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First stab at an SFTP client. Currently a Unixland testing app, not

Browse Source 
integrated into PuTTY.

[originally from svn r938]
This commit is contained in:
Simon Tatham 2001-02-23 18:21:44 +00:00
parent af83203852
commit 48b988b439
3 changed files with 1239 additions and 0 deletions
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/*
* psftp.c: front end for PSFTP.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include "sftp.h"
#include "int64.h"
#define smalloc malloc
#define srealloc realloc
#define sfree free
/* ----------------------------------------------------------------------
* String handling routines.
*/
char *dupstr(char *s) {
int len = strlen(s);
char *p = smalloc(len+1);
strcpy(p, s);
return p;
}
/* ----------------------------------------------------------------------
* sftp client state.
*/
char *pwd, *homedir;
/* ----------------------------------------------------------------------
* Higher-level helper functions used in commands.
*/
/*
* Canonify a pathname starting from the pwd.
*/
char *canonify(char *name) {
if (name[0] == '/')
return fxp_realpath(name, NULL);
else
return fxp_realpath(pwd, name);
}
/* ----------------------------------------------------------------------
* Actual sftp commands.
*/
struct sftp_command {
char **words;
int nwords, wordssize;
int (*obey)(struct sftp_command *);/* returns <0 to quit */
};
int sftp_cmd_null(struct sftp_command *cmd) {
return 0;
}
int sftp_cmd_unknown(struct sftp_command *cmd) {
printf("psftp: unknown command \"%s\"\n", cmd->words[0]);
return 0;
}
int sftp_cmd_quit(struct sftp_command *cmd) {
return -1;
}
/*
* List a directory. If no arguments are given, list pwd; otherwise
* list the directory given in words[1].
*/
static int sftp_ls_compare(const void *av, const void *bv) {
const struct fxp_name *a = (const struct fxp_name *)av;
const struct fxp_name *b = (const struct fxp_name *)bv;
return strcmp(a->filename, b->filename);
}
int sftp_cmd_ls(struct sftp_command *cmd) {
struct fxp_handle *dirh;
struct fxp_names *names;
struct fxp_name *ournames;
int nnames, namesize;
char *dir, *cdir;
int i;
if (cmd->nwords < 2)
dir = ".";
else
dir = cmd->words[1];
cdir = canonify(dir);
if (!cdir) {
printf("%s: %s\n", dir, fxp_error());
return 0;
}
printf("Listing directory %s\n", cdir);
dirh = fxp_opendir(cdir);
if (dirh == NULL) {
printf("Unable to open %s: %s\n", dir, fxp_error());
} else {
nnames = namesize = 0;
ournames = NULL;
while (1) {
names = fxp_readdir(dirh);
if (names == NULL) {
if (fxp_error_type() == SSH_FX_EOF)
break;
printf("Reading directory %s: %s\n", dir, fxp_error());
break;
}
if (names->nnames == 0) {
fxp_free_names(names);
break;
}
if (nnames + names->nnames >= namesize) {
namesize += names->nnames + 128;
ournames = srealloc(ournames, namesize * sizeof(*ournames));
}
for (i = 0; i < names->nnames; i++)
ournames[nnames++] = names->names[i];
names->nnames = 0; /* prevent free_names */
fxp_free_names(names);
}
fxp_close(dirh);
/*
* Now we have our filenames. Sort them by actual file
* name, and then output the longname parts.
*/
qsort(ournames, nnames, sizeof(*ournames), sftp_ls_compare);
/*
* And print them.
*/
for (i = 0; i < nnames; i++)
printf("%s\n", ournames[i].longname);
}
sfree(cdir);
return 0;
}
/*
* Change directories. We do this by canonifying the new name, then
* trying to OPENDIR it. Only if that succeeds do we set the new pwd.
*/
int sftp_cmd_cd(struct sftp_command *cmd) {
struct fxp_handle *dirh;
char *dir;
if (cmd->nwords < 2)
dir = fxp_realpath(".", NULL);
else
dir = canonify(cmd->words[1]);
if (!dir) {
printf("%s: %s\n", dir, fxp_error());
return 0;
}
dirh = fxp_opendir(dir);
if (!dirh) {
printf("Directory %s: %s\n", dir, fxp_error());
sfree(dir);
return 0;
}
fxp_close(dirh);
sfree(pwd);
pwd = dir;
printf("Remote directory is now %s\n", pwd);
return 0;
}
/*
* Get a file and save it at the local end.
*/
int sftp_cmd_get(struct sftp_command *cmd) {
struct fxp_handle *fh;
char *fname, *outfname;
uint64 offset;
FILE *fp;
if (cmd->nwords < 2) {
printf("get: expects a filename\n");
return 0;
}
fname = canonify(cmd->words[1]);
if (!fname) {
printf("%s: %s\n", cmd->words[1], fxp_error());
return 0;
}
outfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]);
fh = fxp_open(fname, SSH_FXF_READ);
if (!fh) {
printf("%s: %s\n", fname, fxp_error());
sfree(fname);
return 0;
}
fp = fopen(outfname, "wb");
if (!fp) {
printf("local: unable to open %s\n", outfname);
fxp_close(fh);
sfree(fname);
return 0;
}
printf("remote:%s => local:%s\n", fname, outfname);
offset = uint64_make(0,0);
/*
* FIXME: we can use FXP_FSTAT here to get the file size, and
* thus put up a progress bar.
*/
while (1) {
char buffer[4096];
int len;
int wpos, wlen;
len = fxp_read(fh, buffer, offset, sizeof(buffer));
if ((len == -1 && fxp_error_type() == SSH_FX_EOF) ||
len == 0)
break;
if (len == -1) {
printf("error while reading: %s\n", fxp_error());
break;
}
wpos = 0;
while (wpos < len) {
wlen = fwrite(buffer, 1, len-wpos, fp);
if (wlen <= 0) {
printf("error while writing local file\n");
break;
}
wpos += wlen;
}
if (wpos < len) /* we had an error */
break;
offset = uint64_add32(offset, len);
}
fclose(fp);
fxp_close(fh);
sfree(fname);
return 0;
}
/*
* Send a file and store it at the remote end.
*/
int sftp_cmd_put(struct sftp_command *cmd) {
struct fxp_handle *fh;
char *fname, *origoutfname, *outfname;
uint64 offset;
FILE *fp;
if (cmd->nwords < 2) {
printf("put: expects a filename\n");
return 0;
}
fname = cmd->words[1];
origoutfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]);
outfname = canonify(origoutfname);
~|~ if (!outfname) {
printf("%s: %s\n", origoutfname, fxp_error());
return 0;
}
fp = fopen(fname, "rb");
if (!fp) {
printf("local: unable to open %s\n", fname);
fxp_close(fh);
sfree(outfname);
return 0;
}
fh = fxp_open(outfname, SSH_FXF_WRITE | SSH_FXF_CREAT | SSH_FXF_TRUNC);
if (!fh) {
printf("%s: %s\n", outfname, fxp_error());
sfree(outfname);
return 0;
}
printf("local:%s => remote:%s\n", fname, outfname);
offset = uint64_make(0,0);
/*
* FIXME: we can use FXP_FSTAT here to get the file size, and
* thus put up a progress bar.
*/
while (1) {
char buffer[4096];
int len;
len = fread(buffer, 1, len, fp);
if (len == -1) {
printf("error while reading local file\n");
break;
} else if (len == 0) {
break;
}
if (!fxp_write(fh, buffer, offset, sizeof(buffer))) {
printf("error while writing: %s\n", fxp_error());
break;
}
offset = uint64_add32(offset, len);
}
fxp_close(fh);
fclose(fp);
sfree(outfname);
return 0;
}
static struct sftp_cmd_lookup {
char *name;
int (*obey)(struct sftp_command *);
} sftp_lookup[] = {
/*
* List of sftp commands. This is binary-searched so it MUST be
* in ASCII order.
*/
{"bye", sftp_cmd_quit},
{"cd", sftp_cmd_cd},
{"exit", sftp_cmd_quit},
{"get", sftp_cmd_get},
{"ls", sftp_cmd_ls},
{"put", sftp_cmd_put},
{"quit", sftp_cmd_quit},
};
/* ----------------------------------------------------------------------
* Command line reading and parsing.
*/
struct sftp_command *sftp_getcmd(void) {
char *line;
int linelen, linesize;
struct sftp_command *cmd;
char *p, *q, *r;
int quoting;
printf("psftp> ");
fflush(stdout);
cmd = smalloc(sizeof(struct sftp_command));
cmd->words = NULL;
cmd->nwords = 0;
cmd->wordssize = 0;
line = NULL;
linesize = linelen = 0;
while (1) {
int len;
char *ret;
linesize += 512;
line = srealloc(line, linesize);
ret = fgets(line+linelen, linesize-linelen, stdin);
if (!ret || (linelen == 0 && line[0] == '\0')) {
cmd->obey = sftp_cmd_quit;
printf("quit\n");
return cmd; /* eof */
}
len = linelen + strlen(line+linelen);
linelen += len;
if (line[linelen-1] == '\n') {
linelen--;
line[linelen] = '\0';
break;
}
}
/*
* Parse the command line into words. The syntax is:
* - double quotes are removed, but cause spaces within to be
* treated as non-separating.
* - a double-doublequote pair is a literal double quote, inside
* _or_ outside quotes. Like this:
*
* firstword "second word" "this has ""quotes"" in" sodoes""this""
*
* becomes
*
* >firstword<
* >second word<
* >this has "quotes" in<
* >sodoes"this"<
*/
p = line;
while (*p) {
/* skip whitespace */
while (*p && (*p == ' ' || *p == '\t')) p++;
/* mark start of word */
q = r = p; /* q sits at start, r writes word */
quoting = 0;
while (*p) {
if (!quoting && (*p == ' ' || *p == '\t'))
break; /* reached end of word */
else if (*p == '"' && p[1] == '"')
p+=2, *r++ = '"'; /* a literal quote */
else if (*p == '"')
p++, quoting = !quoting;
else
*r++ = *p++;
}
if (*p) p++; /* skip over the whitespace */
*r = '\0';
if (cmd->nwords >= cmd->wordssize) {
cmd->wordssize = cmd->nwords + 16;
cmd->words = srealloc(cmd->words, cmd->wordssize*sizeof(char *));
}
cmd->words[cmd->nwords++] = q;
}
/*
* Now parse the first word and assign a function.
*/
if (cmd->nwords == 0)
cmd->obey = sftp_cmd_null;
else {
int i, j, k, cmp;
cmd->obey = sftp_cmd_unknown;
i = -1;
j = sizeof(sftp_lookup) / sizeof(*sftp_lookup);
while (j - i > 1) {
k = (j + i) / 2;
cmp = strcmp(cmd->words[0], sftp_lookup[k].name);
if (cmp < 0)
j = k;
else if (cmp > 0)
i = k;
else {
cmd->obey = sftp_lookup[k].obey;
break;
}
}
}
return cmd;
}
void do_sftp(void) {
/*
* Do protocol initialisation.
*/
if (!fxp_init()) {
fprintf(stderr,
"Fatal: unable to initialise SFTP: %s\n",
fxp_error());
}
/*
* Find out where our home directory is.
*/
homedir = fxp_realpath(".", NULL);
if (!homedir) {
fprintf(stderr,
"Warning: failed to resolve home directory: %s\n",
fxp_error());
homedir = dupstr(".");
} else {
printf("Remote working directory is %s\n", homedir);
}
pwd = dupstr(homedir);
/* ------------------------------------------------------------------
* Now we're ready to do Real Stuff.
*/
while (1) {
struct sftp_command *cmd;
cmd = sftp_getcmd();
if (!cmd)
break;
if (cmd->obey(cmd) < 0)
break;
}
/* ------------------------------------------------------------------
* We've received an exit command. Tidy up and leave.
*/
io_finish();
}
int main(void) {
io_init();
do_sftp();
return 0;
}

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/*
* sftp.c: SFTP generic client code.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include "int64.h"
#include "sftp.h"
#define smalloc malloc
#define srealloc realloc
#define sfree free
#define GET_32BIT(cp) \
(((unsigned long)(unsigned char)(cp)[0] << 24) | \
((unsigned long)(unsigned char)(cp)[1] << 16) | \
((unsigned long)(unsigned char)(cp)[2] << 8) | \
((unsigned long)(unsigned char)(cp)[3]))
#define PUT_32BIT(cp, value) { \
(cp)[0] = (unsigned char)((value) >> 24); \
(cp)[1] = (unsigned char)((value) >> 16); \
(cp)[2] = (unsigned char)((value) >> 8); \
(cp)[3] = (unsigned char)(value); }
struct sftp_packet {
char *data;
int length, maxlen;
int savedpos;
int type;
};
/* ----------------------------------------------------------------------
* SFTP packet construction functions.
*/
static void sftp_pkt_ensure(struct sftp_packet *pkt, int length) {
if (pkt->maxlen < length) {
pkt->maxlen = length + 256;
pkt->data = srealloc(pkt->data, pkt->maxlen);
}
}
static void sftp_pkt_adddata(struct sftp_packet *pkt, void *data, int len) {
pkt->length += len;
sftp_pkt_ensure(pkt, pkt->length);
memcpy(pkt->data+pkt->length-len, data, len);
}
static void sftp_pkt_addbyte(struct sftp_packet *pkt, unsigned char byte) {
sftp_pkt_adddata(pkt, &byte, 1);
}
static struct sftp_packet *sftp_pkt_init(int pkt_type) {
struct sftp_packet *pkt;
pkt = smalloc(sizeof(struct sftp_packet));
pkt->data = NULL;
pkt->savedpos = -1;
pkt->length = 0;
pkt->maxlen = 0;
sftp_pkt_addbyte(pkt, (unsigned char)pkt_type);
return pkt;
}
static void sftp_pkt_addbool(struct sftp_packet *pkt, unsigned char value) {
sftp_pkt_adddata(pkt, &value, 1);
}
static void sftp_pkt_adduint32(struct sftp_packet *pkt, unsigned long value) {
unsigned char x[4];
PUT_32BIT(x, value);
sftp_pkt_adddata(pkt, x, 4);
}
static void sftp_pkt_adduint64(struct sftp_packet *pkt, uint64 value) {
unsigned char x[8];
PUT_32BIT(x, value.hi);
PUT_32BIT(x+4, value.lo);
sftp_pkt_adddata(pkt, x, 8);
}
static void sftp_pkt_addstring_start(struct sftp_packet *pkt) {
sftp_pkt_adduint32(pkt, 0);
pkt->savedpos = pkt->length;
}
static void sftp_pkt_addstring_str(struct sftp_packet *pkt, char *data) {
sftp_pkt_adddata(pkt, data, strlen(data));
PUT_32BIT(pkt->data + pkt->savedpos - 4,
pkt->length - pkt->savedpos);
}
static void sftp_pkt_addstring_data(struct sftp_packet *pkt,
char *data, int len) {
sftp_pkt_adddata(pkt, data, len);
PUT_32BIT(pkt->data + pkt->savedpos - 4,
pkt->length - pkt->savedpos);
}
static void sftp_pkt_addstring(struct sftp_packet *pkt, char *data) {
sftp_pkt_addstring_start(pkt);
sftp_pkt_addstring_str(pkt, data);
}
/* ----------------------------------------------------------------------
* SFTP packet decode functions.
*/
static unsigned char sftp_pkt_getbyte(struct sftp_packet *pkt) {
unsigned long value;
if (pkt->length - pkt->savedpos < 1)
return 0; /* arrgh, no way to decline (FIXME?) */
value = (unsigned char) pkt->data[pkt->savedpos];
pkt->savedpos++;
return value;
}
static unsigned long sftp_pkt_getuint32(struct sftp_packet *pkt) {
unsigned long value;
if (pkt->length - pkt->savedpos < 4)
return 0; /* arrgh, no way to decline (FIXME?) */
value = GET_32BIT(pkt->data+pkt->savedpos);
pkt->savedpos += 4;
return value;
}
static void sftp_pkt_getstring(struct sftp_packet *pkt,
char **p, int *length) {
*p = NULL;
if (pkt->length - pkt->savedpos < 4)
return;
*length = GET_32BIT(pkt->data+pkt->savedpos);
pkt->savedpos += 4;
if (pkt->length - pkt->savedpos < *length)
return;
*p = pkt->data+pkt->savedpos;
pkt->savedpos += *length;
}
static struct fxp_attrs sftp_pkt_getattrs(struct sftp_packet *pkt) {
struct fxp_attrs ret;
ret.flags = sftp_pkt_getuint32(pkt);
if (ret.flags & SSH_FILEXFER_ATTR_SIZE) {
unsigned long hi, lo;
hi = sftp_pkt_getuint32(pkt);
lo = sftp_pkt_getuint32(pkt);
ret.size = uint64_make(hi, lo);
}
if (ret.flags & SSH_FILEXFER_ATTR_UIDGID) {
ret.uid = sftp_pkt_getuint32(pkt);
ret.gid = sftp_pkt_getuint32(pkt);
}
if (ret.flags & SSH_FILEXFER_ATTR_PERMISSIONS) {
ret.permissions = sftp_pkt_getuint32(pkt);
}
if (ret.flags & SSH_FILEXFER_ATTR_ACMODTIME) {
ret.atime = sftp_pkt_getuint32(pkt);
ret.mtime = sftp_pkt_getuint32(pkt);
}
if (ret.flags & SSH_FILEXFER_ATTR_EXTENDED) {
int count;
count = sftp_pkt_getuint32(pkt);
while (count--) {
char *str;
int len;
/*
* We should try to analyse these, if we ever find one
* we recognise.
*/
sftp_pkt_getstring(pkt, &str, &len);
sftp_pkt_getstring(pkt, &str, &len);
}
}
return ret;
}
static void sftp_pkt_free(struct sftp_packet *pkt) {
if (pkt->data) sfree(pkt->data);
sfree(pkt);
}
/* ----------------------------------------------------------------------
* Send and receive packet functions. FIXME: change for PuTTY.
*/
int tossh, fromssh;
int io_init(void) {
int to[2], from[2];
int pid;
assert(pipe(to) == 0);
assert(pipe(from) == 0);
pid = fork();
assert(pid >= 0);
if (pid == 0) {
/* We are child. Dup one end of each pipe to our std[io],
* close other end, exec. */
close(0); dup2(to[0], 0); close(to[1]);
close(1); dup2(from[1], 1); close(from[0]);
execl("/home/simon/src/openssh/openssh_cvs/prefix/bin/ssh", "ssh", "-2", "simon@localhost", "-s", "sftp", NULL);
assert(0); /* bomb out if not */
} else {
/* We are parent. Close wrong end of each pipe, assign to glob vars. */
close(to[0]); tossh = to[1];
close(from[1]); fromssh = from[0];
}
}
int io_finish(void) {
int pid, status;
close(tossh);
close(fromssh);
pid = wait(&status);
}
int sftp_send(struct sftp_packet *pkt) {
char x[4];
PUT_32BIT(x, pkt->length);
assert(4 == write(tossh, x, 4));
assert(pkt->length = write(tossh, pkt->data, pkt->length));
sftp_pkt_free(pkt);
}
struct sftp_packet *sftp_recv(void) {
struct sftp_packet *pkt;
char x[4];
int p, ret;
for (p = 0; p < 4 ;) {
ret = read(fromssh, x+p, 4-p);
assert(ret >= 0);
if (ret == 0)
return NULL;
p += ret;
}
pkt = smalloc(sizeof(struct sftp_packet));
pkt->savedpos = 0;
pkt->length = pkt->maxlen = GET_32BIT(x);
pkt->data = smalloc(pkt->length);
for (p = 0; p < pkt->length ;) {
ret = read(fromssh, pkt->data+p, pkt->length-p);
assert(ret >= 0);
if (ret == 0) {
sftp_pkt_free(pkt);
return NULL;
}
p += ret;
}
pkt->type = sftp_pkt_getbyte(pkt);
return pkt;
}
/* ----------------------------------------------------------------------
* String handling routines.
*/
static char *mkstr(char *s, int len) {
char *p = smalloc(len+1);
memcpy(p, s, len);
p[len] = '\0';
return p;
}
/* ----------------------------------------------------------------------
* SFTP primitives.
*/
static const char *fxp_error_message;
static int fxp_errtype;
/*
* Deal with (and free) an FXP_STATUS packet. Return 1 if
* SSH_FX_OK, 0 if SSH_FX_EOF, and -1 for anything else (error).
* Also place the status into fxp_errtype.
*/
static int fxp_got_status(struct sftp_packet *pktin) {
static const char *const messages[] = {
/* SSH_FX_OK. The only time we will display a _message_ for this
* is if we were expecting something other than FXP_STATUS on
* success, so this is actually an error message! */
"unexpected OK response",
"end of file",
"no such file or directory",
"permission denied",
"failure",
"bad message",
"no connection",
"connection lost",
"operation unsupported",
};
if (pktin->type != SSH_FXP_STATUS) {
fxp_error_message = "expected FXP_STATUS packet";
fxp_errtype = -1;
} else {
fxp_errtype = sftp_pkt_getuint32(pktin);
if (fxp_errtype < 0 ||
fxp_errtype >= sizeof(messages)/sizeof(*messages))
fxp_error_message = "unknown error code";
else
fxp_error_message = messages[fxp_errtype];
}
if (fxp_errtype == SSH_FX_OK)
return 1;
else if (fxp_errtype == SSH_FX_EOF)
return 0;
else
return -1;
}
static int fxp_internal_error(char *msg) {
fxp_error_message = msg;
fxp_errtype = -1;
}
const char *fxp_error(void) {
return fxp_error_message;
}
int fxp_error_type(void) {
return fxp_errtype;
}
/*
* Perform exchange of init/version packets. Return 0 on failure.
*/
int fxp_init(void) {
struct sftp_packet *pktout, *pktin;
int remotever;
pktout = sftp_pkt_init(SSH_FXP_INIT);
sftp_pkt_adduint32(pktout, SFTP_PROTO_VERSION);
sftp_send(pktout);
pktin = sftp_recv();
if (pktin->type != SSH_FXP_VERSION) {
fxp_internal_error("did not receive FXP_VERSION");
return 0;
}
remotever = sftp_pkt_getuint32(pktin);
if (remotever > SFTP_PROTO_VERSION) {
fxp_internal_error("remote protocol is more advanced than we support");
return 0;
}
/*
* In principle, this packet might also contain extension-
* string pairs. We should work through them and look for any
* we recognise. In practice we don't currently do so because
* we know we don't recognise _any_.
*/
sftp_pkt_free(pktin);
return 1;
}
/*
* Canonify a pathname. Concatenate the two given path elements
* with a separating slash, unless the second is NULL.
*/
char *fxp_realpath(char *path, char *path2) {
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_REALPATH);
sftp_pkt_adduint32(pktout, 0x123); /* request id */
sftp_pkt_addstring_start(pktout);
sftp_pkt_addstring_str(pktout, path);
if (path2) {
sftp_pkt_addstring_str(pktout, "/");
sftp_pkt_addstring_str(pktout, path2);
}
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
if (id != 0x123) {
fxp_internal_error("request ID mismatch\n");
return NULL;
}
if (pktin->type == SSH_FXP_NAME) {
int count;
char *path;
int len;
count = sftp_pkt_getuint32(pktin);
if (count != 1) {
fxp_internal_error("REALPATH returned name count != 1\n");
return NULL;
}
sftp_pkt_getstring(pktin, &path, &len);
if (!path) {
fxp_internal_error("REALPATH returned malformed FXP_NAME\n");
return NULL;
}
path = mkstr(path, len);
sftp_pkt_free(pktin);
return path;
} else {
fxp_got_status(pktin);
return NULL;
}
}
/*
* Open a file.
*/
struct fxp_handle *fxp_open(char *path, int type) {
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_OPEN);
sftp_pkt_adduint32(pktout, 0x567); /* request id */
sftp_pkt_addstring(pktout, path);
sftp_pkt_adduint32(pktout, type);
sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
if (id != 0x567) {
fxp_internal_error("request ID mismatch\n");
return NULL;
}
if (pktin->type == SSH_FXP_HANDLE) {
int count;
char *hstring;
struct fxp_handle *handle;
int len;
sftp_pkt_getstring(pktin, &hstring, &len);
if (!hstring) {
fxp_internal_error("OPEN returned malformed FXP_HANDLE\n");
return NULL;
}
handle = smalloc(sizeof(struct fxp_handle));
handle->hstring = mkstr(hstring, len);
sftp_pkt_free(pktin);
return handle;
} else {
fxp_got_status(pktin);
return NULL;
}
}
/*
* Open a directory.
*/
struct fxp_handle *fxp_opendir(char *path) {
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_OPENDIR);
sftp_pkt_adduint32(pktout, 0x456); /* request id */
sftp_pkt_addstring(pktout, path);
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
if (id != 0x456) {
fxp_internal_error("request ID mismatch\n");
return NULL;
}
if (pktin->type == SSH_FXP_HANDLE) {
int count;
char *hstring;
struct fxp_handle *handle;
int len;
sftp_pkt_getstring(pktin, &hstring, &len);
if (!hstring) {
fxp_internal_error("OPENDIR returned malformed FXP_HANDLE\n");
return NULL;
}
handle = smalloc(sizeof(struct fxp_handle));
handle->hstring = mkstr(hstring, len);
sftp_pkt_free(pktin);
return handle;
} else {
fxp_got_status(pktin);
return NULL;
}
}
/*
* Close a file/dir.
*/
void fxp_close(struct fxp_handle *handle) {
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_CLOSE);
sftp_pkt_adduint32(pktout, 0x789); /* request id */
sftp_pkt_addstring(pktout, handle->hstring);
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
if (id != 0x789) {
fxp_internal_error("request ID mismatch\n");
return;
}
fxp_got_status(pktin);
sfree(handle->hstring);
sfree(handle);
}
/*
* Read from a file. Returns the number of bytes read, or -1 on an
* error, or possibly 0 if EOF. (I'm not entirely sure whether it
* will return 0 on EOF, or return -1 and store SSH_FX_EOF in the
* error indicator. It might even depend on the SFTP server.)
*/
int fxp_read(struct fxp_handle *handle, char *buffer, uint64 offset, int len) {
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_READ);
sftp_pkt_adduint32(pktout, 0xBCD); /* request id */
sftp_pkt_addstring(pktout, handle->hstring);
sftp_pkt_adduint64(pktout, offset);
sftp_pkt_adduint32(pktout, len);
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
if (id != 0xBCD) {
fxp_internal_error("request ID mismatch");
return;
}
if (pktin->type == SSH_FXP_DATA) {
char *str;
int rlen;
sftp_pkt_getstring(pktin, &str, &rlen);
if (rlen > len || rlen < 0) {
fxp_internal_error("READ returned more bytes than requested");
return -1;
}
memcpy(buffer, str, rlen);
sfree(pktin);
return rlen;
} else {
fxp_got_status(pktin);
return -1;
}
}
/*
* Read from a directory.
*/
struct fxp_names *fxp_readdir(struct fxp_handle *handle) {
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_READDIR);
sftp_pkt_adduint32(pktout, 0xABC); /* request id */
sftp_pkt_addstring(pktout, handle->hstring);
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
if (id != 0xABC) {
fxp_internal_error("request ID mismatch\n");
return;
}
if (pktin->type == SSH_FXP_NAME) {
struct fxp_names *ret;
int i;
ret = smalloc(sizeof(struct fxp_names));
ret->nnames = sftp_pkt_getuint32(pktin);
ret->names = smalloc(ret->nnames * sizeof(struct fxp_name));
for (i = 0; i < ret->nnames; i++) {
char *str;
int len;
sftp_pkt_getstring(pktin, &str, &len);
ret->names[i].filename = mkstr(str, len);
sftp_pkt_getstring(pktin, &str, &len);
ret->names[i].longname = mkstr(str, len);
ret->names[i].attrs = sftp_pkt_getattrs(pktin);
}
return ret;
} else {
fxp_got_status(pktin);
return NULL;
}
}
/*
* Write to a file. Returns 0 on error, 1 on OK.
*/
int fxp_write(struct fxp_handle *handle, char *buffer, uint64 offset, int len) {
struct sftp_packet *pktin, *pktout;
int id;
pktout = sftp_pkt_init(SSH_FXP_WRITE);
sftp_pkt_adduint32(pktout, 0xDCB); /* request id */
sftp_pkt_addstring(pktout, handle->hstring);
sftp_pkt_adduint64(pktout, offset);
sftp_pkt_addstring_start(pktout);
sftp_pkt_addstring_data(pktout, buffer, len);
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
fxp_got_status(pktin);
return fxp_errtype == SSH_FX_OK;
}
/*
* Free up an fxp_names structure.
*/
void fxp_free_names(struct fxp_names *names) {
int i;
for (i = 0; i < names->nnames; i++) {
sfree(names->names[i].filename);
sfree(names->names[i].longname);
}
sfree(names->names);
sfree(names);
}

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sftp.h Normal file
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/*
* sftp.h: definitions for SFTP and the sftp.c routines.
*/
#include "int64.h"
#define SSH_FXP_INIT 1 /* 0x1 */
#define SSH_FXP_VERSION 2 /* 0x2 */
#define SSH_FXP_OPEN 3 /* 0x3 */
#define SSH_FXP_CLOSE 4 /* 0x4 */
#define SSH_FXP_READ 5 /* 0x5 */
#define SSH_FXP_WRITE 6 /* 0x6 */
#define SSH_FXP_LSTAT 7 /* 0x7 */
#define SSH_FXP_FSTAT 8 /* 0x8 */
#define SSH_FXP_SETSTAT 9 /* 0x9 */
#define SSH_FXP_FSETSTAT 10 /* 0xa */
#define SSH_FXP_OPENDIR 11 /* 0xb */
#define SSH_FXP_READDIR 12 /* 0xc */
#define SSH_FXP_REMOVE 13 /* 0xd */
#define SSH_FXP_MKDIR 14 /* 0xe */
#define SSH_FXP_RMDIR 15 /* 0xf */
#define SSH_FXP_REALPATH 16 /* 0x10 */
#define SSH_FXP_STAT 17 /* 0x11 */
#define SSH_FXP_RENAME 18 /* 0x12 */
#define SSH_FXP_STATUS 101 /* 0x65 */
#define SSH_FXP_HANDLE 102 /* 0x66 */
#define SSH_FXP_DATA 103 /* 0x67 */
#define SSH_FXP_NAME 104 /* 0x68 */
#define SSH_FXP_ATTRS 105 /* 0x69 */
#define SSH_FXP_EXTENDED 200 /* 0xc8 */
#define SSH_FXP_EXTENDED_REPLY 201 /* 0xc9 */
#define SSH_FX_OK 0
#define SSH_FX_EOF 1
#define SSH_FX_NO_SUCH_FILE 2
#define SSH_FX_PERMISSION_DENIED 3
#define SSH_FX_FAILURE 4
#define SSH_FX_BAD_MESSAGE 5
#define SSH_FX_NO_CONNECTION 6
#define SSH_FX_CONNECTION_LOST 7
#define SSH_FX_OP_UNSUPPORTED 8
#define SSH_FILEXFER_ATTR_SIZE 0x00000001
#define SSH_FILEXFER_ATTR_UIDGID 0x00000002
#define SSH_FILEXFER_ATTR_PERMISSIONS 0x00000004
#define SSH_FILEXFER_ATTR_ACMODTIME 0x00000008
#define SSH_FILEXFER_ATTR_EXTENDED 0x80000000
#define SSH_FXF_READ 0x00000001
#define SSH_FXF_WRITE 0x00000002
#define SSH_FXF_APPEND 0x00000004
#define SSH_FXF_CREAT 0x00000008
#define SSH_FXF_TRUNC 0x00000010
#define SSH_FXF_EXCL 0x00000020
#define SFTP_PROTO_VERSION 3
struct fxp_attrs {
unsigned long flags;
uint64 size;
unsigned long uid;
unsigned long gid;
unsigned long permissions;
unsigned long atime;
unsigned long mtime;
};
struct fxp_handle {
char *hstring;
};
struct fxp_name {
char *filename, *longname;
struct fxp_attrs attrs;
};
struct fxp_names {
int nnames;
struct fxp_name *names;
};
const char *fxp_error(void);
int fxp_error_type(void);
/*
* Perform exchange of init/version packets. Return 0 on failure.
*/
int fxp_init(void);
/*
* Canonify a pathname. Concatenate the two given path elements
* with a separating slash, unless the second is NULL.
*/
char *fxp_realpath(char *path, char *path2);
/*
* Open a file.
*/
struct fxp_handle *fxp_open(char *path, int type);
/*
* Open a directory.
*/
struct fxp_handle *fxp_opendir(char *path);
/*
* Close a file/dir.
*/
void fxp_close(struct fxp_handle *handle);
/*
* Read from a file.
*/
int fxp_read(struct fxp_handle *handle, char *buffer, uint64 offset, int len);
/*
* Read from a directory.
*/
struct fxp_names *fxp_readdir(struct fxp_handle *handle);
/*
* Free up an fxp_names structure.
*/
void fxp_free_names(struct fxp_names *names);