries; /* re-initialize */
+ timeout = TFTP_NUM_RETRIES; /* re-initialize */
do {
len = cp - buf;
@@ -290,11 +282,11 @@ static inline int tftp(const int cmd, const struct hostent *host,
#ifdef CONFIG_FEATURE_TFTP_DEBUG
fprintf(stderr, "sending %u bytes\n", len);
for (cp = buf; cp < &buf[len]; cp++)
- fprintf(stderr, "%02x ", (unsigned char)*cp);
+ fprintf(stderr, "%02x ", (unsigned char) *cp);
fprintf(stderr, "\n");
#endif
if (sendto(socketfd, buf, len, 0,
- (struct sockaddr *) &sa, sizeof(sa)) < 0) {
+ (struct sockaddr *) &sa, sizeof(sa)) < 0) {
bb_perror_msg("send");
len = -1;
break;
@@ -316,10 +308,10 @@ static inline int tftp(const int cmd, const struct hostent *host,
FD_ZERO(&rfds);
FD_SET(socketfd, &rfds);
- switch (select(socketfd + 1, &rfds, NULL, NULL, &tv)) {
- case 1:
+ itmp = select(socketfd + 1, &rfds, NULL, NULL, &tv);
+ if (itmp == 1) {
len = recvfrom(socketfd, buf, tftp_bufsize, 0,
- (struct sockaddr *) &from, &fromlen);
+ (struct sockaddr *) &from, &fromlen);
if (len < 0) {
bb_perror_msg("recvfrom");
@@ -337,9 +329,9 @@ static inline int tftp(const int cmd, const struct hostent *host,
/* fall-through for bad packets! */
/* discard the packet - treat as timeout */
- timeout = bb_tftp_num_retries;
+ timeout = TFTP_NUM_RETRIES;
- case 0:
+ } else if (itmp == 0) {
bb_error_msg("timeout");
timeout--;
@@ -349,7 +341,7 @@ static inline int tftp(const int cmd, const struct hostent *host,
}
break;
- default:
+ } else {
bb_perror_msg("select");
len = -1;
}
@@ -362,7 +354,6 @@ static inline int tftp(const int cmd, const struct hostent *host,
/* process received packet */
-
opcode = ntohs(*((unsigned short *) buf));
tmp = ntohs(*((unsigned short *) &buf[2]));
@@ -377,7 +368,7 @@ static inline int tftp(const int cmd, const struct hostent *host,
msg = &buf[4];
buf[tftp_bufsize - 1] = '\0';
} else if (tmp < (sizeof(tftp_bb_error_msg)
- / sizeof(char *))) {
+ / sizeof(char *))) {
msg = tftp_bb_error_msg[tmp];
}
@@ -388,55 +379,52 @@ static inline int tftp(const int cmd, const struct hostent *host,
break;
}
-
#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
if (want_option_ack) {
- want_option_ack = 0;
+ want_option_ack = 0;
- if (opcode == TFTP_OACK) {
+ if (opcode == TFTP_OACK) {
- /* server seems to support options */
+ /* server seems to support options */
- char *res;
+ char *res;
- res = tftp_option_get(&buf[2], len-2,
- "blksize");
+ res = tftp_option_get(&buf[2], len - 2, OPTION_BLOCKSIZE);
- if (res) {
- int blksize = atoi(res);
+ if (res) {
+ int blksize = atoi(res);
- if (tftp_blocksize_check(blksize,
- tftp_bufsize - 4)) {
+ if (tftp_blocksize_check(blksize, tftp_bufsize - 4)) {
- if (cmd_put) {
- opcode = TFTP_DATA;
- }
- else {
- opcode = TFTP_ACK;
- }
+ if (cmd_put) {
+ opcode = TFTP_DATA;
+ } else {
+ opcode = TFTP_ACK;
+ }
#ifdef CONFIG_FEATURE_TFTP_DEBUG
- fprintf(stderr, "using blksize %u\n", blksize);
+ fprintf(stderr, "using %s %u\n", OPTION_BLOCKSIZE,
+ blksize);
#endif
- tftp_bufsize = blksize + 4;
- block_nr = 0;
- continue;
- }
- }
- /* FIXME:
- * we should send ERROR 8 */
- bb_error_msg("bad server option");
- break;
- }
-
- bb_error_msg("warning: blksize not supported by server"
- " - reverting to 512");
-
- tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4;
+ tftp_bufsize = blksize + 4;
+ block_nr = 0;
+ continue;
+ }
+ }
+ /* FIXME:
+ * we should send ERROR 8 */
+ bb_error_msg("bad server option");
+ break;
+ }
+
+ bb_error_msg("warning: blksize not supported by server"
+ " - reverting to 512");
+
+ tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4;
}
#endif
- if (cmd_get && (opcode == TFTP_DATA)) {
+ if ((cmd_get) && (opcode == TFTP_DATA)) {
if (tmp == block_nr) {
@@ -455,7 +443,7 @@ static inline int tftp(const int cmd, const struct hostent *host,
continue;
}
/* in case the last ack disappeared into the ether */
- if ( tmp == (block_nr - 1) ) {
+ if (tmp == (block_nr - 1)) {
--block_nr;
opcode = TFTP_ACK;
continue;
@@ -467,9 +455,9 @@ static inline int tftp(const int cmd, const struct hostent *host,
}
}
- if (cmd_put && (opcode == TFTP_ACK)) {
+ if ((cmd_put) && (opcode == TFTP_ACK)) {
- if (tmp == (unsigned short)(block_nr - 1)) {
+ if (tmp == (unsigned short) (block_nr - 1)) {
if (finished) {
break;
}
@@ -482,7 +470,6 @@ static inline int tftp(const int cmd, const struct hostent *host,
#ifdef CONFIG_FEATURE_CLEAN_UP
close(socketfd);
-
free(buf);
#endif
@@ -505,6 +492,7 @@ int tftp_main(int argc, char **argv)
#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
char *sblocksize = NULL;
+
#define BS "b:"
#define BS_ARG , &sblocksize
#else
@@ -533,62 +521,66 @@ int tftp_main(int argc, char **argv)
#elif defined(CONFIG_FEATURE_TFTP_GET) || defined(CONFIG_FEATURE_TFTP_PUT)
bb_opt_complementally = GET_COMPL PUT_COMPL;
#else
- /* XXX: may be should #error ? */
+#error "Either CONFIG_FEATURE_TFTP_GET or CONFIG_FEATURE_TFTP_PUT must be defined"
#endif
cmd = bb_getopt_ulflags(argc, argv, GET PUT "l:r:" BS,
- &localfile, &remotefile BS_ARG);
-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
- if(sblocksize) {
- blocksize = atoi(sblocksize);
- if (!tftp_blocksize_check(blocksize, 0)) {
- return EXIT_FAILURE;
- }
- }
-#endif
+ &localfile, &remotefile BS_ARG);
cmd &= (tftp_cmd_get | tftp_cmd_put);
#ifdef CONFIG_FEATURE_TFTP_GET
- if(cmd == tftp_cmd_get)
+ if (cmd == tftp_cmd_get)
flags = O_WRONLY | O_CREAT | O_TRUNC;
#endif
#ifdef CONFIG_FEATURE_TFTP_PUT
- if(cmd == tftp_cmd_put)
+ if (cmd == tftp_cmd_put)
flags = O_RDONLY;
#endif
- if(localfile == NULL)
- localfile = remotefile;
- if(remotefile == NULL)
- remotefile = localfile;
- /* XXX: I corrected this, but may be wrong too. vodz */
- if(localfile==NULL || strcmp(localfile, "-") == 0) {
- fd = fileno((cmd==tftp_cmd_get)? stdout : stdin);
- } else if (fd==-1) {
- fd = open(localfile, flags, 0644);
+#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+ if (sblocksize) {
+ blocksize = atoi(sblocksize);
+ if (!tftp_blocksize_check(blocksize, 0)) {
+ return EXIT_FAILURE;
+ }
+ }
+#endif
+
+ if (localfile == NULL)
+ localfile = remotefile;
+ if (remotefile == NULL)
+ remotefile = localfile;
+ if ((localfile == NULL && remotefile == NULL) || (argv[optind] == NULL))
+ bb_show_usage();
+
+ if (localfile == NULL || strcmp(localfile, "-") == 0) {
+ fd = (cmd == tftp_cmd_get) ? STDOUT_FILENO : STDIN_FILENO;
+ } else {
+ fd = open(localfile, flags, 0644); /* fail below */
}
if (fd < 0) {
bb_perror_msg_and_die("local file");
}
- /* XXX: argv[optind] and/or argv[optind + 1] may be NULL! */
host = xgethostbyname(argv[optind]);
port = bb_lookup_port(argv[optind + 1], "udp", 69);
#ifdef CONFIG_FEATURE_TFTP_DEBUG
fprintf(stderr, "using server \"%s\", remotefile \"%s\", "
- "localfile \"%s\".\n",
- inet_ntoa(*((struct in_addr *) host->h_addr)),
- remotefile, localfile);
+ "localfile \"%s\".\n",
+ inet_ntoa(*((struct in_addr *) host->h_addr)),
+ remotefile, localfile);
#endif
result = tftp(cmd, host, remotefile, fd, port, blocksize);
#ifdef CONFIG_FEATURE_CLEAN_UP
if (!(fd == STDOUT_FILENO || fd == STDIN_FILENO)) {
- close(fd);
+ close(fd);
}
#endif
- return(result);
+ if (cmd == tftp_cmd_get && result != EXIT_SUCCESS)
+ unlink(localfile);
+ return (result);
}
generated by cgit v1.1 at 2024-12-29 13:07:25 +0000