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wget: make it possible to have both SSL helpers configured
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
4271698fea
commit
2007ef5c3c
@ -51,10 +51,10 @@
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//config: FEATURE_WGET_LONG_OPTIONS is also enabled, the --timeout option
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//config: will work in addition to -T.
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//config:
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//config:choice
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//config: prompt "Choose how to handle https:// URLs"
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//config:config FEATURE_WGET_OPENSSL
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//config: bool "Try to connect to HTTPS using openssl"
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//config: default y
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//config: depends on WGET
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//config: default FEATURE_WGET_OPENSSL
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//config: help
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//config: Choose how wget establishes SSL connection for https:// URLs.
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//config:
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@ -74,19 +74,24 @@
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//config: openssl is also a big binary, often dynamically linked
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//config: against ~15 libraries.
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//config:
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//config:config FEATURE_WGET_SSL_HELPER
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//config: bool "Try to connect to HTTPS using ssl_helper"
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//config: default y
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//config: depends on WGET
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//config: help
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//config: Choose how wget establishes SSL connection for https:// URLs.
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//config:
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//config: Busybox itself contains no SSL code. wget will spawn
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//config: a helper program to talk over HTTPS.
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//config:
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//config: ssl_helper is a tool which can be built statically
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//config: from busybox sources against a small embedded SSL library.
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//config: Please see networking/ssl_helper/README.
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//config: It does not require double host resolution and emits
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//config: error messages to stderr.
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//config:
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//config:config FEATURE_WGET_OPENSSL
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//config: bool "openssl"
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//config:
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//config:config FEATURE_WGET_SSL_HELPER
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//config: bool "ssl_helper"
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//config:
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//config:endchoice
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//config: Precompiled static binary may be available at
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//config: http://busybox.net/downloads/binaries/
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//applet:IF_WGET(APPLET(wget, BB_DIR_USR_BIN, BB_SUID_DROP))
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@ -604,11 +609,12 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
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}
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#if ENABLE_FEATURE_WGET_OPENSSL
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static int spawn_https_helper(const char *host, unsigned port)
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static int spawn_https_helper_openssl(const char *host, unsigned port)
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{
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char *allocated = NULL;
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int sp[2];
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int pid;
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IF_FEATURE_WGET_SSL_HELPER(volatile int child_failed = 0;)
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) != 0)
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/* Kernel can have AF_UNIX support disabled */
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@ -617,7 +623,8 @@ static int spawn_https_helper(const char *host, unsigned port)
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if (!strchr(host, ':'))
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host = allocated = xasprintf("%s:%u", host, port);
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pid = BB_MMU ? xfork() : xvfork();
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fflush_all();
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pid = xvfork();
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if (pid == 0) {
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/* Child */
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char *argv[6];
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@ -625,10 +632,6 @@ static int spawn_https_helper(const char *host, unsigned port)
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close(sp[0]);
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xmove_fd(sp[1], 0);
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xdup2(0, 1);
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/*
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* TODO: develop a tiny ssl/tls helper (using matrixssl?),
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* try to exec it here before falling back to big fat openssl.
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*/
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/*
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* openssl s_client -quiet -connect www.kernel.org:443 2>/dev/null
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* It prints some debug stuff on stderr, don't know how to suppress it.
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@ -644,20 +647,31 @@ static int spawn_https_helper(const char *host, unsigned port)
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argv[5] = NULL;
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BB_EXECVP(argv[0], argv);
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xmove_fd(3, 2);
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# if ENABLE_FEATURE_WGET_SSL_HELPER
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child_failed = 1;
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xfunc_die();
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# else
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bb_perror_msg_and_die("can't execute '%s'", argv[0]);
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# endif
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/* notreached */
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}
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/* Parent */
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free(allocated);
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close(sp[1]);
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# if ENABLE_FEATURE_WGET_SSL_HELPER
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if (child_failed) {
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close(sp[0]);
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return -1;
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}
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# endif
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return sp[0];
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}
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#endif
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/* See networking/ssl_helper/README how to build one */
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#if ENABLE_FEATURE_WGET_SSL_HELPER
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static void spawn_https_helper(int network_fd)
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static void spawn_https_helper_small(int network_fd)
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{
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int sp[2];
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int pid;
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@ -935,20 +949,36 @@ static void download_one_url(const char *url)
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/* Open socket to http(s) server */
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#if ENABLE_FEATURE_WGET_OPENSSL
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/* openssl (and maybe ssl_helper) support is configured */
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if (target.protocol == P_HTTPS) {
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/* openssl-based helper
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* Inconvenient API since we can't give it an open fd
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*/
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int fd = spawn_https_helper(server.host, server.port);
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int fd = spawn_https_helper_openssl(server.host, server.port);
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# if ENABLE_FEATURE_WGET_SSL_HELPER
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if (fd < 0) { /* no openssl? try ssl_helper */
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sfp = open_socket(lsa);
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spawn_https_helper_small(fileno(sfp));
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goto socket_opened;
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}
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# else
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/* We don't check for exec("openssl") failure in this case */
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# endif
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sfp = fdopen(fd, "r+");
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if (!sfp)
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bb_perror_msg_and_die(bb_msg_memory_exhausted);
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} else
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#endif
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sfp = open_socket(lsa);
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#if ENABLE_FEATURE_WGET_SSL_HELPER
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goto socket_opened;
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}
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sfp = open_socket(lsa);
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socket_opened:
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#elif ENABLE_FEATURE_WGET_SSL_HELPER
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/* Only ssl_helper support is configured */
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sfp = open_socket(lsa);
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if (target.protocol == P_HTTPS)
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spawn_https_helper(fileno(sfp));
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spawn_https_helper_small(fileno(sfp));
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#else
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/* ssl (https) support is not configured */
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sfp = open_socket(lsa);
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#endif
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/* Send HTTP request */
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if (use_proxy) {
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