mirror of https://github.com/sheumann/hush.git
ftpd: reuse ls applet for LIST/NLST/STAT generation
function old new delta popen_ls - 211 +211 ftpd_main 1760 1826 +66 handle_dir_common 199 228 +29 get_remote_transfer_fd 89 104 +15 replace_char 30 34 +4 handle_upload_common 263 265 +2 bind_for_passive_mode 129 121 -8 cmdio_write 84 62 -22 escape_text 166 136 -30 init_data_sock_params 81 - -81 ftpdataio_dispose_transfer_fd 87 - -87 write_dirstats 149 - -149 write_filestats 603 - -603 ------------------------------------------------------------------------------ (add/remove: 1/4 grow/shrink: 11/5 up/down: 384/-986) Total: -602 bytes text data bss dec hex filename 808804 476 7864 817144 c77f8 busybox_old 808156 476 7864 816496 c7570 busybox_unstripped
This commit is contained in:
Denis Vlasenko
parent
9b2fbda538
commit
c41cba5a57
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@ -44,6 +44,7 @@ lib-$(CONFIG_LENGTH) += length.o
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lib-$(CONFIG_LN) += ln.o
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lib-$(CONFIG_LOGNAME) += logname.o
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lib-$(CONFIG_LS) += ls.o
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lib-$(CONFIG_FTPD) += ls.o
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lib-$(CONFIG_MD5SUM) += md5_sha1_sum.o
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lib-$(CONFIG_MKDIR) += mkdir.o
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lib-$(CONFIG_MKFIFO) += mkfifo.o
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@ -864,7 +864,6 @@ static const char ls_color_opt[] ALIGN1 =
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#endif
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int ls_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ls_main(int argc UNUSED_PARAM, char **argv)
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{
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struct dnode **dnd;
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@ -917,6 +917,8 @@ int test_main(int argc, char **argv) USE_TEST(MAIN_EXTERNALLY_VISIBLE);
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int kill_main(int argc, char **argv) USE_KILL(MAIN_EXTERNALLY_VISIBLE);
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/* Similar, but used by chgrp, not shell */
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int chown_main(int argc, char **argv) USE_CHOWN(MAIN_EXTERNALLY_VISIBLE);
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/* Used by ftpd */
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int ls_main(int argc, char **argv) USE_LS(MAIN_EXTERNALLY_VISIBLE);
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/* Don't need USE_xxx() guard for these */
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int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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@ -63,9 +63,24 @@
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#define STR1(s) #s
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#define STR(s) STR1(s)
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/* Convert a constant to 3-digit string, packed into uint32_t */
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enum {
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OPT_v = (1 << 0),
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OPT_w = (1 << 1),
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/* Shift for Nth decimal digit */
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SHIFT0 = 16 * BB_LITTLE_ENDIAN + 8 * BB_BIG_ENDIAN,
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SHIFT1 = 8 * BB_LITTLE_ENDIAN + 16 * BB_BIG_ENDIAN,
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SHIFT2 = 0 * BB_LITTLE_ENDIAN + 24 * BB_BIG_ENDIAN,
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};
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#define STRNUM32(s) (uint32_t)(0 \
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| (('0' + ((s) / 1 % 10)) << SHIFT0) \
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| (('0' + ((s) / 10 % 10)) << SHIFT1) \
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| (('0' + ((s) / 100 % 10)) << SHIFT2) \
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)
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enum {
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OPT_l = (1 << 0),
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OPT_1 = (1 << 1),
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OPT_v = (1 << 2),
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OPT_w = (1 << 3),
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#define mk_const4(a,b,c,d) (((a * 0x100 + b) * 0x100 + c) * 0x100 + d)
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#define mk_const3(a,b,c) ((a * 0x100 + b) * 0x100 + c)
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@ -106,78 +121,84 @@ struct globals {
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len_and_sockaddr *local_addr;
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len_and_sockaddr *port_addr;
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int pasv_listen_fd;
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int data_fd;
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int proc_self_fd;
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off_t restart_pos;
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char *ftp_cmd;
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char *ftp_arg;
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#if ENABLE_FEATURE_FTP_WRITE
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char *rnfr_filename;
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#endif
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smallint opts;
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { } while (0)
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static char *
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escape_text(const char *prepend, const char *str, char from, const char *to, char append)
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escape_text(const char *prepend, const char *str, unsigned escapee)
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{
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size_t retlen, remainlen, chunklen, tolen;
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const char *remain;
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unsigned retlen, remainlen, chunklen;
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char *ret, *found;
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char append;
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append = (char)escapee;
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escapee >>= 8;
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remain = str;
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remainlen = strlen(str);
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tolen = strlen(to);
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/* Simply alloc strlen(str)*strlen(to). "to" is max 2 so it's ok */
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retlen = strlen(prepend);
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ret = xmalloc(retlen + remainlen * tolen + 1 + 1);
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ret = xmalloc(retlen + remainlen * 2 + 1 + 1);
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strcpy(ret, prepend);
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for (;;) {
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found = strchrnul(remain, from);
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chunklen = found - remain;
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found = strchrnul(str, escapee);
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chunklen = found - str + 1;
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/* Copy chunk which doesn't contain 'from' to ret */
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memcpy(&ret[retlen], remain, chunklen);
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/* Copy chunk up to and including escapee (or NUL) to ret */
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memcpy(ret + retlen, str, chunklen);
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retlen += chunklen;
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if (*found != '\0') {
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/* Now copy 'to' instead of 'from' */
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memcpy(&ret[retlen], to, tolen);
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retlen += tolen;
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remain = found + 1;
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} else {
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ret[retlen] = append;
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ret[retlen+1] = '\0';
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if (*found == '\0') {
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/* It wasn't escapee, it was NUL! */
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ret[retlen - 1] = append; /* replace NUL */
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ret[retlen] = '\0'; /* add NUL */
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break;
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}
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ret[retlen++] = escapee; /* duplicate escapee */
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str = found + 1;
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}
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return ret;
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}
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static void
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/* Returns strlen as a bonus */
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static unsigned
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replace_char(char *str, char from, char to)
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{
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while ((str = strchr(str, from)) != NULL)
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*str++ = to;
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char *p = str;
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while (*p) {
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if (*p == from)
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*p = to;
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p++;
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}
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return p - str;
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}
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static void
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cmdio_write(unsigned status, const char *str)
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cmdio_write(uint32_t status_str, const char *str)
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{
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union {
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char buf[4];
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uint32_t v32;
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} u;
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char *response;
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int len;
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u.v32 = status_str;
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/* FTP allegedly uses telnet protocol for command link.
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* In telnet, 0xff is an escape char, and needs to be escaped: */
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response = escape_text(utoa(status), str, '\xff', "\xff\xff", '\r');
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response = escape_text(u.buf, str, (0xff << 8) + '\r');
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/* ?! does FTP send embedded LFs as NULs? wow */
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len = strlen(response);
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replace_char(response, '\n', '\0');
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len = replace_char(response, '\n', '\0');
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response[len++] = '\n'; /* tack on trailing '\n' */
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xwrite(STDOUT_FILENO, response, len);
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@ -215,9 +236,9 @@ handle_pwd(void)
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cwd = xstrdup("");
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/* We have to promote each " to "" */
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response = escape_text(" \"", cwd, '\"', "\"\"", '\"');
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response = escape_text(" \"", cwd, ('"' << 8) + '"');
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free(cwd);
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cmdio_write(FTP_PWDOK, response);
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cmdio_write(STRNUM32(FTP_PWDOK), response);
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free(response);
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}
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@ -261,21 +282,6 @@ handle_help(void)
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/* Download commands */
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static void
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init_data_sock_params(int sock_fd)
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{
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struct linger linger;
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G.data_fd = sock_fd;
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memset(&linger, 0, sizeof(linger));
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linger.l_onoff = 1;
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linger.l_linger = 32767;
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setsockopt(sock_fd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
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setsockopt(sock_fd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
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}
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static int
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ftpdataio_get_pasv_fd(void)
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{
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@ -288,39 +294,10 @@ ftpdataio_get_pasv_fd(void)
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return remote_fd;
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}
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init_data_sock_params(remote_fd);
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setsockopt(remote_fd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
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return remote_fd;
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}
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static int
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ftpdataio_get_port_fd(void)
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{
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int remote_fd;
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/* Do we want to die or print error to client? */
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remote_fd = xconnect_stream(G.port_addr);
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init_data_sock_params(remote_fd);
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return remote_fd;
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}
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static void
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ftpdataio_dispose_transfer_fd(void)
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{
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/* This close() blocks because we set SO_LINGER */
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if (G.data_fd > STDOUT_FILENO) {
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if (close(G.data_fd) < 0) {
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/* Do it again without blocking. */
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struct linger linger;
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memset(&linger, 0, sizeof(linger));
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setsockopt(G.data_fd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
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close(G.data_fd);
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}
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}
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G.data_fd = -1;
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}
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static inline int
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port_active(void)
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{
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@ -341,12 +318,12 @@ get_remote_transfer_fd(const char *p_status_msg)
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if (pasv_active())
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remote_fd = ftpdataio_get_pasv_fd();
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else
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remote_fd = ftpdataio_get_port_fd();
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remote_fd = xconnect_stream(G.port_addr);
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if (remote_fd < 0)
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return remote_fd;
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cmdio_write(FTP_DATACONN, p_status_msg);
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cmdio_write(STRNUM32(FTP_DATACONN), p_status_msg);
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return remote_fd;
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}
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@ -374,21 +351,21 @@ port_pasv_cleanup(void)
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static unsigned
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bind_for_passive_mode(void)
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{
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int fd;
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unsigned port;
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port_pasv_cleanup();
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G.pasv_listen_fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
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setsockopt_reuseaddr(G.pasv_listen_fd);
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G.pasv_listen_fd = fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
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setsockopt_reuseaddr(fd);
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set_nport(G.local_addr, 0);
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xbind(G.pasv_listen_fd, &G.local_addr->u.sa, G.local_addr->len);
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xlisten(G.pasv_listen_fd, 1);
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getsockname(G.pasv_listen_fd, &G.local_addr->u.sa, &G.local_addr->len);
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xbind(fd, &G.local_addr->u.sa, G.local_addr->len);
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xlisten(fd, 1);
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getsockname(fd, &G.local_addr->u.sa, &G.local_addr->len);
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port = get_nport(&G.local_addr->u.sa);
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port = ntohs(port);
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return port;
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}
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@ -487,7 +464,7 @@ handle_retr(void)
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G.restart_pos = 0;
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if (!data_transfer_checks_ok())
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return;
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return; /* data_transfer_checks_ok emitted error response */
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/* O_NONBLOCK is useful if file happens to be a device node */
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opened_file = G.ftp_arg ? open(G.ftp_arg, O_RDONLY | O_NONBLOCK) : -1;
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@ -520,7 +497,7 @@ handle_retr(void)
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goto port_pasv_cleanup_out;
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trans_ret = bb_copyfd_eof(opened_file, remote_fd);
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ftpdataio_dispose_transfer_fd();
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close(remote_fd);
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if (trans_ret < 0)
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cmdio_write_error(FTP_BADSENDFILE);
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else
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@ -535,185 +512,105 @@ handle_retr(void)
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/* List commands */
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static char *
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statbuf_getperms(const struct stat *statbuf)
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static int
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popen_ls(const char *opt)
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{
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char *perms;
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enum { r = 'r', w = 'w', x = 'x', s = 's', S = 'S' };
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char *cwd;
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const char *argv[5] = { "ftpd", opt, NULL, G.ftp_arg, NULL };
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struct fd_pair outfd;
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pid_t pid;
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perms = xmalloc(11);
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memset(perms, '-', 10);
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cwd = xrealloc_getcwd_or_warn(NULL);
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perms[0] = '?';
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switch (statbuf->st_mode & S_IFMT) {
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case S_IFREG: perms[0] = '-'; break;
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case S_IFDIR: perms[0] = 'd'; break;
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case S_IFLNK: perms[0] = 'l'; break;
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case S_IFIFO: perms[0] = 'p'; break;
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case S_IFSOCK: perms[0] = s; break;
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case S_IFCHR: perms[0] = 'c'; break;
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case S_IFBLK: perms[0] = 'b'; break;
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}
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xpiped_pair(outfd);
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if (statbuf->st_mode & S_IRUSR) perms[1] = r;
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if (statbuf->st_mode & S_IWUSR) perms[2] = w;
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if (statbuf->st_mode & S_IXUSR) perms[3] = x;
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if (statbuf->st_mode & S_IRGRP) perms[4] = r;
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if (statbuf->st_mode & S_IWGRP) perms[5] = w;
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if (statbuf->st_mode & S_IXGRP) perms[6] = x;
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if (statbuf->st_mode & S_IROTH) perms[7] = r;
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if (statbuf->st_mode & S_IWOTH) perms[8] = w;
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if (statbuf->st_mode & S_IXOTH) perms[9] = x;
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if (statbuf->st_mode & S_ISUID) perms[3] = (perms[3] == x) ? s : S;
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if (statbuf->st_mode & S_ISGID) perms[6] = (perms[6] == x) ? s : S;
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if (statbuf->st_mode & S_ISVTX) perms[9] = (perms[9] == x) ? 't' : 'T';
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fflush(NULL);
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pid = vfork();
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perms[10] = '\0';
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return perms;
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}
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static void
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write_filestats(int fd, const char *filename,
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const struct stat *statbuf)
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{
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off_t size;
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char *stats, *lnkname = NULL, *perms;
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const char *name;
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char timestr[32];
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struct tm *tm;
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name = bb_get_last_path_component_nostrip(filename);
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if (statbuf != NULL) {
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size = statbuf->st_size;
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if (S_ISLNK(statbuf->st_mode))
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/* Damn symlink... */
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lnkname = xmalloc_readlink(filename);
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tm = gmtime(&statbuf->st_mtime);
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if (strftime(timestr, sizeof(timestr), "%b %d %H:%M", tm) == 0)
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bb_error_msg_and_die("strftime");
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timestr[sizeof(timestr) - 1] = '\0';
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perms = statbuf_getperms(statbuf);
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stats = xasprintf("%s %u\tftp ftp %"OFF_FMT"u\t%s %s",
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perms, (int) statbuf->st_nlink,
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size, timestr, name);
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free(perms);
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} else
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stats = xstrdup(name);
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xwrite_str(fd, stats);
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free(stats);
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if (lnkname != NULL) {
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xwrite_str(fd, " -> ");
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xwrite_str(fd, lnkname);
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free(lnkname);
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}
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xwrite_str(fd, "\r\n");
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}
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static void
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write_dirstats(int fd, const char *dname, int details)
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{
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DIR *dir;
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struct dirent *dirent;
|
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struct stat statbuf;
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char *filename;
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dir = xopendir(dname);
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for (;;) {
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dirent = readdir(dir);
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if (dirent == NULL)
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break;
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/* Ignore . and .. */
|
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if (dirent->d_name[0] == '.') {
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if (dirent->d_name[1] == '\0'
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|| (dirent->d_name[1] == '.' && dirent->d_name[2] == '\0')
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) {
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continue;
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}
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switch (pid) {
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case -1: /* failure */
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bb_perror_msg_and_die("vfork");
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case 0: /* child */
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/* NB: close _first_, then move fds! */
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close(outfd.rd);
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xmove_fd(outfd.wr, STDOUT_FILENO);
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close(STDIN_FILENO);
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||||
/* xopen("/dev/null", O_RDONLY); - chroot may lack it! */
|
||||
if (fchdir(G.proc_self_fd) == 0) {
|
||||
close(G.proc_self_fd);
|
||||
argv[2] = cwd;
|
||||
/* ftpd ls helper chdirs to argv[2],
|
||||
* preventing peer from seeing /proc/self
|
||||
*/
|
||||
execv("exe", (char**) argv);
|
||||
}
|
||||
|
||||
if (details) {
|
||||
filename = xasprintf("%s/%s", dname, dirent->d_name);
|
||||
if (lstat(filename, &statbuf) != 0) {
|
||||
free(filename);
|
||||
break;
|
||||
}
|
||||
} else
|
||||
filename = xstrdup(dirent->d_name);
|
||||
|
||||
write_filestats(fd, filename, details ? &statbuf : NULL);
|
||||
free(filename);
|
||||
_exit(127);
|
||||
}
|
||||
|
||||
closedir(dir);
|
||||
/* parent */
|
||||
close(outfd.wr);
|
||||
free(cwd);
|
||||
return outfd.rd;
|
||||
}
|
||||
|
||||
static void
|
||||
handle_dir_common(int full_details, int stat_cmd)
|
||||
handle_dir_common(int opts)
|
||||
{
|
||||
int fd;
|
||||
struct stat statbuf;
|
||||
FILE *ls_fp;
|
||||
char *line;
|
||||
int ls_fd;
|
||||
|
||||
if (!stat_cmd && !data_transfer_checks_ok())
|
||||
return;
|
||||
if (!(opts & 1) && !data_transfer_checks_ok())
|
||||
return; /* data_transfer_checks_ok emitted error response */
|
||||
|
||||
if (stat_cmd) {
|
||||
fd = STDIN_FILENO;
|
||||
ls_fd = popen_ls((opts & 2) ? "-l" : "-1");
|
||||
ls_fp = fdopen(ls_fd, "r");
|
||||
if (!ls_fp) /* never happens. paranoia */
|
||||
bb_perror_msg_and_die("fdopen");
|
||||
|
||||
if (opts & 1) {
|
||||
/* STAT <filename> */
|
||||
cmdio_write_raw(STR(FTP_STATFILE_OK)"-Status follows:\r\n");
|
||||
} else {
|
||||
fd = get_remote_transfer_fd(" Here comes the directory listing");
|
||||
if (fd < 0)
|
||||
goto bail;
|
||||
}
|
||||
|
||||
if (G.ftp_arg) {
|
||||
if (lstat(G.ftp_arg, &statbuf) != 0) {
|
||||
/* Dir doesn't exist => return ok to client */
|
||||
goto bail;
|
||||
while (1) {
|
||||
line = xmalloc_fgetline(ls_fp);
|
||||
if (!line)
|
||||
break;
|
||||
cmdio_write(0, line); /* hack: 0 results in no status at all */
|
||||
free(line);
|
||||
}
|
||||
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();
|
||||
cmdio_write_ok(FTP_STATFILE_OK);
|
||||
} else {
|
||||
/* LIST/NLST [<filename>] */
|
||||
int remote_fd = get_remote_transfer_fd(" Here comes the directory listing");
|
||||
if (remote_fd >= 0) {
|
||||
while (1) {
|
||||
line = xmalloc_fgetline(ls_fp);
|
||||
if (!line)
|
||||
break;
|
||||
xwrite_str(remote_fd, line);
|
||||
xwrite(remote_fd, "\r\n", 2);
|
||||
free(line);
|
||||
}
|
||||
}
|
||||
close(remote_fd);
|
||||
port_pasv_cleanup();
|
||||
cmdio_write_ok(FTP_TRANSFEROK);
|
||||
} else
|
||||
cmdio_write_ok(FTP_STATFILE_OK);
|
||||
}
|
||||
fclose(ls_fp); /* closes ls_fd too */
|
||||
}
|
||||
|
||||
static void
|
||||
handle_list(void)
|
||||
{
|
||||
handle_dir_common(1, 0);
|
||||
handle_dir_common(2);
|
||||
}
|
||||
|
||||
static void
|
||||
handle_nlst(void)
|
||||
{
|
||||
handle_dir_common(0, 0);
|
||||
handle_dir_common(0);
|
||||
}
|
||||
|
||||
static void
|
||||
handle_stat_file(void)
|
||||
{
|
||||
handle_dir_common(1, 1);
|
||||
handle_dir_common(3);
|
||||
}
|
||||
|
||||
static void
|
||||
|
|
@ -840,7 +737,7 @@ handle_upload_common(int is_append, int is_unique)
|
|||
goto bail;
|
||||
|
||||
trans_ret = bb_copyfd_eof(remote_fd, local_file_fd);
|
||||
ftpdataio_dispose_transfer_fd();
|
||||
close(remote_fd);
|
||||
|
||||
if (trans_ret < 0)
|
||||
cmdio_write_error(FTP_BADSENDFILE);
|
||||
|
|
@ -905,8 +802,19 @@ cmdio_get_cmd_and_arg(void)
|
|||
}
|
||||
|
||||
int ftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||||
int ftpd_main(int argc UNUSED_PARAM, char **argv)
|
||||
int ftpd_main(int argc, char **argv)
|
||||
{
|
||||
smallint opts;
|
||||
|
||||
opts = getopt32(argv, "l1v" USE_FEATURE_FTP_WRITE("w"));
|
||||
|
||||
if (opts & (OPT_l|OPT_1)) {
|
||||
/* Our secret backdoor to ls */
|
||||
xchdir(argv[2]);
|
||||
argv[2] = (char*)"--";
|
||||
return ls_main(argc, argv);
|
||||
}
|
||||
|
||||
INIT_G();
|
||||
|
||||
G.local_addr = get_sock_lsa(STDIN_FILENO);
|
||||
|
|
@ -920,13 +828,13 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
|
|||
* failure */
|
||||
}
|
||||
|
||||
G.opts = getopt32(argv, "v" USE_FEATURE_FTP_WRITE("w"));
|
||||
|
||||
openlog(applet_name, LOG_PID, LOG_DAEMON);
|
||||
logmode |= LOGMODE_SYSLOG;
|
||||
if (!(G.opts & OPT_v))
|
||||
if (!(opts & OPT_v))
|
||||
logmode = LOGMODE_SYSLOG;
|
||||
|
||||
G.proc_self_fd = xopen("/proc/self", O_RDONLY | O_DIRECTORY);
|
||||
|
||||
if (argv[optind]) {
|
||||
xchdir(argv[optind]);
|
||||
chroot(".");
|
||||
|
|
@ -1064,7 +972,7 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
|
|||
else if (cmdval == const_REST)
|
||||
handle_rest();
|
||||
#if ENABLE_FEATURE_FTP_WRITE
|
||||
else if (G.opts & OPT_w) {
|
||||
else if (opts & OPT_w) {
|
||||
if (cmdval == const_STOR)
|
||||
handle_stor();
|
||||
else if (cmdval == const_MKD)
|
||||
|
|
|
|||
Loading…
Reference in New Issue