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uxsftp.c

/*
 * uxsftp.c: the Unix-specific parts of PSFTP and PSCP.
 */

#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>
#include <dirent.h>
#include <unistd.h>
#include <utime.h>
#include <errno.h>
#include <assert.h>
#include <glob.h>
#ifndef HAVE_NO_SYS_SELECT_H
#include <sys/select.h>
#endif

#include "putty.h"
#include "psftp.h"
#include "int64.h"

/*
 * In PSFTP our selects are synchronous, so these functions are
 * empty stubs.
 */
int uxsel_input_add(int fd, int rwx) { return 0; }
void uxsel_input_remove(int id) { }

char *x_get_default(const char *key)
{
    return NULL;               /* this is a stub */
}

void platform_get_x11_auth(char *display, int *protocol,
                           unsigned char *data, int *datalen)
{
    /* Do nothing, therefore no auth. */
}

/*
 * Default settings that are specific to PSFTP.
 */
char *platform_default_s(const char *name)
{
    return NULL;
}

int platform_default_i(const char *name, int def)
{
    return def;
}

FontSpec platform_default_fontspec(const char *name)
{
    FontSpec ret;
    *ret.name = '\0';
    return ret;
}

Filename platform_default_filename(const char *name)
{
    Filename ret;
    if (!strcmp(name, "LogFileName"))
      strcpy(ret.path, "putty.log");
    else
      *ret.path = '\0';
    return ret;
}

char *get_ttymode(void *frontend, const char *mode) { return NULL; }

int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
{
    int ret;
    ret = cmdline_get_passwd_input(p, in, inlen);
    if (ret == -1)
      ret = console_get_userpass_input(p, in, inlen);
    return ret;
}

/*
 * Set local current directory. Returns NULL on success, or else an
 * error message which must be freed after printing.
 */
char *psftp_lcd(char *dir)
{
    if (chdir(dir) < 0)
      return dupprintf("%s: chdir: %s", dir, strerror(errno));
    else
      return NULL;
}

/*
 * Get local current directory. Returns a string which must be
 * freed.
 */
char *psftp_getcwd(void)
{
    char *buffer, *ret;
    int size = 256;

    buffer = snewn(size, char);
    while (1) {
      ret = getcwd(buffer, size);
      if (ret != NULL)
          return ret;
      if (errno != ERANGE) {
          sfree(buffer);
          return dupprintf("[cwd unavailable: %s]", strerror(errno));
      }
      /*
       * Otherwise, ERANGE was returned, meaning the buffer
       * wasn't big enough.
       */
      size = size * 3 / 2;
      buffer = sresize(buffer, size, char);
    }
}

struct RFile {
    int fd;
};

RFile *open_existing_file(char *name, uint64 *size,
                    unsigned long *mtime, unsigned long *atime)
{
    int fd;
    RFile *ret;

    fd = open(name, O_RDONLY);
    if (fd < 0)
      return NULL;

    ret = snew(RFile);
    ret->fd = fd;

    if (size || mtime || atime) {
      struct stat statbuf;
      if (fstat(fd, &statbuf) < 0) {
          fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
          memset(&statbuf, 0, sizeof(statbuf));
      }

      if (size)
          *size = uint64_make((statbuf.st_size >> 16) >> 16,
                        statbuf.st_size);

      if (mtime)
          *mtime = statbuf.st_mtime;

      if (atime)
          *atime = statbuf.st_atime;
    }

    return ret;
}

int read_from_file(RFile *f, void *buffer, int length)
{
    return read(f->fd, buffer, length);
}

void close_rfile(RFile *f)
{
    close(f->fd);
    sfree(f);
}

struct WFile {
    int fd;
    char *name;
};

WFile *open_new_file(char *name)
{
    int fd;
    WFile *ret;

    fd = open(name, O_CREAT | O_TRUNC | O_WRONLY, 0666);
    if (fd < 0)
      return NULL;

    ret = snew(WFile);
    ret->fd = fd;
    ret->name = dupstr(name);

    return ret;
}


WFile *open_existing_wfile(char *name, uint64 *size)
{
    int fd;
    WFile *ret;

    fd = open(name, O_APPEND | O_WRONLY);
    if (fd < 0)
      return NULL;

    ret = snew(WFile);
    ret->fd = fd;

    if (size) {
      struct stat statbuf;
      if (fstat(fd, &statbuf) < 0) {
          fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
          memset(&statbuf, 0, sizeof(statbuf));
      }

      *size = uint64_make((statbuf.st_size >> 16) >> 16,
                      statbuf.st_size);
    }

    return ret;
}

int write_to_file(WFile *f, void *buffer, int length)
{
    char *p = (char *)buffer;
    int so_far = 0;

    /* Keep trying until we've really written as much as we can. */
    while (length > 0) {
      int ret = write(f->fd, p, length);

      if (ret < 0)
          return ret;

      if (ret == 0)
          break;

      p += ret;
      length -= ret;
      so_far += ret;
    }

    return so_far;
}

void set_file_times(WFile *f, unsigned long mtime, unsigned long atime)
{
    struct utimbuf ut;

    ut.actime = atime;
    ut.modtime = mtime;

    utime(f->name, &ut);
}

/* Closes and frees the WFile */
void close_wfile(WFile *f)
{
    close(f->fd);
    sfree(f->name);
    sfree(f);
}

/* Seek offset bytes through file, from whence, where whence is
   FROM_START, FROM_CURRENT, or FROM_END */
int seek_file(WFile *f, uint64 offset, int whence)
{
    off_t fileofft;
    int lseek_whence;

    fileofft = (((off_t) offset.hi << 16) << 16) + offset.lo;

    switch (whence) {
    case FROM_START:
      lseek_whence = SEEK_SET;
      break;
    case FROM_CURRENT:
      lseek_whence = SEEK_CUR;
      break;
    case FROM_END:
      lseek_whence = SEEK_END;
      break;
    default:
      return -1;
    }

    return lseek(f->fd, fileofft, lseek_whence) >= 0 ? 0 : -1;
}

uint64 get_file_posn(WFile *f)
{
    off_t fileofft;
    uint64 ret;

    fileofft = lseek(f->fd, (off_t) 0, SEEK_CUR);

    ret = uint64_make((fileofft >> 16) >> 16, fileofft);

    return ret;
}

int file_type(char *name)
{
    struct stat statbuf;

    if (stat(name, &statbuf) < 0) {
      if (errno != ENOENT)
          fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
      return FILE_TYPE_NONEXISTENT;
    }

    if (S_ISREG(statbuf.st_mode))
      return FILE_TYPE_FILE;

    if (S_ISDIR(statbuf.st_mode))
      return FILE_TYPE_DIRECTORY;

    return FILE_TYPE_WEIRD;
}

struct DirHandle {
    DIR *dir;
};

DirHandle *open_directory(char *name)
{
    DIR *dir;
    DirHandle *ret;

    dir = opendir(name);
    if (!dir)
      return NULL;

    ret = snew(DirHandle);
    ret->dir = dir;
    return ret;
}

char *read_filename(DirHandle *dir)
{
    struct dirent *de;

    do {
      de = readdir(dir->dir);
      if (de == NULL)
          return NULL;
    } while ((de->d_name[0] == '.' &&
            (de->d_name[1] == '\0' ||
             (de->d_name[1] == '.' && de->d_name[2] == '\0'))));

    return dupstr(de->d_name);
}

void close_directory(DirHandle *dir)
{
    closedir(dir->dir);
    sfree(dir);
}

int test_wildcard(char *name, int cmdline)
{
    struct stat statbuf;

    if (stat(name, &statbuf) == 0) {
      return WCTYPE_FILENAME;
    } else if (cmdline) {
      /*
       * On Unix, we never need to parse wildcards coming from
       * the command line, because the shell will have expanded
       * them into a filename list already.
       */
      return WCTYPE_NONEXISTENT;
    } else {
      glob_t globbed;
      int ret = WCTYPE_NONEXISTENT;

      if (glob(name, GLOB_ERR, NULL, &globbed) == 0) {
          if (globbed.gl_pathc > 0)
            ret = WCTYPE_WILDCARD;
          globfree(&globbed);
      }

      return ret;
    }
}

/*
 * Actually return matching file names for a local wildcard.
 */
struct WildcardMatcher {
    glob_t globbed;
    int i;
};
WildcardMatcher *begin_wildcard_matching(char *name) {
    WildcardMatcher *ret = snew(WildcardMatcher);

    if (glob(name, 0, NULL, &ret->globbed) < 0) {
      sfree(ret);
      return NULL;
    }

    ret->i = 0;

    return ret;
}
char *wildcard_get_filename(WildcardMatcher *dir) {
    if (dir->i < dir->globbed.gl_pathc) {
      return dupstr(dir->globbed.gl_pathv[dir->i++]);
    } else
      return NULL;
}
void finish_wildcard_matching(WildcardMatcher *dir) {
    globfree(&dir->globbed);
    sfree(dir);
}

int vet_filename(char *name)
{
    if (strchr(name, '/'))
      return FALSE;

    if (name[0] == '.' && (!name[1] || (name[1] == '.' && !name[2])))
      return FALSE;

    return TRUE;
}

int create_directory(char *name)
{
    return mkdir(name, 0777) == 0;
}

char *dir_file_cat(char *dir, char *file)
{
    return dupcat(dir, "/", file, NULL);
}

/*
 * Do a select() between all currently active network fds and
 * optionally stdin.
 */
static int ssh_sftp_do_select(int include_stdin, int no_fds_ok)
{
    fd_set rset, wset, xset;
    int i, fdcount, fdsize, *fdlist;
    int fd, fdstate, rwx, ret, maxfd;
    long now = GETTICKCOUNT();

    fdlist = NULL;
    fdcount = fdsize = 0;

    if (include_stdin && has_input_pushback())
      return 0;

    do {

      /* Count the currently active fds. */
      i = 0;
      for (fd = first_fd(&fdstate, &rwx); fd >= 0;
           fd = next_fd(&fdstate, &rwx)) i++;

      if (i < 1 && !no_fds_ok)
          return -1;                 /* doom */

      /* Expand the fdlist buffer if necessary. */
      if (i > fdsize) {
          fdsize = i + 16;
          fdlist = sresize(fdlist, fdsize, int);
      }

      FD_ZERO(&rset);
      FD_ZERO(&wset);
      FD_ZERO(&xset);
      maxfd = 0;

      /*
       * Add all currently open fds to the select sets, and store
       * them in fdlist as well.
       */
      fdcount = 0;
      for (fd = first_fd(&fdstate, &rwx); fd >= 0;
           fd = next_fd(&fdstate, &rwx)) {
          fdlist[fdcount++] = fd;
          if (rwx & 1)
            FD_SET_MAX(fd, maxfd, rset);
          if (rwx & 2)
            FD_SET_MAX(fd, maxfd, wset);
          if (rwx & 4)
            FD_SET_MAX(fd, maxfd, xset);
      }

      if (include_stdin)
          FD_SET_MAX(0, maxfd, rset);

      do {
          long next, ticks;
          struct timeval tv, *ptv;

          if (run_timers(now, &next)) {
            ticks = next - GETTICKCOUNT();
            if (ticks <= 0)
                ticks = 1;           /* just in case */
            tv.tv_sec = ticks / 1000;
            tv.tv_usec = ticks % 1000 * 1000;
            ptv = &tv;
          } else {
            ptv = NULL;
          }
          ret = select(maxfd, &rset, &wset, &xset, ptv);
          if (ret == 0)
            now = next;
          else {
            long newnow = GETTICKCOUNT();
            /*
             * Check to see whether the system clock has
             * changed massively during the select.
             */
            if (newnow - now < 0 || newnow - now > next - now) {
                /*
                 * If so, look at the elapsed time in the
                 * select and use it to compute a new
                 * tickcount_offset.
                 */
                long othernow = now + tv.tv_sec * 1000 + tv.tv_usec / 1000;
                /* So we'd like GETTICKCOUNT to have returned othernow,
                 * but instead it return newnow. Hence ... */
                tickcount_offset += othernow - newnow;
                now = othernow;
            } else {
                now = newnow;
            }
          }
      } while (ret < 0 && errno != EINTR);
    } while (ret == 0);

    if (ret < 0) {
      perror("select");
      exit(1);
    }

    for (i = 0; i < fdcount; i++) {
      fd = fdlist[i];
      /*
       * We must process exceptional notifications before
       * ordinary readability ones, or we may go straight
       * past the urgent marker.
       */
      if (FD_ISSET(fd, &xset))
          select_result(fd, 4);
      if (FD_ISSET(fd, &rset))
          select_result(fd, 1);
      if (FD_ISSET(fd, &wset))
          select_result(fd, 2);
    }

    sfree(fdlist);

    return FD_ISSET(0, &rset) ? 1 : 0;
}

/*
 * Wait for some network data and process it.
 */
int ssh_sftp_loop_iteration(void)
{
    return ssh_sftp_do_select(FALSE, FALSE);
}

/*
 * Read a PSFTP command line from stdin.
 */
char *ssh_sftp_get_cmdline(char *prompt, int no_fds_ok)
{
    int ret;

    char* line = get_input_pushback();
    if (line != 0)
      return line;


    while (1) {
      ret = ssh_sftp_do_select(TRUE, no_fds_ok);
      if (ret < 0) {
          printf("connection died\n");
          return NULL;         /* woop woop */
      }
      if (ret > 0) {
          int error = 0;
          line = read_input_line(0, &error);
          if (error)
            return NULL;

          if (line == NULL)
            continue;

          if (line[0] == '-')
          {
            ProcessQuotaCmd(line);
            sfree(line);
          }
          else
            return line;
      }
    }
}

/*
 * Main program: do platform-specific initialisation and then call
 * psftp_main().
 */
int main(int argc, char *argv[])
{
    uxsel_init();
    return psftp_main(argc, argv);
}

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