#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/tftp.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "extern.h"
#define LBUFLEN 200
#define MAXARGV 20
#define HELPINDENT (sizeof("connect"))
void get(int, char **);
void help(int, char **);
void modecmd(int, char **);
void put(int, char **);
void quit(int, char **);
void setascii(int, char **);
void setbinary(int, char **);
void setpeer(char *, char *);
void parsearg(int, char **);
void setrexmt(int, char **);
void settimeout(int, char **);
void settrace(int, char **);
void setverbose(int, char **);
void settsize(int, char **);
void settout(int, char **);
void setblksize(int, char **);
void status(int, char **);
int readcmd(char *, int, FILE *);
static void getusage(char *);
static int makeargv(void);
static void putusage(char *);
static void settftpmode(char *);
static __dead void command(void);
struct cmd *getcmd(char *);
char *tail(char *);
struct sockaddr_storage peeraddr;
int f;
int trace;
int verbose;
int connected;
char mode[32];
char line[LBUFLEN];
int margc;
char *margv[MAXARGV+1];
char *prompt = "tftp";
void intr(int);
int rexmtval = TIMEOUT;
int maxtimeout = 5 * TIMEOUT;
char hostname[HOST_NAME_MAX+1];
FILE *file = NULL;
volatile sig_atomic_t intrflag = 0;
char *ackbuf;
int has_options = 0;
int opt_tsize = 0;
int opt_tout = 0;
int opt_blksize = 0;
struct cmd {
char *name;
char *help;
void (*handler)(int, char **);
};
struct cmd cmdtab[] = {
{ "?", "print help information", help },
{ "ascii", "set mode to netascii", setascii },
{ "binary", "set mode to octet", setbinary },
{ "blksize", "set alternative blksize option", setblksize },
{ "connect", "connect to remote tftp", parsearg },
{ "get", "receive file", get },
{ "help", "print help information", help },
{ "mode", "set file transfer mode", modecmd },
{ "put", "send file", put },
{ "quit", "exit tftp", quit },
{ "rexmt", "set per-packet retransmission timeout", setrexmt },
{ "status", "show current status", status },
{ "timeout", "set total retransmission timeout", settimeout },
{ "tout", "toggle timeout option", settout },
{ "trace", "toggle packet tracing", settrace },
{ "tsize", "toggle tsize option", settsize },
{ "verbose", "toggle verbose mode", setverbose },
{ NULL, NULL, NULL }
};
struct modes {
char *m_name;
char *m_mode;
} modes[] = {
{ "ascii", "netascii" },
{ "netascii", "netascii" },
{ "binary", "octet" },
{ "image", "octet" },
{ "octet", "octet" },
{ NULL, NULL }
};
int
main(int argc, char *argv[])
{
f = -1;
if (pledge("stdio rpath wpath cpath dns inet", NULL) == -1)
err(1, "pledge");
strlcpy(mode, "netascii", sizeof(mode));
if (argc > 1)
parsearg(argc, argv);
signal(SIGINT, intr);
if ((ackbuf = malloc(SEGSIZE_MAX + 4)) == NULL)
err(1, "malloc");
command();
return (0);
}
void
setpeer(char *host, char *port)
{
struct addrinfo hints, *res0, *res;
int error;
struct sockaddr_storage ss;
char *cause = "unknown";
if (connected) {
close(f);
f = -1;
}
connected = 0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
hints.ai_flags = AI_CANONNAME;
if (!port)
port = "tftp";
error = getaddrinfo(host, port, &hints, &res0);
if (error) {
warnx("%s", gai_strerror(error));
return;
}
for (res = res0; res; res = res->ai_next) {
if (res->ai_addrlen > sizeof(peeraddr))
continue;
f = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (f < 0) {
cause = "socket";
continue;
}
memset(&ss, 0, sizeof(ss));
ss.ss_family = res->ai_family;
if (bind(f, (struct sockaddr *)&ss, res->ai_addrlen) < 0) {
cause = "bind";
close(f);
f = -1;
continue;
}
break;
}
if (f < 0)
warn("%s", cause);
else {
memcpy(&peeraddr, res->ai_addr, res->ai_addrlen);
if (res->ai_canonname) {
(void)strlcpy(hostname, res->ai_canonname,
sizeof(hostname));
} else
(void)strlcpy(hostname, host, sizeof(hostname));
connected = 1;
}
freeaddrinfo(res0);
}
void
parsearg(int argc, char *argv[])
{
if (argc < 2) {
strlcpy(line, "Connect ", sizeof(line));
printf("(to) ");
readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin);
if (makeargv())
return;
argc = margc;
argv = margv;
}
if ((argc < 2) || (argc > 3)) {
printf("usage: %s [host [port]]\n", argv[0]);
return;
}
if (argc == 2)
setpeer(argv[1], NULL);
else
setpeer(argv[1], argv[2]);
}
void
modecmd(int argc, char *argv[])
{
struct modes *p;
char *sep;
if (argc < 2) {
printf("Using %s mode to transfer files.\n", mode);
return;
}
if (argc == 2) {
for (p = modes; p->m_name != NULL; p++)
if (strcmp(argv[1], p->m_name) == 0)
break;
if (p->m_name) {
settftpmode(p->m_mode);
return;
}
printf("%s: unknown mode\n", argv[1]);
}
printf("usage: %s [", argv[0]);
sep = " ";
for (p = modes; p->m_name != NULL; p++) {
printf("%s%s", sep, p->m_name);
if (*sep == ' ')
sep = " | ";
}
printf(" ]\n");
return;
}
void
setbinary(int argc, char *argv[])
{
settftpmode("octet");
}
void
setascii(int argc, char *argv[])
{
settftpmode("netascii");
}
static void
settftpmode(char *newmode)
{
strlcpy(mode, newmode, sizeof(mode));
if (verbose)
printf("mode set to %s\n", mode);
}
void
put(int argc, char *argv[])
{
int fd;
int n;
char *cp, *targ;
if (argc < 2) {
strlcpy(line, "put ", sizeof(line));
printf("(file) ");
readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin);
if (makeargv())
return;
argc = margc;
argv = margv;
}
if (argc < 2) {
putusage(argv[0]);
return;
}
targ = argv[argc - 1];
if (strrchr(argv[argc - 1], ':')) {
for (n = 1; n < argc - 1; n++)
if (strchr(argv[n], ':')) {
putusage(argv[0]);
return;
}
cp = argv[argc - 1];
targ = strrchr(cp, ':');
*targ++ = 0;
if (cp[0] == '[' && cp[strlen(cp) - 1] == ']') {
cp[strlen(cp) - 1] = '\0';
cp++;
}
setpeer(cp, NULL);
}
if (!connected) {
printf("No target machine specified.\n");
return;
}
if (argc < 4) {
cp = argc == 2 ? tail(targ) : argv[1];
fd = open(cp, O_RDONLY);
if (fd < 0) {
warn("open: %s", cp);
return;
}
if (verbose)
printf("putting %s to %s:%s [%s]\n",
cp, hostname, targ, mode);
sendfile(fd, targ, mode);
return;
}
for (n = 1; n < argc - 1; n++) {
if (asprintf(&cp, "%s/%s", targ, tail(argv[n])) == -1)
err(1, "asprintf");
fd = open(argv[n], O_RDONLY);
if (fd < 0) {
warn("open: %s", argv[n]);
free(cp);
continue;
}
if (verbose)
printf("putting %s to %s:%s [%s]\n",
argv[n], hostname, cp, mode);
sendfile(fd, cp, mode);
free(cp);
}
}
static void
putusage(char *s)
{
printf("usage: %s file [[host:]remotename]\n", s);
printf(" %s file1 file2 ... fileN [[host:]remote-directory]\n",
s);
}
void
get(int argc, char *argv[])
{
int fd;
int n;
char *cp;
char *src;
if (argc < 2) {
strlcpy(line, "get ", sizeof(line));
printf("(files) ");
readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin);
if (makeargv())
return;
argc = margc;
argv = margv;
}
if (argc < 2) {
getusage(argv[0]);
return;
}
if (!connected) {
for (n = 1; n < argc; n++)
if (strrchr(argv[n], ':') == 0) {
getusage(argv[0]);
return;
}
}
for (n = 1; n < argc; n++) {
src = strrchr(argv[n], ':');
if (src == NULL)
src = argv[n];
else {
char *cp;
*src++ = 0;
cp = argv[n];
if (cp[0] == '[' && cp[strlen(cp) - 1] == ']') {
cp[strlen(cp) - 1] = '\0';
cp++;
}
setpeer(cp, NULL);
if (!connected)
continue;
}
if (argc < 4) {
cp = argc == 3 ? argv[2] : tail(src);
fd = open(cp, O_CREAT | O_TRUNC | O_WRONLY, 0644);
if (fd < 0) {
warn("create: %s", cp);
return;
}
if (verbose)
printf("getting from %s:%s to %s [%s]\n",
hostname, src, cp, mode);
recvfile(fd, src, mode);
break;
}
cp = tail(src);
fd = open(cp, O_CREAT | O_TRUNC | O_WRONLY, 0644);
if (fd < 0) {
warn("create: %s", cp);
continue;
}
if (verbose)
printf("getting from %s:%s to %s [%s]\n",
hostname, src, cp, mode);
recvfile(fd, src, mode);
}
}
static void
getusage(char *s)
{
printf("usage: %s [host:]file [localname]\n", s);
printf(" %s [host1:]file1 [host2:]file2 ... [hostN:]fileN\n", s);
}
void
setrexmt(int argc, char *argv[])
{
int t;
const char *errstr;
if (argc < 2) {
strlcpy(line, "Rexmt-timeout ", sizeof(line));
printf("(value) ");
readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin);
if (makeargv())
return;
argc = margc;
argv = margv;
}
if (argc != 2) {
printf("usage: %s value\n", argv[0]);
return;
}
t = strtonum(argv[1], TIMEOUT_MIN, TIMEOUT_MAX, &errstr);
if (errstr)
printf("%s: value is %s\n", argv[1], errstr);
else
rexmtval = t;
}
void
settimeout(int argc, char *argv[])
{
int t;
const char *errstr;
if (argc < 2) {
strlcpy(line, "Maximum-timeout ", sizeof(line));
printf("(value) ");
readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin);
if (makeargv())
return;
argc = margc;
argv = margv;
}
if (argc != 2) {
printf("usage: %s value\n", argv[0]);
return;
}
t = strtonum(argv[1], TIMEOUT_MIN, TIMEOUT_MAX, &errstr);
if (errstr)
printf("%s: value is %s\n", argv[1], errstr);
else
maxtimeout = t;
}
void
status(int argc, char *argv[])
{
if (connected)
printf("Connected to %s.\n", hostname);
else
printf("Not connected.\n");
printf("Mode: %s Verbose: %s Tracing: %s\n",
mode, verbose ? "on" : "off", trace ? "on" : "off");
printf("Rexmt-interval: %d seconds, Max-timeout: %d seconds\n",
rexmtval, maxtimeout);
}
void
intr(int signo)
{
intrflag = 1;
}
char *
tail(char *filename)
{
char *s;
while (*filename) {
s = strrchr(filename, '/');
if (s == NULL)
break;
if (s[1])
return (s + 1);
*s = '\0';
}
return (filename);
}
static __dead void
command(void)
{
struct cmd *c;
for (;;) {
if (isatty(STDIN_FILENO))
printf("%s> ", prompt);
if (readcmd(line, LBUFLEN, stdin) < 1)
continue;
if ((line[0] == 0) || (line[0] == '\n'))
continue;
if (makeargv())
continue;
if (margc == 0)
continue;
c = getcmd(margv[0]);
if (c == (struct cmd *) - 1) {
printf("?Ambiguous command\n");
continue;
}
if (c == 0) {
printf("?Invalid command\n");
continue;
}
(*c->handler)(margc, margv);
}
}
struct cmd *
getcmd(char *name)
{
char *p, *q;
struct cmd *c, *found;
int nmatches, longest;
longest = 0;
nmatches = 0;
found = 0;
intrflag = 0;
for (c = cmdtab; (p = c->name) != NULL; c++) {
for (q = name; *q == *p++; q++)
if (*q == 0)
return (c);
if (!*q) {
if (q - name > longest) {
longest = q - name;
nmatches = 1;
found = c;
} else if (q - name == longest)
nmatches++;
}
}
if (nmatches > 1)
return ((struct cmd *) - 1);
return (found);
}
static int
makeargv(void)
{
char *cp;
char **argp = margv;
int ret = 0;
margc = 0;
for (cp = line; *cp;) {
if (margc >= MAXARGV) {
printf("too many arguments\n");
ret = 1;
break;
}
while (isspace((unsigned char)*cp))
cp++;
if (*cp == '\0')
break;
*argp++ = cp;
margc += 1;
while (*cp != '\0' && !isspace((unsigned char)*cp))
cp++;
if (*cp == '\0')
break;
*cp++ = '\0';
}
*argp++ = 0;
return (ret);
}
void
quit(int argc, char *argv[])
{
exit(0);
}
void
help(int argc, char *argv[])
{
struct cmd *c;
if (argc == 1) {
printf("Commands may be abbreviated. Commands are:\n\n");
for (c = cmdtab; c->name != NULL; c++)
printf("%-*s\t%s\n", (int)HELPINDENT, c->name, c->help);
return;
}
while (--argc > 0) {
char *arg;
arg = *++argv;
c = getcmd(arg);
if (c == (struct cmd *) - 1)
printf("?Ambiguous help command %s\n", arg);
else if (c == NULL)
printf("?Invalid help command %s\n", arg);
else
printf("%s\n", c->help);
}
}
void
settrace(int argc, char *argv[])
{
trace = !trace;
printf("Packet tracing %s.\n", trace ? "on" : "off");
}
void
setverbose(int argc, char *argv[])
{
verbose = !verbose;
printf("Verbose mode %s.\n", verbose ? "on" : "off");
}
void
settsize(int argc, char *argv[])
{
opt_tsize = !opt_tsize;
printf("Tsize option %s.\n", opt_tsize ? "on" : "off");
if (opt_tsize)
has_options++;
else
has_options--;
}
void
settout(int argc, char *argv[])
{
opt_tout = !opt_tout;
printf("Timeout option %s.\n", opt_tout ? "on" : "off");
if (opt_tout)
has_options++;
else
has_options--;
}
void
setblksize(int argc, char *argv[])
{
int t;
const char *errstr;
if (argc < 2) {
strlcpy(line, "Blocksize ", sizeof(line));
printf("(value) ");
readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin);
if (makeargv())
return;
argc = margc;
argv = margv;
}
if (argc != 2) {
printf("usage: %s value\n", argv[0]);
return;
}
t = strtonum(argv[1], SEGSIZE_MIN, SEGSIZE_MAX, &errstr);
if (errstr)
printf("%s: value is %s\n", argv[1], errstr);
else {
if (opt_blksize == 0)
has_options++;
opt_blksize = t;
}
}
int
readcmd(char *input, int len, FILE *stream)
{
int nfds;
struct pollfd pfd[1];
fflush(stdout);
pfd[0].fd = 0;
pfd[0].events = POLLIN;
nfds = poll(pfd, 1, INFTIM);
if (nfds == -1) {
if (intrflag) {
intrflag = 0;
putchar('\n');
return (0);
}
exit(1);
}
if (fgets(input, len, stream) == NULL) {
if (feof(stdin))
exit(0);
else
return (-1);
}
return (1);
}
