X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/f9e162aa7d74067d3eccca409dec510edf397364..df49ff19185b48ea49bc1122a871802ff36c5daa:/psftp.c diff --git a/psftp.c b/psftp.c index 50be4582..d181af96 100644 --- a/psftp.c +++ b/psftp.c @@ -2,61 +2,30 @@ * psftp.c: front end for PSFTP. */ +#include + #include #include #include #include +#include +#define PUTTY_DO_GLOBALS +#include "putty.h" +#include "storage.h" +#include "ssh.h" #include "sftp.h" #include "int64.h" -#define smalloc malloc -#define srealloc realloc -#define sfree free - -/* ---------------------------------------------------------------------- - * String handling routines. +/* + * Since SFTP is a request-response oriented protocol, it requires + * no buffer management: when we send data, we stop and wait for an + * acknowledgement _anyway_, and so we can't possibly overfill our + * send buffer. */ -char *dupstr(char *s) { - int len = strlen(s); - char *p = smalloc(len+1); - strcpy(p, s); - return p; -} - -/* Allocate the concatenation of N strings. Terminate arg list with NULL. */ -char *dupcat(char *s1, ...) { - int len; - char *p, *q, *sn; - va_list ap; - - len = strlen(s1); - va_start(ap, s1); - while (1) { - sn = va_arg(ap, char *); - if (!sn) - break; - len += strlen(sn); - } - va_end(ap); - - p = smalloc(len+1); - strcpy(p, s1); - q = p + strlen(p); - - va_start(ap, s1); - while (1) { - sn = va_arg(ap, char *); - if (!sn) - break; - strcpy(q, sn); - q += strlen(q); - } - va_end(ap); - - return p; -} +static int psftp_connect(char *userhost, char *user, int portnumber); +static void do_sftp_init(void); /* ---------------------------------------------------------------------- * sftp client state. @@ -73,19 +42,119 @@ char *pwd, *homedir; * canonification fails, at least fall back to returning a _valid_ * pathname (though it may be ugly, eg /home/simon/../foobar). */ -char *canonify(char *name) { +char *canonify(char *name) +{ char *fullname, *canonname; + if (name[0] == '/') { fullname = dupstr(name); } else { - fullname = dupcat(pwd, "/", name, NULL); + char *slash; + if (pwd[strlen(pwd) - 1] == '/') + slash = ""; + else + slash = "/"; + fullname = dupcat(pwd, slash, name, NULL); } - canonname = fxp_realpath(name); + + canonname = fxp_realpath(fullname); + if (canonname) { sfree(fullname); return canonname; - } else - return fullname; + } else { + /* + * Attempt number 2. Some FXP_REALPATH implementations + * (glibc-based ones, in particular) require the _whole_ + * path to point to something that exists, whereas others + * (BSD-based) only require all but the last component to + * exist. So if the first call failed, we should strip off + * everything from the last slash onwards and try again, + * then put the final component back on. + * + * Special cases: + * + * - if the last component is "/." or "/..", then we don't + * bother trying this because there's no way it can work. + * + * - if the thing actually ends with a "/", we remove it + * before we start. Except if the string is "/" itself + * (although I can't see why we'd have got here if so, + * because surely "/" would have worked the first + * time?), in which case we don't bother. + * + * - if there's no slash in the string at all, give up in + * confusion (we expect at least one because of the way + * we constructed the string). + */ + + int i; + char *returnname; + + i = strlen(fullname); + if (i > 2 && fullname[i - 1] == '/') + fullname[--i] = '\0'; /* strip trailing / unless at pos 0 */ + while (i > 0 && fullname[--i] != '/'); + + /* + * Give up on special cases. + */ + if (fullname[i] != '/' || /* no slash at all */ + !strcmp(fullname + i, "/.") || /* ends in /. */ + !strcmp(fullname + i, "/..") || /* ends in /.. */ + !strcmp(fullname, "/")) { + return fullname; + } + + /* + * Now i points at the slash. Deal with the final special + * case i==0 (ie the whole path was "/nonexistentfile"). + */ + fullname[i] = '\0'; /* separate the string */ + if (i == 0) { + canonname = fxp_realpath("/"); + } else { + canonname = fxp_realpath(fullname); + } + + if (!canonname) + return fullname; /* even that failed; give up */ + + /* + * We have a canonical name for all but the last path + * component. Concatenate the last component and return. + */ + returnname = dupcat(canonname, + canonname[strlen(canonname) - 1] == + '/' ? "" : "/", fullname + i + 1, NULL); + sfree(fullname); + sfree(canonname); + return returnname; + } +} + +/* + * Return a pointer to the portion of str that comes after the last + * slash (or backslash or colon, if `local' is TRUE). + */ +static char *stripslashes(char *str, int local) +{ + char *p; + + if (local) { + p = strchr(str, ':'); + if (p) str = p+1; + } + + p = strrchr(str, '/'); + if (p) str = p+1; + + if (local) { + p = strrchr(str, '\\'); + if (p) str = p+1; + } + + return str; } /* ---------------------------------------------------------------------- @@ -94,19 +163,22 @@ char *canonify(char *name) { struct sftp_command { char **words; int nwords, wordssize; - int (*obey)(struct sftp_command *);/* returns <0 to quit */ + int (*obey) (struct sftp_command *); /* returns <0 to quit */ }; -int sftp_cmd_null(struct sftp_command *cmd) { - return 0; +int sftp_cmd_null(struct sftp_command *cmd) +{ + return 1; /* success */ } -int sftp_cmd_unknown(struct sftp_command *cmd) { +int sftp_cmd_unknown(struct sftp_command *cmd) +{ printf("psftp: unknown command \"%s\"\n", cmd->words[0]); - return 0; + return 0; /* failure */ } -int sftp_cmd_quit(struct sftp_command *cmd) { +int sftp_cmd_quit(struct sftp_command *cmd) +{ return -1; } @@ -114,12 +186,14 @@ int sftp_cmd_quit(struct sftp_command *cmd) { * 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; +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) { +int sftp_cmd_ls(struct sftp_command *cmd) +{ struct fxp_handle *dirh; struct fxp_names *names; struct fxp_name *ournames; @@ -127,6 +201,11 @@ int sftp_cmd_ls(struct sftp_command *cmd) { char *dir, *cdir; int i; + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + if (cmd->nwords < 2) dir = "."; else @@ -163,7 +242,8 @@ int sftp_cmd_ls(struct sftp_command *cmd) { if (nnames + names->nnames >= namesize) { namesize += names->nnames + 128; - ournames = srealloc(ournames, namesize * sizeof(*ournames)); + ournames = + srealloc(ournames, namesize * sizeof(*ournames)); } for (i = 0; i < names->nnames; i++) @@ -189,17 +269,23 @@ int sftp_cmd_ls(struct sftp_command *cmd) { sfree(cdir); - return 0; + return 1; } /* * 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) { +int sftp_cmd_cd(struct sftp_command *cmd) +{ struct fxp_handle *dirh; char *dir; + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + if (cmd->nwords < 2) dir = dupstr(homedir); else @@ -223,17 +309,41 @@ int sftp_cmd_cd(struct sftp_command *cmd) { pwd = dir; printf("Remote directory is now %s\n", pwd); - return 0; + return 1; +} + +/* + * Print current directory. Easy as pie. + */ +int sftp_cmd_pwd(struct sftp_command *cmd) +{ + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + + printf("Remote directory is %s\n", pwd); + return 1; } /* - * Get a file and save it at the local end. + * Get a file and save it at the local end. We have two very + * similar commands here: `get' and `reget', which differ in that + * `reget' checks for the existence of the destination file and + * starts from where a previous aborted transfer left off. */ -int sftp_cmd_get(struct sftp_command *cmd) { +int sftp_general_get(struct sftp_command *cmd, int restart) +{ struct fxp_handle *fh; char *fname, *outfname; uint64 offset; FILE *fp; + int ret; + + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } if (cmd->nwords < 2) { printf("get: expects a filename\n"); @@ -245,7 +355,8 @@ int sftp_cmd_get(struct sftp_command *cmd) { printf("%s: %s\n", cmd->words[1], fxp_error()); return 0; } - outfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); + outfname = (cmd->nwords == 2 ? + stripslashes(cmd->words[1], 0) : cmd->words[2]); fh = fxp_open(fname, SSH_FXF_READ); if (!fh) { @@ -253,47 +364,65 @@ int sftp_cmd_get(struct sftp_command *cmd) { sfree(fname); return 0; } - fp = fopen(outfname, "wb"); + + if (restart) { + fp = fopen(outfname, "rb+"); + } else { + fp = fopen(outfname, "wb"); + } + if (!fp) { printf("local: unable to open %s\n", outfname); - fxp_close(fh); + fxp_close(fh); sfree(fname); return 0; } - printf("remote:%s => local:%s\n", fname, outfname); + if (restart) { + long posn; + fseek(fp, 0L, SEEK_END); + posn = ftell(fp); + printf("reget: restarting at file position %ld\n", posn); + offset = uint64_make(0, posn); + } else { + offset = uint64_make(0, 0); + } - offset = uint64_make(0,0); + printf("remote:%s => local:%s\n", fname, outfname); /* * FIXME: we can use FXP_FSTAT here to get the file size, and * thus put up a progress bar. */ + ret = 1; 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) + if ((len == -1 && fxp_error_type() == SSH_FX_EOF) || len == 0) break; if (len == -1) { printf("error while reading: %s\n", fxp_error()); + ret = 0; break; } - + wpos = 0; while (wpos < len) { - wlen = fwrite(buffer, 1, len-wpos, fp); + wlen = fwrite(buffer, 1, len - wpos, fp); if (wlen <= 0) { printf("error while writing local file\n"); + ret = 0; break; } wpos += wlen; } - if (wpos < len) /* we had an error */ + if (wpos < len) { /* we had an error */ + ret = 0; break; + } offset = uint64_add32(offset, len); } @@ -301,17 +430,35 @@ int sftp_cmd_get(struct sftp_command *cmd) { fxp_close(fh); sfree(fname); - return 0; + return ret; +} +int sftp_cmd_get(struct sftp_command *cmd) +{ + return sftp_general_get(cmd, 0); +} +int sftp_cmd_reget(struct sftp_command *cmd) +{ + return sftp_general_get(cmd, 1); } /* - * Send a file and store it at the remote end. + * Send a file and store it at the remote end. We have two very + * similar commands here: `put' and `reput', which differ in that + * `reput' checks for the existence of the destination file and + * starts from where a previous aborted transfer left off. */ -int sftp_cmd_put(struct sftp_command *cmd) { +int sftp_general_put(struct sftp_command *cmd, int restart) +{ struct fxp_handle *fh; char *fname, *origoutfname, *outfname; uint64 offset; FILE *fp; + int ret; + + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } if (cmd->nwords < 2) { printf("put: expects a filename\n"); @@ -319,7 +466,8 @@ int sftp_cmd_put(struct sftp_command *cmd) { } fname = cmd->words[1]; - origoutfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); + origoutfname = (cmd->nwords == 2 ? + stripslashes(cmd->words[1], 1) : cmd->words[2]); outfname = canonify(origoutfname); if (!outfname) { printf("%s: %s\n", origoutfname, fxp_error()); @@ -329,25 +477,56 @@ int sftp_cmd_put(struct sftp_command *cmd) { 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 (restart) { + fh = fxp_open(outfname, + SSH_FXF_WRITE); + } else { + 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); + if (restart) { + char decbuf[30]; + struct fxp_attrs attrs; + if (!fxp_fstat(fh, &attrs)) { + printf("read size of %s: %s\n", outfname, fxp_error()); + sfree(outfname); + return 0; + } + if (!(attrs.flags & SSH_FILEXFER_ATTR_SIZE)) { + printf("read size of %s: size was not given\n", outfname); + sfree(outfname); + return 0; + } + offset = attrs.size; + uint64_decimal(offset, decbuf); + printf("reput: restarting at file position %s\n", decbuf); + if (uint64_compare(offset, uint64_make(0, LONG_MAX)) > 0) { + printf("reput: remote file is larger than we can deal with\n"); + sfree(outfname); + return 0; + } + if (fseek(fp, offset.lo, SEEK_SET) != 0) + fseek(fp, 0, SEEK_END); /* *shrug* */ + } else { + offset = uint64_make(0, 0); + } - offset = uint64_make(0,0); + printf("local:%s => remote:%s\n", fname, outfname); /* * FIXME: we can use FXP_FSTAT here to get the file size, and * thus put up a progress bar. */ + ret = 1; while (1) { char buffer[4096]; int len; @@ -355,12 +534,14 @@ int sftp_cmd_put(struct sftp_command *cmd) { len = fread(buffer, 1, sizeof(buffer), fp); if (len == -1) { printf("error while reading local file\n"); + ret = 0; break; } else if (len == 0) { break; } if (!fxp_write(fh, buffer, offset, len)) { printf("error while writing: %s\n", fxp_error()); + ret = 0; break; } offset = uint64_add32(offset, len); @@ -370,37 +551,619 @@ int sftp_cmd_put(struct sftp_command *cmd) { fclose(fp); sfree(outfname); - return 0; + return ret; } +int sftp_cmd_put(struct sftp_command *cmd) +{ + return sftp_general_put(cmd, 0); +} +int sftp_cmd_reput(struct sftp_command *cmd) +{ + return sftp_general_put(cmd, 1); +} + +int sftp_cmd_mkdir(struct sftp_command *cmd) +{ + char *dir; + int result; + + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + + if (cmd->nwords < 2) { + printf("mkdir: expects a directory\n"); + return 0; + } + + dir = canonify(cmd->words[1]); + if (!dir) { + printf("%s: %s\n", dir, fxp_error()); + return 0; + } + + result = fxp_mkdir(dir); + if (!result) { + printf("mkdir %s: %s\n", dir, fxp_error()); + sfree(dir); + return 0; + } + + sfree(dir); + return 1; +} + +int sftp_cmd_rmdir(struct sftp_command *cmd) +{ + char *dir; + int result; + + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + + if (cmd->nwords < 2) { + printf("rmdir: expects a directory\n"); + return 0; + } + + dir = canonify(cmd->words[1]); + if (!dir) { + printf("%s: %s\n", dir, fxp_error()); + return 0; + } + + result = fxp_rmdir(dir); + if (!result) { + printf("rmdir %s: %s\n", dir, fxp_error()); + sfree(dir); + return 0; + } + + sfree(dir); + return 1; +} + +int sftp_cmd_rm(struct sftp_command *cmd) +{ + char *fname; + int result; + + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + + if (cmd->nwords < 2) { + printf("rm: expects a filename\n"); + return 0; + } + + fname = canonify(cmd->words[1]); + if (!fname) { + printf("%s: %s\n", fname, fxp_error()); + return 0; + } + + result = fxp_remove(fname); + if (!result) { + printf("rm %s: %s\n", fname, fxp_error()); + sfree(fname); + return 0; + } + + sfree(fname); + return 1; +} + +int sftp_cmd_mv(struct sftp_command *cmd) +{ + char *srcfname, *dstfname; + int result; + + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + + if (cmd->nwords < 3) { + printf("mv: expects two filenames\n"); + return 0; + } + srcfname = canonify(cmd->words[1]); + if (!srcfname) { + printf("%s: %s\n", srcfname, fxp_error()); + return 0; + } + + dstfname = canonify(cmd->words[2]); + if (!dstfname) { + printf("%s: %s\n", dstfname, fxp_error()); + return 0; + } + + result = fxp_rename(srcfname, dstfname); + if (!result) { + char const *error = fxp_error(); + struct fxp_attrs attrs; + + /* + * The move might have failed because dstfname pointed at a + * directory. We check this possibility now: if dstfname + * _is_ a directory, we re-attempt the move by appending + * the basename of srcfname to dstfname. + */ + result = fxp_stat(dstfname, &attrs); + if (result && + (attrs.flags & SSH_FILEXFER_ATTR_PERMISSIONS) && + (attrs.permissions & 0040000)) { + char *p; + char *newname, *newcanon; + printf("(destination %s is a directory)\n", dstfname); + p = srcfname + strlen(srcfname); + while (p > srcfname && p[-1] != '/') p--; + newname = dupcat(dstfname, "/", p, NULL); + newcanon = canonify(newname); + sfree(newname); + if (newcanon) { + sfree(dstfname); + dstfname = newcanon; + result = fxp_rename(srcfname, dstfname); + error = result ? NULL : fxp_error(); + } + } + if (error) { + printf("mv %s %s: %s\n", srcfname, dstfname, error); + sfree(srcfname); + sfree(dstfname); + return 0; + } + } + printf("%s -> %s\n", srcfname, dstfname); + + sfree(srcfname); + sfree(dstfname); + return 1; +} + +int sftp_cmd_chmod(struct sftp_command *cmd) +{ + char *fname, *mode; + int result; + struct fxp_attrs attrs; + unsigned attrs_clr, attrs_xor, oldperms, newperms; + + if (back == NULL) { + printf("psftp: not connected to a host; use \"open host.name\"\n"); + return 0; + } + + if (cmd->nwords < 3) { + printf("chmod: expects a mode specifier and a filename\n"); + return 0; + } + + /* + * Attempt to parse the mode specifier in cmd->words[1]. We + * don't support the full horror of Unix chmod; instead we + * support a much simpler syntax in which the user can either + * specify an octal number, or a comma-separated sequence of + * [ugoa]*[-+=][rwxst]+. (The initial [ugoa] sequence may + * _only_ be omitted if the only attribute mentioned is t, + * since all others require a user/group/other specification. + * Additionally, the s attribute may not be specified for any + * [ugoa] specifications other than exactly u or exactly g. + */ + attrs_clr = attrs_xor = 0; + mode = cmd->words[1]; + if (mode[0] >= '0' && mode[0] <= '9') { + if (mode[strspn(mode, "01234567")]) { + printf("chmod: numeric file modes should" + " contain digits 0-7 only\n"); + return 0; + } + attrs_clr = 07777; + sscanf(mode, "%o", &attrs_xor); + attrs_xor &= attrs_clr; + } else { + while (*mode) { + char *modebegin = mode; + unsigned subset, perms; + int action; + + subset = 0; + while (*mode && *mode != ',' && + *mode != '+' && *mode != '-' && *mode != '=') { + switch (*mode) { + case 'u': subset |= 04700; break; /* setuid, user perms */ + case 'g': subset |= 02070; break; /* setgid, group perms */ + case 'o': subset |= 00007; break; /* just other perms */ + case 'a': subset |= 06777; break; /* all of the above */ + default: + printf("chmod: file mode '%.*s' contains unrecognised" + " user/group/other specifier '%c'\n", + strcspn(modebegin, ","), modebegin, *mode); + return 0; + } + mode++; + } + if (!*mode || *mode == ',') { + printf("chmod: file mode '%.*s' is incomplete\n", + strcspn(modebegin, ","), modebegin); + return 0; + } + action = *mode++; + if (!*mode || *mode == ',') { + printf("chmod: file mode '%.*s' is incomplete\n", + strcspn(modebegin, ","), modebegin); + return 0; + } + perms = 0; + while (*mode && *mode != ',') { + switch (*mode) { + case 'r': perms |= 00444; break; + case 'w': perms |= 00222; break; + case 'x': perms |= 00111; break; + case 't': perms |= 01000; subset |= 01000; break; + case 's': + if ((subset & 06777) != 04700 && + (subset & 06777) != 02070) { + printf("chmod: file mode '%.*s': set[ug]id bit should" + " be used with exactly one of u or g only\n", + strcspn(modebegin, ","), modebegin); + return 0; + } + perms |= 06000; + break; + default: + printf("chmod: file mode '%.*s' contains unrecognised" + " permission specifier '%c'\n", + strcspn(modebegin, ","), modebegin, *mode); + return 0; + } + mode++; + } + if (!(subset & 06777) && (perms &~ subset)) { + printf("chmod: file mode '%.*s' contains no user/group/other" + " specifier and permissions other than 't' \n", + strcspn(modebegin, ","), modebegin, *mode); + return 0; + } + perms &= subset; + switch (action) { + case '+': + attrs_clr |= perms; + attrs_xor |= perms; + break; + case '-': + attrs_clr |= perms; + attrs_xor &= ~perms; + break; + case '=': + attrs_clr |= subset; + attrs_xor |= perms; + break; + } + if (*mode) mode++; /* eat comma */ + } + } + + fname = canonify(cmd->words[2]); + if (!fname) { + printf("%s: %s\n", fname, fxp_error()); + return 0; + } + + result = fxp_stat(fname, &attrs); + if (!result || !(attrs.flags & SSH_FILEXFER_ATTR_PERMISSIONS)) { + printf("get attrs for %s: %s\n", fname, + result ? "file permissions not provided" : fxp_error()); + sfree(fname); + return 0; + } + + attrs.flags = SSH_FILEXFER_ATTR_PERMISSIONS; /* perms _only_ */ + oldperms = attrs.permissions & 07777; + attrs.permissions &= ~attrs_clr; + attrs.permissions ^= attrs_xor; + newperms = attrs.permissions & 07777; + + result = fxp_setstat(fname, attrs); + + if (!result) { + printf("set attrs for %s: %s\n", fname, fxp_error()); + sfree(fname); + return 0; + } + + printf("%s: %04o -> %04o\n", fname, oldperms, newperms); + + sfree(fname); + return 1; +} + +static int sftp_cmd_open(struct sftp_command *cmd) +{ + if (back != NULL) { + printf("psftp: already connected\n"); + return 0; + } + + if (cmd->nwords < 2) { + printf("open: expects a host name\n"); + return 0; + } + + if (psftp_connect(cmd->words[1], NULL, 0)) { + back = NULL; /* connection is already closed */ + return -1; /* this is fatal */ + } + do_sftp_init(); + return 1; +} + +static int sftp_cmd_help(struct sftp_command *cmd); static struct sftp_cmd_lookup { char *name; - int (*obey)(struct sftp_command *); + /* + * For help purposes, there are two kinds of command: + * + * - primary commands, in which `longhelp' is non-NULL. In + * this case `shorthelp' is descriptive text, and `longhelp' + * is longer descriptive text intended to be printed after + * the command name. + * + * - alias commands, in which `longhelp' is NULL. In this case + * `shorthelp' is the name of a primary command, which + * contains the help that should double up for this command. + */ + char *shorthelp; + char *longhelp; + 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}, + { + "bye", "finish your SFTP session", + "\n" + " Terminates your SFTP session and quits the PSFTP program.\n", + sftp_cmd_quit + }, + { + "cd", "change your remote working directory", + " [ ]\n" + " Change the remote working directory for your SFTP session.\n" + " If a new working directory is not supplied, you will be\n" + " returned to your home directory.\n", + sftp_cmd_cd + }, + { + "chmod", "change file permissions and modes", + " ( | ) \n" + " Change the file permissions on a file or directory.\n" + " can be any octal Unix permission specifier.\n" + " Alternatively, can include:\n" + " u+r make file readable by owning user\n" + " u+w make file writable by owning user\n" + " u+x make file executable by owning user\n" + " u-r make file not readable by owning user\n" + " [also u-w, u-x]\n" + " g+r make file readable by members of owning group\n" + " [also g+w, g+x, g-r, g-w, g-x]\n" + " o+r make file readable by all other users\n" + " [also o+w, o+x, o-r, o-w, o-x]\n" + " a+r make file readable by absolutely everybody\n" + " [also a+w, a+x, a-r, a-w, a-x]\n" + " u+s enable the Unix set-user-ID bit\n" + " u-s disable the Unix set-user-ID bit\n" + " g+s enable the Unix set-group-ID bit\n" + " g-s disable the Unix set-group-ID bit\n" + " +t enable the Unix \"sticky bit\"\n" + " You can give more than one modifier for the same user (\"g-rwx\"), and\n" + " more than one user for the same modifier (\"ug+w\"). You can\n" + " use commas to separate different modifiers (\"u+rwx,g+s\").\n", + sftp_cmd_chmod + }, + { + "del", "delete a file", + " \n" + " Delete a file.\n", + sftp_cmd_rm + }, + { + "delete", "delete a file", + "\n" + " Delete a file.\n", + sftp_cmd_rm + }, + { + "dir", "list contents of a remote directory", + " [ ]\n" + " List the contents of a specified directory on the server.\n" + " If is not given, the current working directory\n" + " will be listed.\n", + sftp_cmd_ls + }, + { + "exit", "bye", NULL, sftp_cmd_quit + }, + { + "get", "download a file from the server to your local machine", + " [ ]\n" + " Downloads a file on the server and stores it locally under\n" + " the same name, or under a different one if you supply the\n" + " argument .\n", + sftp_cmd_get + }, + { + "help", "give help", + " [ [ ... ] ]\n" + " Give general help if no commands are specified.\n" + " If one or more commands are specified, give specific help on\n" + " those particular commands.\n", + sftp_cmd_help + }, + { + "ls", "dir", NULL, + sftp_cmd_ls + }, + { + "mkdir", "create a directory on the remote server", + " \n" + " Creates a directory with the given name on the server.\n", + sftp_cmd_mkdir + }, + { + "mv", "move or rename a file on the remote server", + " \n" + " Moves or renames the file on the server,\n" + " so that it is accessible under the name .\n", + sftp_cmd_mv + }, + { + "put", "upload a file from your local machine to the server", + " [ ]\n" + " Uploads a file to the server and stores it there under\n" + " the same name, or under a different one if you supply the\n" + " argument .\n", + sftp_cmd_put + }, + { + "open", "connect to a host", + " [@]\n" + " Establishes an SFTP connection to a given host. Only usable\n" + " when you did not already specify a host name on the command\n" + " line.\n", + sftp_cmd_open + }, + { + "pwd", "print your remote working directory", + "\n" + " Print the current remote working directory for your SFTP session.\n", + sftp_cmd_pwd + }, + { + "quit", "bye", NULL, + sftp_cmd_quit + }, + { + "reget", "continue downloading a file", + " [ ]\n" + " Works exactly like the \"get\" command, but the local file\n" + " must already exist. The download will begin at the end of the\n" + " file. This is for resuming a download that was interrupted.\n", + sftp_cmd_reget + }, + { + "ren", "mv", NULL, + sftp_cmd_mv + }, + { + "rename", "mv", NULL, + sftp_cmd_mv + }, + { + "reput", "continue uploading a file", + " [ ]\n" + " Works exactly like the \"put\" command, but the remote file\n" + " must already exist. The upload will begin at the end of the\n" + " file. This is for resuming an upload that was interrupted.\n", + sftp_cmd_reput + }, + { + "rm", "del", NULL, + sftp_cmd_rm + }, + { + "rmdir", "remove a directory on the remote server", + " \n" + " Removes the directory with the given name on the server.\n" + " The directory will not be removed unless it is empty.\n", + sftp_cmd_rmdir + } }; +const struct sftp_cmd_lookup *lookup_command(char *name) +{ + int i, j, k, cmp; + + i = -1; + j = sizeof(sftp_lookup) / sizeof(*sftp_lookup); + while (j - i > 1) { + k = (j + i) / 2; + cmp = strcmp(name, sftp_lookup[k].name); + if (cmp < 0) + j = k; + else if (cmp > 0) + i = k; + else { + return &sftp_lookup[k]; + } + } + return NULL; +} + +static int sftp_cmd_help(struct sftp_command *cmd) +{ + int i; + if (cmd->nwords == 1) { + /* + * Give short help on each command. + */ + int maxlen; + maxlen = 0; + for (i = 0; i < sizeof(sftp_lookup) / sizeof(*sftp_lookup); i++) { + int len = strlen(sftp_lookup[i].name); + if (maxlen < len) + maxlen = len; + } + for (i = 0; i < sizeof(sftp_lookup) / sizeof(*sftp_lookup); i++) { + const struct sftp_cmd_lookup *lookup; + lookup = &sftp_lookup[i]; + printf("%-*s", maxlen+2, lookup->name); + if (lookup->longhelp == NULL) + lookup = lookup_command(lookup->shorthelp); + printf("%s\n", lookup->shorthelp); + } + } else { + /* + * Give long help on specific commands. + */ + for (i = 1; i < cmd->nwords; i++) { + const struct sftp_cmd_lookup *lookup; + lookup = lookup_command(cmd->words[i]); + if (!lookup) { + printf("help: %s: command not found\n", cmd->words[i]); + } else { + printf("%s", lookup->name); + if (lookup->longhelp == NULL) + lookup = lookup_command(lookup->shorthelp); + printf("%s", lookup->longhelp); + } + } + } + return 1; +} + /* ---------------------------------------------------------------------- * Command line reading and parsing. */ -struct sftp_command *sftp_getcmd(void) { +struct sftp_command *sftp_getcmd(FILE *fp, int mode, int modeflags) +{ char *line; int linelen, linesize; struct sftp_command *cmd; char *p, *q, *r; int quoting; - printf("psftp> "); + if ((mode == 0) || (modeflags & 1)) { + printf("psftp> "); + } fflush(stdout); cmd = smalloc(sizeof(struct sftp_command)); @@ -416,21 +1179,24 @@ struct sftp_command *sftp_getcmd(void) { linesize += 512; line = srealloc(line, linesize); - ret = fgets(line+linelen, linesize-linelen, stdin); + ret = fgets(line + linelen, linesize - linelen, fp); if (!ret || (linelen == 0 && line[0] == '\0')) { cmd->obey = sftp_cmd_quit; printf("quit\n"); return cmd; /* eof */ } - len = linelen + strlen(line+linelen); + len = linelen + strlen(line + linelen); linelen += len; - if (line[linelen-1] == '\n') { + if (line[linelen - 1] == '\n') { linelen--; line[linelen] = '\0'; break; } } + if (modeflags & 1) { + printf("%s\n", line); + } /* * Parse the command line into words. The syntax is: @@ -451,7 +1217,8 @@ struct sftp_command *sftp_getcmd(void) { p = line; while (*p) { /* skip whitespace */ - while (*p && (*p == ' ' || *p == '\t')) p++; + while (*p && (*p == ' ' || *p == '\t')) + p++; /* mark start of word */ q = r = p; /* q sits at start, r writes word */ quoting = 0; @@ -459,17 +1226,19 @@ struct sftp_command *sftp_getcmd(void) { if (!quoting && (*p == ' ' || *p == '\t')) break; /* reached end of word */ else if (*p == '"' && p[1] == '"') - p+=2, *r++ = '"'; /* a literal quote */ + p += 2, *r++ = '"'; /* a literal quote */ else if (*p == '"') p++, quoting = !quoting; else *r++ = *p++; } - if (*p) p++; /* skip over the whitespace */ + 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 = + srealloc(cmd->words, cmd->wordssize * sizeof(char *)); } cmd->words[cmd->nwords++] = q; } @@ -481,37 +1250,26 @@ struct sftp_command *sftp_getcmd(void) { 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; - } - } + const struct sftp_cmd_lookup *lookup; + lookup = lookup_command(cmd->words[0]); + if (!lookup) + cmd->obey = sftp_cmd_unknown; + else + cmd->obey = lookup->obey; } return cmd; } -void do_sftp(void) { +static void do_sftp_init(void) +{ /* * Do protocol initialisation. */ if (!fxp_init()) { fprintf(stderr, - "Fatal: unable to initialise SFTP: %s\n", - fxp_error()); + "Fatal: unable to initialise SFTP: %s\n", fxp_error()); + return; } /* @@ -527,27 +1285,671 @@ void do_sftp(void) { printf("Remote working directory is %s\n", homedir); } pwd = dupstr(homedir); +} - /* ------------------------------------------------------------------ - * Now we're ready to do Real Stuff. +void do_sftp(int mode, int modeflags, char *batchfile) +{ + FILE *fp; + int ret; + + /* + * Batch mode? */ - while (1) { - struct sftp_command *cmd; - cmd = sftp_getcmd(); - if (!cmd) - break; - if (cmd->obey(cmd) < 0) - break; + if (mode == 0) { + + /* ------------------------------------------------------------------ + * Now we're ready to do Real Stuff. + */ + while (1) { + struct sftp_command *cmd; + cmd = sftp_getcmd(stdin, 0, 0); + if (!cmd) + break; + if (cmd->obey(cmd) < 0) + break; + } + } else { + fp = fopen(batchfile, "r"); + if (!fp) { + printf("Fatal: unable to open %s\n", batchfile); + return; + } + while (1) { + struct sftp_command *cmd; + cmd = sftp_getcmd(fp, mode, modeflags); + if (!cmd) + break; + ret = cmd->obey(cmd); + if (ret < 0) + break; + if (ret == 0) { + if (!(modeflags & 2)) + break; + } + } + fclose(fp); + + } +} + +/* ---------------------------------------------------------------------- + * Dirty bits: integration with PuTTY. + */ + +static int verbose = 0; + +void verify_ssh_host_key(char *host, int port, char *keytype, + char *keystr, char *fingerprint) +{ + int ret; + HANDLE hin; + DWORD savemode, i; + + static const char absentmsg[] = + "The server's host key is not cached in the registry. You\n" + "have no guarantee that the server is the computer you\n" + "think it is.\n" + "The server's key fingerprint is:\n" + "%s\n" + "If you trust this host, enter \"y\" to add the key to\n" + "PuTTY's cache and carry on connecting.\n" + "If you want to carry on connecting just once, without\n" + "adding the key to the cache, enter \"n\".\n" + "If you do not trust this host, press Return to abandon the\n" + "connection.\n" + "Store key in cache? (y/n) "; + + static const char wrongmsg[] = + "WARNING - POTENTIAL SECURITY BREACH!\n" + "The server's host key does not match the one PuTTY has\n" + "cached in the registry. This means that either the\n" + "server administrator has changed the host key, or you\n" + "have actually connected to another computer pretending\n" + "to be the server.\n" + "The new key fingerprint is:\n" + "%s\n" + "If you were expecting this change and trust the new key,\n" + "enter \"y\" to update PuTTY's cache and continue connecting.\n" + "If you want to carry on connecting but without updating\n" + "the cache, enter \"n\".\n" + "If you want to abandon the connection completely, press\n" + "Return to cancel. Pressing Return is the ONLY guaranteed\n" + "safe choice.\n" + "Update cached key? (y/n, Return cancels connection) "; + + static const char abandoned[] = "Connection abandoned.\n"; + + char line[32]; + + /* + * Verify the key against the registry. + */ + ret = verify_host_key(host, port, keytype, keystr); + + if (ret == 0) /* success - key matched OK */ + return; + + if (ret == 2) { /* key was different */ + fprintf(stderr, wrongmsg, fingerprint); + fflush(stderr); + } + if (ret == 1) { /* key was absent */ + fprintf(stderr, absentmsg, fingerprint); + fflush(stderr); + } + + hin = GetStdHandle(STD_INPUT_HANDLE); + GetConsoleMode(hin, &savemode); + SetConsoleMode(hin, (savemode | ENABLE_ECHO_INPUT | + ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT)); + ReadFile(hin, line, sizeof(line) - 1, &i, NULL); + SetConsoleMode(hin, savemode); + + if (line[0] != '\0' && line[0] != '\r' && line[0] != '\n') { + if (line[0] == 'y' || line[0] == 'Y') + store_host_key(host, port, keytype, keystr); + } else { + fprintf(stderr, abandoned); + exit(0); + } +} + +/* + * Ask whether the selected cipher is acceptable (since it was + * below the configured 'warn' threshold). + * cs: 0 = both ways, 1 = client->server, 2 = server->client + */ +void askcipher(char *ciphername, int cs) +{ + HANDLE hin; + DWORD savemode, i; + + static const char msg[] = + "The first %scipher supported by the server is\n" + "%s, which is below the configured warning threshold.\n" + "Continue with connection? (y/n) "; + static const char abandoned[] = "Connection abandoned.\n"; + + char line[32]; + + fprintf(stderr, msg, + (cs == 0) ? "" : + (cs == 1) ? "client-to-server " : + "server-to-client ", + ciphername); + fflush(stderr); + + hin = GetStdHandle(STD_INPUT_HANDLE); + GetConsoleMode(hin, &savemode); + SetConsoleMode(hin, (savemode | ENABLE_ECHO_INPUT | + ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT)); + ReadFile(hin, line, sizeof(line) - 1, &i, NULL); + SetConsoleMode(hin, savemode); + + if (line[0] == 'y' || line[0] == 'Y') { + return; + } else { + fprintf(stderr, abandoned); + exit(0); + } +} + +/* + * Warn about the obsolescent key file format. + */ +void old_keyfile_warning(void) +{ + static const char message[] = + "You are loading an SSH 2 private key which has an\n" + "old version of the file format. This means your key\n" + "file is not fully tamperproof. Future versions of\n" + "PuTTY may stop supporting this private key format,\n" + "so we recommend you convert your key to the new\n" + "format.\n" + "\n" + "Once the key is loaded into PuTTYgen, you can perform\n" + "this conversion simply by saving it again.\n"; + + fputs(message, stderr); +} + +/* + * Print an error message and perform a fatal exit. + */ +void fatalbox(char *fmt, ...) +{ + char str[0x100]; /* Make the size big enough */ + va_list ap; + va_start(ap, fmt); + strcpy(str, "Fatal:"); + vsprintf(str + strlen(str), fmt, ap); + va_end(ap); + strcat(str, "\n"); + fputs(stderr, str); + + exit(1); +} +void connection_fatal(char *fmt, ...) +{ + char str[0x100]; /* Make the size big enough */ + va_list ap; + va_start(ap, fmt); + strcpy(str, "Fatal:"); + vsprintf(str + strlen(str), fmt, ap); + va_end(ap); + strcat(str, "\n"); + fputs(stderr, str); + + exit(1); +} + +void logevent(char *string) +{ +} + +void ldisc_send(char *buf, int len, int interactive) +{ + /* + * This is only here because of the calls to ldisc_send(NULL, + * 0) in ssh.c. Nothing in PSFTP actually needs to use the + * ldisc as an ldisc. So if we get called with any real data, I + * want to know about it. + */ + assert(len == 0); +} + +/* + * Be told what socket we're supposed to be using. + */ +static SOCKET sftp_ssh_socket; +char *do_select(SOCKET skt, int startup) +{ + if (startup) + sftp_ssh_socket = skt; + else + sftp_ssh_socket = INVALID_SOCKET; + return NULL; +} +extern int select_result(WPARAM, LPARAM); + +/* + * Receive a block of data from the SSH link. Block until all data + * is available. + * + * To do this, we repeatedly call the SSH protocol module, with our + * own trap in from_backend() to catch the data that comes back. We + * do this until we have enough data. + */ + +static unsigned char *outptr; /* where to put the data */ +static unsigned outlen; /* how much data required */ +static unsigned char *pending = NULL; /* any spare data */ +static unsigned pendlen = 0, pendsize = 0; /* length and phys. size of buffer */ +int from_backend(int is_stderr, char *data, int datalen) +{ + unsigned char *p = (unsigned char *) data; + unsigned len = (unsigned) datalen; + + /* + * stderr data is just spouted to local stderr and otherwise + * ignored. + */ + if (is_stderr) { + fwrite(data, 1, len, stderr); + return 0; + } + + /* + * If this is before the real session begins, just return. + */ + if (!outptr) + return 0; + + if (outlen > 0) { + unsigned used = outlen; + if (used > len) + used = len; + memcpy(outptr, p, used); + outptr += used; + outlen -= used; + p += used; + len -= used; + } + + if (len > 0) { + if (pendsize < pendlen + len) { + pendsize = pendlen + len + 4096; + pending = (pending ? srealloc(pending, pendsize) : + smalloc(pendsize)); + if (!pending) + fatalbox("Out of memory"); + } + memcpy(pending + pendlen, p, len); + pendlen += len; + } + + return 0; +} +int sftp_recvdata(char *buf, int len) +{ + outptr = (unsigned char *) buf; + outlen = len; + + /* + * See if the pending-input block contains some of what we + * need. + */ + if (pendlen > 0) { + unsigned pendused = pendlen; + if (pendused > outlen) + pendused = outlen; + memcpy(outptr, pending, pendused); + memmove(pending, pending + pendused, pendlen - pendused); + outptr += pendused; + outlen -= pendused; + pendlen -= pendused; + if (pendlen == 0) { + pendsize = 0; + sfree(pending); + pending = NULL; + } + if (outlen == 0) + return 1; + } + + while (outlen > 0) { + fd_set readfds; + + FD_ZERO(&readfds); + FD_SET(sftp_ssh_socket, &readfds); + if (select(1, &readfds, NULL, NULL, NULL) < 0) + return 0; /* doom */ + select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_READ); + } + + return 1; +} +int sftp_senddata(char *buf, int len) +{ + back->send((unsigned char *) buf, len); + return 1; +} + +/* + * Loop through the ssh connection and authentication process. + */ +static void ssh_sftp_init(void) +{ + if (sftp_ssh_socket == INVALID_SOCKET) + return; + while (!back->sendok()) { + fd_set readfds; + FD_ZERO(&readfds); + FD_SET(sftp_ssh_socket, &readfds); + if (select(1, &readfds, NULL, NULL, NULL) < 0) + return; /* doom */ + select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_READ); + } +} + +static char *password = NULL; +static int get_line(const char *prompt, char *str, int maxlen, int is_pw) +{ + HANDLE hin, hout; + DWORD savemode, newmode, i; + + if (password) { + static int tried_once = 0; + + if (tried_once) { + return 0; + } else { + strncpy(str, password, maxlen); + str[maxlen - 1] = '\0'; + tried_once = 1; + return 1; + } + } + + hin = GetStdHandle(STD_INPUT_HANDLE); + hout = GetStdHandle(STD_OUTPUT_HANDLE); + if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) { + fprintf(stderr, "Cannot get standard input/output handles\n"); + exit(1); + } + + GetConsoleMode(hin, &savemode); + newmode = savemode | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT; + if (is_pw) + newmode &= ~ENABLE_ECHO_INPUT; + else + newmode |= ENABLE_ECHO_INPUT; + SetConsoleMode(hin, newmode); + + WriteFile(hout, prompt, strlen(prompt), &i, NULL); + ReadFile(hin, str, maxlen - 1, &i, NULL); + + SetConsoleMode(hin, savemode); + + if ((int) i > maxlen) + i = maxlen - 1; + else + i = i - 2; + str[i] = '\0'; + + if (is_pw) + WriteFile(hout, "\r\n", 2, &i, NULL); + + return 1; +} + +/* + * Initialize the Win$ock driver. + */ +static void init_winsock(void) +{ + WORD winsock_ver; + WSADATA wsadata; + + winsock_ver = MAKEWORD(1, 1); + if (WSAStartup(winsock_ver, &wsadata)) { + fprintf(stderr, "Unable to initialise WinSock"); + exit(1); + } + if (LOBYTE(wsadata.wVersion) != 1 || HIBYTE(wsadata.wVersion) != 1) { + fprintf(stderr, "WinSock version is incompatible with 1.1"); + exit(1); + } +} + +/* + * Short description of parameters. + */ +static void usage(void) +{ + printf("PuTTY Secure File Transfer (SFTP) client\n"); + printf("%s\n", ver); + printf("Usage: psftp [options] user@host\n"); + printf("Options:\n"); + printf(" -b file use specified batchfile\n"); + printf(" -bc output batchfile commands\n"); + printf(" -be don't stop batchfile processing if errors\n"); + printf(" -v show verbose messages\n"); + printf(" -P port connect to specified port\n"); + printf(" -pw passw login with specified password\n"); + exit(1); +} + +/* + * Connect to a host. + */ +static int psftp_connect(char *userhost, char *user, int portnumber) +{ + char *host, *realhost; + char *err; + + /* Separate host and username */ + host = userhost; + host = strrchr(host, '@'); + if (host == NULL) { + host = userhost; + } else { + *host++ = '\0'; + if (user) { + printf("psftp: multiple usernames specified; using \"%s\"\n", + user); + } else + user = userhost; + } + + /* Try to load settings for this host */ + do_defaults(host, &cfg); + if (cfg.host[0] == '\0') { + /* No settings for this host; use defaults */ + do_defaults(NULL, &cfg); + strncpy(cfg.host, host, sizeof(cfg.host) - 1); + cfg.host[sizeof(cfg.host) - 1] = '\0'; + cfg.port = 22; + } + + /* + * Trim leading whitespace off the hostname if it's there. + */ + { + int space = strspn(cfg.host, " \t"); + memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space); } - /* ------------------------------------------------------------------ - * We've received an exit command. Tidy up and leave. + /* See if host is of the form user@host */ + if (cfg.host[0] != '\0') { + char *atsign = strchr(cfg.host, '@'); + /* Make sure we're not overflowing the user field */ + if (atsign) { + if (atsign - cfg.host < sizeof cfg.username) { + strncpy(cfg.username, cfg.host, atsign - cfg.host); + cfg.username[atsign - cfg.host] = '\0'; + } + memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1)); + } + } + + /* + * Trim a colon suffix off the hostname if it's there. */ - io_finish(); + cfg.host[strcspn(cfg.host, ":")] = '\0'; + + /* Set username */ + if (user != NULL && user[0] != '\0') { + strncpy(cfg.username, user, sizeof(cfg.username) - 1); + cfg.username[sizeof(cfg.username) - 1] = '\0'; + } + if (!cfg.username[0]) { + printf("login as: "); + if (!fgets(cfg.username, sizeof(cfg.username), stdin)) { + fprintf(stderr, "psftp: aborting\n"); + exit(1); + } else { + int len = strlen(cfg.username); + if (cfg.username[len - 1] == '\n') + cfg.username[len - 1] = '\0'; + } + } + + if (cfg.protocol != PROT_SSH) + cfg.port = 22; + + if (portnumber) + cfg.port = portnumber; + + /* SFTP uses SSH2 by default always */ + cfg.sshprot = 2; + + /* + * Disable scary things which shouldn't be enabled for simple + * things like SCP and SFTP: agent forwarding, port forwarding, + * X forwarding. + */ + cfg.x11_forward = 0; + cfg.agentfwd = 0; + cfg.portfwd[0] = cfg.portfwd[1] = '\0'; + + /* Set up subsystem name. */ + strcpy(cfg.remote_cmd, "sftp"); + cfg.ssh_subsys = TRUE; + cfg.nopty = TRUE; + + /* + * Set up fallback option, for SSH1 servers or servers with the + * sftp subsystem not enabled but the server binary installed + * in the usual place. We only support fallback on Unix + * systems, and we use a kludgy piece of shellery which should + * try to find sftp-server in various places (the obvious + * systemwide spots /usr/lib and /usr/local/lib, and then the + * user's PATH) and finally give up. + * + * test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server + * test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server + * exec sftp-server + * + * the idea being that this will attempt to use either of the + * obvious pathnames and then give up, and when it does give up + * it will print the preferred pathname in the error messages. + */ + cfg.remote_cmd_ptr2 = + "test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n" + "test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n" + "exec sftp-server"; + cfg.ssh_subsys2 = FALSE; + + back = &ssh_backend; + + err = back->init(cfg.host, cfg.port, &realhost, 0); + if (err != NULL) { + fprintf(stderr, "ssh_init: %s\n", err); + return 1; + } + ssh_sftp_init(); + if (verbose && realhost != NULL) + printf("Connected to %s\n", realhost); + return 0; } -int main(void) { - io_init(); - do_sftp(); +/* + * Main program. Parse arguments etc. + */ +int main(int argc, char *argv[]) +{ + int i; + int portnumber = 0; + char *userhost, *user; + int mode = 0; + int modeflags = 0; + char *batchfile = NULL; + + flags = FLAG_STDERR | FLAG_INTERACTIVE; + ssh_get_line = &get_line; + init_winsock(); + sk_init(); + + userhost = user = NULL; + + for (i = 1; i < argc; i++) { + if (argv[i][0] != '-') { + if (userhost) + usage(); + else + userhost = dupstr(argv[i]); + } else if (strcmp(argv[i], "-v") == 0) { + verbose = 1, flags |= FLAG_VERBOSE; + } else if (strcmp(argv[i], "-h") == 0 || + strcmp(argv[i], "-?") == 0) { + usage(); + } else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) { + user = argv[++i]; + } else if (strcmp(argv[i], "-P") == 0 && i + 1 < argc) { + portnumber = atoi(argv[++i]); + } else if (strcmp(argv[i], "-pw") == 0 && i + 1 < argc) { + password = argv[++i]; + } else if (strcmp(argv[i], "-b") == 0 && i + 1 < argc) { + mode = 1; + batchfile = argv[++i]; + } else if (strcmp(argv[i], "-bc") == 0 && i + 1 < argc) { + modeflags = modeflags | 1; + } else if (strcmp(argv[i], "-be") == 0 && i + 1 < argc) { + modeflags = modeflags | 2; + } else if (strcmp(argv[i], "--") == 0) { + i++; + break; + } else { + usage(); + } + } + argc -= i; + argv += i; + back = NULL; + + /* + * If a user@host string has already been provided, connect to + * it now. + */ + if (userhost) { + if (psftp_connect(userhost, user, portnumber)) + return 1; + do_sftp_init(); + } else { + printf("psftp: no hostname specified; use \"open host.name\"" + " to connect\n"); + } + + do_sftp(mode, modeflags, batchfile); + + if (back != NULL && back->socket() != NULL) { + char ch; + back->special(TS_EOF); + sftp_recvdata(&ch, 1); + } + WSACleanup(); + random_save_seed(); + return 0; }