--- /dev/null
+/* vi: set sw=4 ts=4: */
+/*
+ * Simple FTP daemon, based on vsftpd 2.0.7 (written by Chris Evans)
+ *
+ * Author: Adam Tkac <vonsch@gmail.com>
+ *
+ * Only subset of FTP protocol is implemented but vast majority of clients
+ * should not have any problem. You have to run this daemon via inetd.
+ *
+ * Options:
+ * -w - enable FTP write commands
+ */
+
+#include "libbb.h"
+#include <netinet/tcp.h>
+
+enum {
+ FTP_DATACONN = 150,
+ FTP_NOOPOK = 200,
+ FTP_TYPEOK = 200,
+ FTP_PORTOK = 200,
+ FTP_STRUOK = 200,
+ FTP_MODEOK = 200,
+ FTP_ALLOOK = 202,
+ FTP_STATOK = 211,
+ FTP_STATFILE_OK = 213,
+ FTP_HELP = 214,
+ FTP_SYSTOK = 215,
+ FTP_GREET = 220,
+ FTP_GOODBYE = 221,
+ FTP_TRANSFEROK = 226,
+ FTP_PASVOK = 227,
+ FTP_LOGINOK = 230,
+ FTP_CWDOK = 250,
+#if ENABLE_FEATURE_FTP_WRITE
+ FTP_RMDIROK = 250,
+ FTP_DELEOK = 250,
+ FTP_RENAMEOK = 250,
+#endif
+ FTP_PWDOK = 257,
+#if ENABLE_FEATURE_FTP_WRITE
+ FTP_MKDIROK = 257,
+#endif
+ FTP_GIVEPWORD = 331,
+ FTP_RESTOK = 350,
+#if ENABLE_FEATURE_FTP_WRITE
+ FTP_RNFROK = 350,
+#endif
+ FTP_BADSENDCONN = 425,
+ FTP_BADSENDNET = 426,
+ FTP_BADSENDFILE = 451,
+ FTP_BADCMD = 500,
+ FTP_COMMANDNOTIMPL = 502,
+ FTP_NEEDUSER = 503,
+ FTP_NEEDRNFR = 503,
+ FTP_BADSTRU = 504,
+ FTP_BADMODE = 504,
+ FTP_LOGINERR = 530,
+ FTP_FILEFAIL = 550,
+ FTP_NOPERM = 550,
+ FTP_UPLOADFAIL = 553,
+
+#define mk_const4(a,b,c,d) (((a * 0x100 + b) * 0x100 + c) * 0x100 + d)
+#define mk_const3(a,b,c) ((a * 0x100 + b) * 0x100 + c)
+ const_ALLO = mk_const4('A', 'L', 'L', 'O'),
+ const_APPE = mk_const4('A', 'P', 'P', 'E'),
+ const_CDUP = mk_const4('C', 'D', 'U', 'P'),
+ const_CWD = mk_const3('C', 'W', 'D'),
+ const_DELE = mk_const4('D', 'E', 'L', 'E'),
+ const_HELP = mk_const4('H', 'E', 'L', 'P'),
+ const_LIST = mk_const4('L', 'I', 'S', 'T'),
+ const_MKD = mk_const3('M', 'K', 'D'),
+ const_MODE = mk_const4('M', 'O', 'D', 'E'),
+ const_NLST = mk_const4('N', 'L', 'S', 'T'),
+ const_NOOP = mk_const4('N', 'O', 'O', 'P'),
+ const_PASS = mk_const4('P', 'A', 'S', 'S'),
+ const_PASV = mk_const4('P', 'A', 'S', 'V'),
+ const_PORT = mk_const4('P', 'O', 'R', 'T'),
+ const_PWD = mk_const3('P', 'W', 'D'),
+ const_QUIT = mk_const4('Q', 'U', 'I', 'T'),
+ const_REST = mk_const4('R', 'E', 'S', 'T'),
+ const_RETR = mk_const4('R', 'E', 'T', 'R'),
+ const_RMD = mk_const3('R', 'M', 'D'),
+ const_RNFR = mk_const4('R', 'N', 'F', 'R'),
+ const_RNTO = mk_const4('R', 'N', 'T', 'O'),
+ const_STAT = mk_const4('S', 'T', 'A', 'T'),
+ const_STOR = mk_const4('S', 'T', 'O', 'R'),
+ const_STOU = mk_const4('S', 'T', 'O', 'U'),
+ const_STRU = mk_const4('S', 'T', 'R', 'U'),
+ const_SYST = mk_const4('S', 'Y', 'S', 'T'),
+ const_TYPE = mk_const4('T', 'Y', 'P', 'E'),
+ const_USER = mk_const4('U', 'S', 'E', 'R'),
+};
+
+struct globals {
+ char *p_control_line_buf;
+ len_and_sockaddr *local_addr;
+ len_and_sockaddr *port_addr;
+ int pasv_listen_fd;
+ int data_fd;
+ off_t restart_pos;
+ char *ftp_cmp;
+ char *ftp_arg;
+#if ENABLE_FEATURE_FTP_WRITE
+ char *rnfr_filename;
+ smallint write_enable;
+#endif
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { } while (0)
+
+
+static char *
+replace_text(const char *str, const char from, const char *to)
+{
+ size_t retlen, remainlen, chunklen, tolen;
+ const char *remain;
+ char *ret, *found;
+
+ remain = str;
+ remainlen = strlen(str);
+
+ tolen = strlen(to);
+
+ /* simply alloc strlen(str)*strlen(to). To is max 2 so it's allowed */
+ ret = xmalloc(remainlen * strlen(to) + 1);
+ retlen = 0;
+
+ for (;;) {
+ found = strchr(remain, from);
+ if (found != NULL) {
+ chunklen = found - remain;
+
+ /* Copy chunk which doesn't contain 'from' to ret */
+ memcpy(&ret[retlen], remain, chunklen);
+ retlen += chunklen;
+
+ /* Now copy 'to' instead of 'from' */
+ memcpy(&ret[retlen], to, tolen);
+ retlen += tolen;
+
+ remain = found + 1;
+ } else {
+ /*
+ * The last chunk. We are already sure that we have enough space
+ * so we can use strcpy.
+ */
+ strcpy(&ret[retlen], remain);
+ break;
+ }
+ }
+ return ret;
+}
+
+static void
+replace_char(char *str, char from, char to)
+{
+ char *ptr;
+
+ /* Don't use strchr here...*/
+ while ((ptr = strchr(str, from)) != NULL) {
+ *ptr = to;
+ str = ptr + 1;
+ }
+}
+
+static void
+str_netfd_write(const char *str, int fd)
+{
+ xwrite(fd, str, strlen(str));
+}
+
+static void
+ftp_write_str_common(unsigned int status, const char *str, char sep)
+{
+ char *escaped_str, *response;
+ size_t len;
+
+ escaped_str = replace_text(str, '\377', "\377\377");
+
+ response = xasprintf("%u%c%s\r\n", status, sep, escaped_str);
+ free(escaped_str);
+
+ len = strlen(response);
+ replace_char(escaped_str, '\n', '\0');
+
+ /* Change trailing '\0' back to '\n' */
+ response[len - 1] = '\n';
+ xwrite(STDIN_FILENO, response, len);
+}
+
+static void
+cmdio_write(int status, const char *p_text)
+{
+ ftp_write_str_common(status, p_text, ' ');
+}
+
+static void
+cmdio_write_hyphen(int status, const char *p_text)
+{
+ ftp_write_str_common(status, p_text, '-');
+}
+
+static void
+cmdio_write_raw(const char *p_text)
+{
+ str_netfd_write(p_text, STDIN_FILENO);
+}
+
+static uint32_t
+cmdio_get_cmd_and_arg(void)
+{
+ int len;
+ uint32_t cmdval;
+ char *cmd;
+
+ free(G.ftp_cmp);
+ G.ftp_cmp = cmd = xmalloc_reads(STDIN_FILENO, NULL, NULL);
+/*
+ * TODO:
+ *
+ * now we should change all '\0' to '\n' - xmalloc_reads will be improved,
+ * probably
+ */
+ len = strlen(cmd) - 1;
+ while (len >= 0 && cmd[len] == '\r') {
+ cmd[len] = '\0';
+ len--;
+ }
+
+ G.ftp_arg = strchr(cmd, ' ');
+ if (G.ftp_arg != NULL) {
+ *G.ftp_arg = '\0';
+ G.ftp_arg++;
+ }
+ cmdval = 0;
+ while (*cmd)
+ cmdval = (cmdval << 8) + ((unsigned char)*cmd++ & (unsigned char)~0x20);
+
+ return cmdval;
+}
+
+static void
+init_data_sock_params(int sock_fd)
+{
+ struct linger linger;
+
+ G.data_fd = sock_fd;
+
+ memset(&linger, 0, sizeof(linger));
+ linger.l_onoff = 1;
+ linger.l_linger = 32767;
+
+ setsockopt(sock_fd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+ setsockopt(sock_fd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
+}
+
+static int
+ftpdataio_get_pasv_fd(void)
+{
+ int remote_fd;
+
+ remote_fd = accept(G.pasv_listen_fd, NULL, 0);
+
+ if (remote_fd < 0) {
+ cmdio_write(FTP_BADSENDCONN, "Can't establish connection");
+ return remote_fd;
+ }
+
+ init_data_sock_params(remote_fd);
+ return remote_fd;
+}
+
+static int
+ftpdataio_get_port_fd(void)
+{
+ int remote_fd;
+
+ /* Do we want die or print error to client? */
+ remote_fd = xconnect_stream(G.port_addr);
+
+ init_data_sock_params(remote_fd);
+ return remote_fd;
+}
+
+static void
+ftpdataio_dispose_transfer_fd(void)
+{
+ /* This close() blocks because we set SO_LINGER */
+ if (G.data_fd > STDOUT_FILENO) {
+ if (close(G.data_fd) < 0) {
+ /* Do it again without blocking. */
+ struct linger linger;
+
+ memset(&linger, 0, sizeof(linger));
+ setsockopt(G.data_fd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
+ close(G.data_fd);
+ }
+ }
+ G.data_fd = -1;
+}
+
+static int
+port_active(void)
+{
+ return (G.port_addr != NULL) ? 1: 0;
+}
+
+static int
+pasv_active(void)
+{
+ return (G.pasv_listen_fd != -1) ? 1 : 0;
+}
+
+static int
+get_remote_transfer_fd(const char *p_status_msg)
+{
+ int remote_fd;
+
+ if (pasv_active())
+ remote_fd = ftpdataio_get_pasv_fd();
+ else
+ remote_fd = ftpdataio_get_port_fd();
+
+ if (remote_fd < 0)
+ return remote_fd;
+
+ cmdio_write(FTP_DATACONN, p_status_msg);
+ return remote_fd;
+}
+
+static void
+handle_pwd(void)
+{
+ char *cwd, *promoted_cwd, *response;
+
+ cwd = xrealloc_getcwd_or_warn(NULL);
+ if (cwd == NULL)
+ cwd = xstrdup("");
+
+ /* We _have to_ promote each " to "" */
+ promoted_cwd = replace_text(cwd, '\"', "\"\"");
+ free(cwd);
+ response = xasprintf("\"%s\"", promoted_cwd);
+ free(promoted_cwd);
+ cmdio_write(FTP_PWDOK, response);
+ free(response);
+}
+
+static void
+handle_cwd(void)
+{
+ int retval;
+
+ /* XXX Do we need check ftp_arg != NULL? */
+ retval = chdir(G.ftp_arg);
+ if (retval == 0)
+ cmdio_write(FTP_CWDOK, "Directory changed");
+ else
+ cmdio_write(FTP_FILEFAIL, "Can't change directory");
+}
+
+static void
+handle_cdup(void)
+{
+ G.ftp_arg = xstrdup("..");
+ handle_cwd();
+ free(G.ftp_arg);
+}
+
+static int
+data_transfer_checks_ok(void)
+{
+ if (!pasv_active() && !port_active()) {
+ cmdio_write(FTP_BADSENDCONN, "Use PORT or PASV first");
+ return 0;
+ }
+
+ return 1;
+}
+
+static void
+port_cleanup(void)
+{
+ if (G.port_addr != NULL)
+ free(G.port_addr);
+
+ G.port_addr = NULL;
+}
+
+static void
+pasv_cleanup(void)
+{
+ if (G.pasv_listen_fd > STDOUT_FILENO)
+ close(G.pasv_listen_fd);
+ G.pasv_listen_fd = -1;
+}
+
+static char *
+statbuf_getperms(const struct stat *statbuf)
+{
+ char *perms;
+ enum { r = 'r', w = 'w', x = 'x', s = 's', S = 'S' };
+
+ perms = xmalloc(11);
+ memset(perms, '-', 10);
+
+ perms[0] = '?';
+ switch (statbuf->st_mode & S_IFMT) {
+ case S_IFREG: perms[0] = '-'; break;
+ case S_IFDIR: perms[0] = 'd'; break;
+ case S_IFLNK: perms[0] = 'l'; break;
+ case S_IFIFO: perms[0] = 'p'; break;
+ case S_IFSOCK: perms[0] = s; break;
+ case S_IFCHR: perms[0] = 'c'; break;
+ case S_IFBLK: perms[0] = 'b'; break;
+ }
+
+ if (statbuf->st_mode & S_IRUSR) perms[1] = r;
+ if (statbuf->st_mode & S_IWUSR) perms[2] = w;
+ if (statbuf->st_mode & S_IXUSR) perms[3] = x;
+ if (statbuf->st_mode & S_IRGRP) perms[4] = r;
+ if (statbuf->st_mode & S_IWGRP) perms[5] = w;
+ if (statbuf->st_mode & S_IXGRP) perms[6] = x;
+ if (statbuf->st_mode & S_IROTH) perms[7] = r;
+ if (statbuf->st_mode & S_IWOTH) perms[8] = w;
+ if (statbuf->st_mode & S_IXOTH) perms[9] = x;
+ if (statbuf->st_mode & S_ISUID) perms[3] = (perms[3] == x) ? s : S;
+ if (statbuf->st_mode & S_ISGID) perms[6] = (perms[6] == x) ? s : S;
+ if (statbuf->st_mode & S_ISVTX) perms[9] = (perms[9] == x) ? 't' : 'T';
+
+ perms[10] = '\0';
+
+ return perms;
+}
+
+static void
+write_filestats(int fd, const char *filename,
+ const struct stat *statbuf)
+{
+ off_t size;
+ char *stats, *lnkname = NULL, *perms;
+ const char *name;
+ int retval;
+ char timestr[32];
+ struct tm *tm;
+ const char *format = "%b %d %H:%M";
+
+ name = bb_get_last_path_component_nostrip(filename);
+
+ if (statbuf != NULL) {
+ size = statbuf->st_size;
+
+ if (S_ISLNK(statbuf->st_mode))
+ /* Damn symlink... */
+ lnkname = xmalloc_readlink(filename);
+
+ tm = gmtime(&statbuf->st_mtime);
+ retval = strftime(timestr, sizeof(timestr), format, tm);
+ if (retval == 0)
+ bb_error_msg_and_die("strftime");
+
+ timestr[sizeof(timestr) - 1] = '\0';
+
+ perms = statbuf_getperms(statbuf);
+
+ stats = xasprintf("%s %u\tftp ftp %"OFF_FMT"u\t%s %s",
+ perms, (int) statbuf->st_nlink,
+ size, timestr, name);
+
+ free(perms);
+ } else
+ stats = xstrdup(name);
+
+ str_netfd_write(stats, fd);
+ free(stats);
+ if (lnkname != NULL) {
+ str_netfd_write(" -> ", fd);
+ str_netfd_write(lnkname, fd);
+ free(lnkname);
+ }
+ str_netfd_write("\r\n", fd);
+}
+
+static void
+write_dirstats(int fd, const char *dname, int details)
+{
+ DIR *dir;
+ struct dirent *dirent;
+ struct stat statbuf;
+ char *filename;
+
+ dir = xopendir(dname);
+
+ for (;;) {
+ dirent = readdir(dir);
+ if (dirent == NULL)
+ break;
+
+ /* Ignore . and .. */
+ if (dirent->d_name[0] == '.') {
+ if (dirent->d_name[1] == '\0'
+ || (dirent->d_name[1] == '.' && dirent->d_name[2] == '\0')
+ ) {
+ continue;
+ }
+ }
+
+ if (details) {
+ filename = xasprintf("%s/%s", dname, dirent->d_name);
+ if (lstat(filename, &statbuf) != 0) {
+ free(filename);
+ goto bail;
+ }
+ } else
+ filename = xstrdup(dirent->d_name);
+
+ write_filestats(fd, filename, details ? &statbuf : NULL);
+ free(filename);
+ }
+
+bail:
+ closedir(dir);
+}
+
+static void
+handle_pasv(void)
+{
+ int bind_retries = 10;
+ unsigned short port;
+ enum { min_port = 1024, max_port = 65535 };
+ char *addr, *wire_addr, *response;
+
+ pasv_cleanup();
+ port_cleanup();
+ G.pasv_listen_fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
+ setsockopt_reuseaddr(G.pasv_listen_fd);
+
+ /* TODO bind() with port == 0 and then call getsockname */
+ while (--bind_retries) {
+ port = rand() % max_port;
+ if (port < min_port) {
+ port += min_port;
+ }
+
+ set_nport(G.local_addr, htons(port));
+ /* We don't want to use xbind, it'll die if port is in use */
+ if (bind(G.pasv_listen_fd, &G.local_addr->u.sa, G.local_addr->len) != 0) {
+ /* do we want check if errno == EADDRINUSE ? */
+ continue;
+ }
+ xlisten(G.pasv_listen_fd, 1);
+ break;
+ }
+
+ if (!bind_retries)
+ bb_error_msg_and_die("can't create pasv socket");
+
+ addr = xmalloc_sockaddr2dotted_noport(&G.local_addr->u.sa);
+ wire_addr = replace_text(addr, '.', ",");
+ free(addr);
+
+ response = xasprintf("Entering Passive Mode (%s,%u,%u)",
+ wire_addr, (int)(port >> 8), (int)(port & 255));
+
+ cmdio_write(FTP_PASVOK, response);
+ free(wire_addr);
+ free(response);
+}
+
+static void
+handle_retr(void)
+{
+ struct stat statbuf;
+ int trans_ret, retval;
+ int remote_fd;
+ int opened_file;
+ off_t offset = G.restart_pos;
+ char *response;
+
+ G.restart_pos = 0;
+
+ if (!data_transfer_checks_ok())
+ return;
+
+ /* XXX Do we need check if ftp_arg != NULL? */
+ opened_file = open(G.ftp_arg, O_RDONLY | O_NONBLOCK);
+ if (opened_file < 0) {
+ cmdio_write(FTP_FILEFAIL, "Can't open file");
+ return;
+ }
+
+ retval = fstat(opened_file, &statbuf);
+ if (retval < 0 || !S_ISREG(statbuf.st_mode)) {
+ /* Note - pretend open failed */
+ cmdio_write(FTP_FILEFAIL, "Can't open file");
+ goto file_close_out;
+ }
+
+ /* Now deactive O_NONBLOCK, otherwise we have a problem on DMAPI filesystems
+ * such as XFS DMAPI.
+ */
+ ndelay_off(opened_file);
+
+ /* Set the download offset (from REST) if any */
+ if (offset != 0)
+ xlseek(opened_file, offset, SEEK_SET);
+
+ response = xasprintf(
+ "Opening BINARY mode data connection for (%s %"OFF_FMT"u bytes).",
+ G.ftp_arg, statbuf.st_size);
+
+ remote_fd = get_remote_transfer_fd(response);
+ free(response);
+ if (remote_fd < 0)
+ goto port_pasv_cleanup_out;
+
+ trans_ret = bb_copyfd_eof(opened_file, remote_fd);
+ ftpdataio_dispose_transfer_fd();
+ if (trans_ret < 0)
+ cmdio_write(FTP_BADSENDFILE, "Error sending local file");
+ else
+ cmdio_write(FTP_TRANSFEROK, "File sent OK");
+
+port_pasv_cleanup_out:
+ port_cleanup();
+ pasv_cleanup();
+file_close_out:
+ close(opened_file);
+}
+
+static void
+handle_dir_common(int full_details, int stat_cmd)
+{
+ int fd;
+ struct stat statbuf;
+
+ if (!stat_cmd && !data_transfer_checks_ok())
+ return;
+
+ if (stat_cmd) {
+ fd = STDIN_FILENO;
+ cmdio_write_hyphen(FTP_STATFILE_OK, "Status follows:");
+ } else {
+ fd = get_remote_transfer_fd("Here comes the directory listing");
+ if (fd < 0)
+ goto bail;
+ }
+
+ if (G.ftp_arg != NULL) {
+ if (lstat(G.ftp_arg, &statbuf) != 0) {
+ /* Dir doesn't exist => return ok to client */
+ goto bail;
+ }
+ if (S_ISREG(statbuf.st_mode) || S_ISLNK(statbuf.st_mode))
+ write_filestats(fd, G.ftp_arg, &statbuf);
+ else if (S_ISDIR(statbuf.st_mode))
+ write_dirstats(fd, G.ftp_arg, full_details);
+ } else
+ write_dirstats(fd, ".", full_details);
+
+bail:
+ /* Well, if we can't open directory/file it doesn't matter */
+ if (!stat_cmd) {
+ ftpdataio_dispose_transfer_fd();
+ pasv_cleanup();
+ port_cleanup();
+ cmdio_write(FTP_TRANSFEROK, "OK");
+ } else
+ cmdio_write(FTP_STATFILE_OK, "End of status");
+}
+
+static void
+handle_list(void)
+{
+ handle_dir_common(1, 0);
+}
+
+static void
+handle_type(void)
+{
+ if (G.ftp_arg
+ && ( ((G.ftp_arg[0] | 0x20) == 'i' && G.ftp_arg[1] == '\0')
+ || !strcasecmp(G.ftp_arg, "L8")
+ || !strcasecmp(G.ftp_arg, "L 8")
+ )
+ ) {
+ cmdio_write(FTP_TYPEOK, "Switching to Binary mode");
+ } else {
+ cmdio_write(FTP_BADCMD, "Unrecognised TYPE command");
+ }
+}
+
+static void
+handle_port(void)
+{
+ unsigned short port;
+ char *raw = NULL, *port_part;
+ len_and_sockaddr *lsa = NULL;
+
+ pasv_cleanup();
+ port_cleanup();
+
+ if (G.ftp_arg == NULL)
+ goto bail;
+
+ raw = replace_text(G.ftp_arg, ',', ".");
+
+ port_part = strrchr(raw, '.');
+ if (port_part == NULL)
+ goto bail;
+
+ port = xatou16(&port_part[1]);
+ *port_part = '\0';
+
+ port_part = strrchr(raw, '.');
+ if (port_part == NULL)
+ goto bail;
+
+ port |= xatou16(&port_part[1]) << 8;
+ *port_part = '\0';
+
+ lsa = xdotted2sockaddr(raw, port);
+
+bail:
+ free(raw);
+
+ if (lsa == NULL) {
+ cmdio_write(FTP_BADCMD, "Illegal PORT command");
+ return;
+ }
+
+ G.port_addr = lsa;
+ cmdio_write(FTP_PORTOK, "PORT command successful. Consider using PASV");
+}
+
+#if ENABLE_FEATURE_FTP_WRITE
+static void
+handle_upload_common(int is_append, int is_unique)
+{
+ char *template = NULL;
+ int trans_ret;
+ int new_file_fd;
+ int remote_fd;
+
+ enum {
+ fileflags = O_CREAT | O_WRONLY | O_APPEND,
+ };
+
+ off_t offset = G.restart_pos;
+
+ G.restart_pos = 0;
+ if (!data_transfer_checks_ok())
+ return;
+
+ if (is_unique) {
+ template = xstrdup("uniq.XXXXXX");
+ /*
+ * XXX Use mkostemp here? vsftpd opens file with O_CREAT, O_WRONLY,
+ * O_APPEND and O_EXCL flags...
+ */
+ new_file_fd = mkstemp(template);
+ } else {
+ /* XXX Do we need check if ftp_arg != NULL? */
+ if (!is_append && offset == 0)
+ new_file_fd = open(G.ftp_arg, O_CREAT | O_WRONLY | O_APPEND | O_NONBLOCK | O_TRUNC, 0666);
+ else
+ new_file_fd = open(G.ftp_arg, O_CREAT | O_WRONLY | O_APPEND | O_NONBLOCK, 0666);
+ }
+
+ if (new_file_fd < 0) {
+ cmdio_write(FTP_UPLOADFAIL, "Can't create file");
+ return;
+ }
+
+ if (!is_append && offset != 0) {
+ /* warning, allows seek past end of file! Check for seek > size? */
+ xlseek(new_file_fd, offset, SEEK_SET);
+ }
+
+ if (is_unique) {
+ char *resp = xasprintf("FILE: %s", template);
+ remote_fd = get_remote_transfer_fd(resp);
+ free(resp);
+ free(template);
+ } else
+ remote_fd = get_remote_transfer_fd("Ok to send data");
+
+ if (remote_fd < 0)
+ goto bail;
+
+ trans_ret = bb_copyfd_eof(remote_fd, new_file_fd);
+ ftpdataio_dispose_transfer_fd();
+
+ if (trans_ret < 0)
+ cmdio_write(FTP_BADSENDFILE, "Failure writing to local file");
+ else
+ cmdio_write(FTP_TRANSFEROK, "File receive OK");
+
+bail:
+ port_cleanup();
+ pasv_cleanup();
+ close(new_file_fd);
+}
+
+static void
+handle_stor(void)
+{
+ handle_upload_common(0, 0);
+}
+
+static void
+handle_mkd(void)
+{
+ int retval;
+
+ /* Do we need check if ftp_arg != NULL? */
+ retval = mkdir(G.ftp_arg, 0770);
+ if (retval != 0) {
+ cmdio_write(FTP_FILEFAIL, "Create directory operation failed");
+ return;
+ }
+
+ cmdio_write(FTP_MKDIROK, "created");
+}
+
+static void
+handle_rmd(void)
+{
+ int retval;
+
+ /* Do we need check if ftp_arg != NULL? */
+ retval = rmdir(G.ftp_arg);
+ if (retval != 0)
+ cmdio_write(FTP_FILEFAIL, "rmdir failed");
+ else
+ cmdio_write(FTP_RMDIROK, "rmdir successful");
+}
+
+static void
+handle_dele(void)
+{
+ int retval;
+
+ /* Do we need check if ftp_arg != NULL? */
+ retval = unlink(G.ftp_arg);
+ if (retval != 0)
+ cmdio_write(FTP_FILEFAIL, "Delete failed");
+ else
+ cmdio_write(FTP_DELEOK, "Delete successful");
+}
+#endif /* ENABLE_FEATURE_FTP_WRITE */
+
+static void
+handle_rest(void)
+{
+ /* When ftp_arg == NULL simply restart from beginning */
+ G.restart_pos = xatoi_u(G.ftp_arg);
+ cmdio_write(FTP_RESTOK, "Restart OK");
+}
+
+#if ENABLE_FEATURE_FTP_WRITE
+static void
+handle_rnfr(void)
+{
+ struct stat statbuf;
+ int retval;
+
+ /* Clear old value */
+ free(G.rnfr_filename);
+
+ /* Does it exist? Do we need check if ftp_arg != NULL? */
+ retval = stat(G.ftp_arg, &statbuf);
+ if (retval == 0) {
+ /* Yes */
+ G.rnfr_filename = xstrdup(G.ftp_arg);
+ cmdio_write(FTP_RNFROK, "Ready for RNTO");
+ } else
+ cmdio_write(FTP_FILEFAIL, "RNFR command failed");
+}
+
+static void
+handle_rnto(void)
+{
+ int retval;
+
+ /* If we didn't get a RNFR, throw a wobbly */
+ if (G.rnfr_filename == NULL) {
+ cmdio_write(FTP_NEEDRNFR, "RNFR required first");
+ return;
+ }
+
+ /* XXX Do we need check if ftp_arg != NULL? */
+ retval = rename(G.rnfr_filename, G.ftp_arg);
+
+ free(G.rnfr_filename);
+
+ if (retval == 0)
+ cmdio_write(FTP_RENAMEOK, "Rename successful");
+ else
+ cmdio_write(FTP_FILEFAIL, "Rename failed");
+}
+#endif /* ENABLE_FEATURE_FTP_WRITE */
+
+static void
+handle_nlst(void)
+{
+ handle_dir_common(0, 0);
+}
+
+#if ENABLE_FEATURE_FTP_WRITE
+static void
+handle_appe(void)
+{
+ handle_upload_common(1, 0);
+}
+#endif
+
+static void
+handle_help(void)
+{
+ cmdio_write_hyphen(FTP_HELP, "Recognized commands:");
+ cmdio_write_raw(" ALLO CDUP CWD HELP LIST\r\n"
+ " MODE NLST NOOP PASS PASV PORT PWD QUIT\r\n"
+ " REST RETR STAT STRU SYST TYPE USER\r\n"
+#if ENABLE_FEATURE_FTP_WRITE
+ " APPE DELE MKD RMD RNFR RNTO STOR STOU\r\n"
+#endif
+ );
+ cmdio_write(FTP_HELP, "Help OK");
+}
+
+#if ENABLE_FEATURE_FTP_WRITE
+static void
+handle_stou(void)
+{
+ handle_upload_common(0, 1);
+}
+#endif
+
+static void
+handle_stat(void)
+{
+ cmdio_write_hyphen(FTP_STATOK, "FTP server status:");
+ cmdio_write_raw(" TYPE: BINARY\r\n");
+ cmdio_write(FTP_STATOK, "End of status");
+}
+
+static void
+handle_stat_file(void)
+{
+ handle_dir_common(1, 1);
+}
+
+/* TODO: libbb candidate (tftp has another copy) */
+static len_and_sockaddr *get_sock_lsa(int s)
+{
+ len_and_sockaddr *lsa;
+ socklen_t len = 0;
+
+ if (getsockname(s, NULL, &len) != 0)
+ return NULL;
+ lsa = xzalloc(LSA_LEN_SIZE + len);
+ lsa->len = len;
+ getsockname(s, &lsa->u.sa, &lsa->len);
+ return lsa;
+}
+
+int ftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ftpd_main(int argc UNUSED_PARAM, char **argv)
+{
+ smallint user_was_specified = 0;
+
+ INIT_G();
+
+ G.local_addr = get_sock_lsa(STDIN_FILENO);
+ if (!G.local_addr) {
+ /* This is confusing:
+ * bb_error_msg_and_die("stdin is not a socket");
+ * Better: */
+ bb_show_usage();
+ /* Help text says that ftpd must be used as inetd service,
+ * which is by far the most usual cause of get_sock_lsa
+ * failure */
+ }
+
+ logmode = LOGMODE_SYSLOG;
+
+ USE_FEATURE_FTP_WRITE(G.write_enable =) getopt32(argv, "" USE_FEATURE_FTP_WRITE("w"));
+ if (argv[optind]) {
+ xchdir(argv[optind]);
+ chroot(".");
+ }
+
+// if (G.local_addr->u.sa.sa_family != AF_INET)
+// bb_error_msg_and_die("Only IPv4 is supported");
+
+ /* Signals. We'll always take -EPIPE rather than a rude signal, thanks */
+ signal(SIGPIPE, SIG_IGN);
+
+ /* Set up options on the command socket */
+ setsockopt(STDIN_FILENO, IPPROTO_TCP, TCP_NODELAY, &const_int_1, sizeof(const_int_1));
+ setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+ setsockopt(STDIN_FILENO, SOL_SOCKET, SO_OOBINLINE, &const_int_1, sizeof(const_int_1));
+
+ cmdio_write(FTP_GREET, "Welcome");
+
+ while (1) {
+ uint32_t cmdval = cmdio_get_cmd_and_arg();
+
+ if (cmdval == const_USER) {
+ if (G.ftp_arg == NULL || strcasecmp(G.ftp_arg, "anonymous") != 0)
+ cmdio_write(FTP_LOGINERR, "Server is anonymous only");
+ else {
+ user_was_specified = 1;
+ cmdio_write(FTP_GIVEPWORD, "Please specify the password");
+ }
+ } else if (cmdval == const_PASS) {
+ if (user_was_specified)
+ break;
+ cmdio_write(FTP_NEEDUSER, "Login with USER");
+ } else if (cmdval == const_QUIT) {
+ cmdio_write(FTP_GOODBYE, "Goodbye");
+ return 0;
+ } else {
+ cmdio_write(FTP_LOGINERR,
+ "Login with USER and PASS");
+ }
+ }
+
+ umask(077);
+ cmdio_write(FTP_LOGINOK, "Login successful");
+
+ while (1) {
+ uint32_t cmdval = cmdio_get_cmd_and_arg();
+
+ if (cmdval == const_QUIT) {
+ cmdio_write(FTP_GOODBYE, "Goodbye");
+ return 0;
+ }
+ if (cmdval == const_PWD)
+ handle_pwd();
+ else if (cmdval == const_CWD)
+ handle_cwd();
+ else if (cmdval == const_CDUP)
+ handle_cdup();
+ else if (cmdval == const_PASV)
+ handle_pasv();
+ else if (cmdval == const_RETR)
+ handle_retr();
+ else if (cmdval == const_NOOP)
+ cmdio_write(FTP_NOOPOK, "NOOP ok");
+ else if (cmdval == const_SYST)
+ cmdio_write(FTP_SYSTOK, "UNIX Type: L8");
+ else if (cmdval == const_HELP)
+ handle_help();
+ else if (cmdval == const_LIST)
+ handle_list();
+ else if (cmdval == const_TYPE)
+ handle_type();
+ else if (cmdval == const_PORT)
+ handle_port();
+ else if (cmdval == const_REST)
+ handle_rest();
+ else if (cmdval == const_NLST)
+ handle_nlst();
+#if ENABLE_FEATURE_FTP_WRITE
+ else if (G.write_enable) {
+ if (cmdval == const_STOR)
+ handle_stor();
+ else if (cmdval == const_MKD)
+ handle_mkd();
+ else if (cmdval == const_RMD)
+ handle_rmd();
+ else if (cmdval == const_DELE)
+ handle_dele();
+ else if (cmdval == const_RNFR)
+ handle_rnfr();
+ else if (cmdval == const_RNTO)
+ handle_rnto();
+ else if (cmdval == const_APPE)
+ handle_appe();
+ else if (cmdval == const_STOU)
+ handle_stou();
+ }
+#endif
+ else if (cmdval == const_STRU) {
+ if (G.ftp_arg
+ && (G.ftp_arg[0] | 0x20) == 'f'
+ && G.ftp_arg[1] == '\0'
+ ) {
+ cmdio_write(FTP_STRUOK, "Structure set to F");
+ } else
+ cmdio_write(FTP_BADSTRU, "Bad STRU command");
+
+ } else if (cmdval == const_MODE) {
+ if (G.ftp_arg
+ && (G.ftp_arg[0] | 0x20) == 's'
+ && G.ftp_arg[1] == '\0'
+ ) {
+ cmdio_write(FTP_MODEOK, "Mode set to S");
+ } else
+ cmdio_write(FTP_BADMODE, "Bad MODE command");
+ }
+ else if (cmdval == const_ALLO)
+ cmdio_write(FTP_ALLOOK, "ALLO command ignored");
+ else if (cmdval == const_STAT) {
+ if (G.ftp_arg == NULL)
+ handle_stat();
+ else
+ handle_stat_file();
+ } else if (cmdval == const_USER)
+ cmdio_write(FTP_LOGINERR, "Can't change to another user");
+ else if (cmdval == const_PASS)
+ cmdio_write(FTP_LOGINOK, "Already logged in");
+ else if (cmdval == const_STOR
+ || cmdval == const_MKD
+ || cmdval == const_RMD
+ || cmdval == const_DELE
+ || cmdval == const_RNFR
+ || cmdval == const_RNTO
+ || cmdval == const_APPE
+ || cmdval == const_STOU
+ ) {
+ cmdio_write(FTP_NOPERM, "Permission denied");
+ } else {
+ cmdio_write(FTP_BADCMD, "Unknown command");
+ }
+ }
+}
projects / oweals / busybox.git / commitdiff