uclient-fetch: fix potential memory leaks

Fixes following issue reported by clang-12 static analyzer:

 uclient-fetch.c:612:25: warning: Potential leak of memory pointed to by 'username' [unix.Malloc]
                                 memset(optarg, '*', strlen(optarg));
                                                     ^~~~~~~~~~~~~~
 uclient-fetch.c:618:25: warning: Potential leak of memory pointed to by 'password' [unix.Malloc]
                                 memset(optarg, '*', strlen(optarg));
                                                     ^~~~~~~~~~~~~~

Signed-off-by: Petr Štetiar <ynezz@true.cz>

uclient: fix initialized but never read variable

Fixes following issue reported by clang-12 static analyzer:

 uclient.c:290:22: warning: Value stored to 'url' during its initialization is never read [deadcode.DeadStores]
         struct uclient_url *url = cl->url;
                             ^~~   ~~~~~~~

Signed-off-by: Petr Štetiar <ynezz@true.cz>

uclient-fetch: fix statement may fallt hrough

Fixes following issue reported by clang-12 static analyzer:

 uclient-fetch.c:228:6: error: this statement may fall through [-Werror=implicit-fallthrough=]
    if (sscanf(blobmsg_get_string(tb[H_RANGE]),
       ^
 uclient-fetch.c:236:2: note: here
   case 204:
   ^~~~

Signed-off-by: Petr Štetiar <ynezz@true.cz>

uclient-http: fix freeing of stack allocated memory

Fixes following issue reported by clang-12 static analyzer:

 uclient-http.c:568:2: warning: Memory allocated by alloca() should not be deallocated [unix.Malloc]
         free(buf_orig);
         ^~~~~~~~~~~~~~

Signed-off-by: Petr Štetiar <ynezz@true.cz>

Fix extra compiler warnings

Fixes following -Wextra compiler warnings:

 uclient.c:195:16: error: comparison of integers of different signs: 'int' and 'unsigned long' [-Werror,-Wsign-compare]
         for (i = 0; i < ARRAY_SIZE(backends); i++) {
                     ~ ^ ~~~~~~~~~~~~~~~~~~~~

 uclient-http.c:619:2: error: comparison of integers of different signs: 'size_t' (aka 'unsigned long') and 'int' [-Werror,-Wsign-compare]
         blobmsg_for_each_attr(cur, uh->headers.head, rem)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 uclient-http.c:619:2: error: comparison of integers of different signs: 'int' and 'unsigned long' [-Werror,-Wsign-compare]
         blobmsg_for_each_attr(cur, uh->headers.head, rem)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 uclient-http.c:993:16: error: comparison of integers of different signs: 'int' and 'unsigned long' [-Werror,-Wsign-compare]
         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
                     ~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~

 uclient.c:195:16: error: comparison of integers of different signs: 'int' and 'unsigned long' [-Werror,-Wsign-compare]
         for (i = 0; i < ARRAY_SIZE(backends); i++) {
                     ~ ^ ~~~~~~~~~~~~~~~~~~~~

 uclient-http.c:619:2: error: comparison of integers of different signs: 'size_t' (aka 'unsigned long') and 'int' [-Werror,-Wsign-compare]
         blobmsg_for_each_attr(cur, uh->headers.head, rem)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 uclient-http.c:619:2: error: comparison of integers of different signs: 'int' and 'unsigned long' [-Werror,-Wsign-compare]
         blobmsg_for_each_attr(cur, uh->headers.head, rem)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 uclient-http.c:993:16: error: comparison of integers of different signs: 'int' and 'unsigned long' [-Werror,-Wsign-compare]
         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
                     ~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~

 uclient-fetch.c:551:67: error: missing field 'flag' initializer [-Werror,-Wmissing-field-initializers]
         [L_NO_CHECK_CERTIFICATE] = { "no-check-certificate", no_argument },

Signed-off-by: Petr Štetiar <ynezz@true.cz>

Add basic cram based unit tests

For the start just basic uclient-fetch functionality coverage.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

cmake: fix building out of the tree

When building out of the tree, linker is unable to find the ubox library
so fix it by using find_library CMake command.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

uclient-fetch: add option to read POST data from file

Passing post data in command line is convenient but has limited size,
and may become tricky to correctly escape passed data especially in
scripts.
This patch add the option --post-file so the data to post can be read
from a file.
Tested on x86/64.

Acked-by: Jo-Philipp Wich <jo@mein.io>
Signed-off-by: Gioacchino Mazzurco <gio@eigenlab.org>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

uclient-fetch: support specifying advertised TLS ciphers

Introduce a new `--ciphers` option which allows specifying a colon separated
list of usable TLS ciphers.

Depending on the underlying ustream-ssl provider, the list either follows
OpenSSL's cipher string format or, in case of mbedTLS, is a simple colon
separated cipher whitelist.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

uclient: Add string error function

This add's the uclient_strerror function, which resolves and error code
to a string message.

Signed-off-by: Daniel Danzberger <daniel@dd-wrt.com>

uclient-http: set data_eof when content-length is 0

Otherwise uclient-fetch can report "Connection reset prematurely"

Fixes FS#2222

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Acked-by: Petr Štetiar <ynezz@true.cz>

uclient-http: properly handle HTTP redirects via proxy connections

When uclient connects via an HTTP proxy connection we need to swap the
contexts .proxy_url and not the .url property (which is the connection
URL to the proxy server itself).

This fixes uclient erroring out in a redirect loop when connecting via
a proxy connection.

Ref: https://forum.openwrt.org/t/opkg-update-fails/25813
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

uclient-http: Close ustream file handle only if allocated

Since the connection setup in uclient_do_connect can fail before
ustream_init_fd is called we must check the fd was actually allocated
before closing it, else we would close STDIN.

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

uclient-utils: Handle memory allocation failure for url file name

Add null pointer check to allocation of url filename

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

uclient-http: Implement error handling for header-sending

Add some error handling for errors during assembly of headers

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

uclient: Handle memory allocation failure for url

Check ptr to url after allocation to prevent null pointer
dereference

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

uclient-http: Handle memory allocation failure

Add null pointer check to allocation of uclient_http struct

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

uclient-http: auth digest: Handle multiple possible memory allocation failures

Add null pointer checks to allocation of buffers for authentication parameters

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

uclient-http: basic auth: Handle memory allocation failure

Allocation of the base64 buffer might fail, resulting in a null
ptr being passed to base64_encode as a target buffer

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

uclient-fetch: Check for nullpointer returned by uclient_get_url_filename

uclient_get_url_filename may return a null ptr resulting in a null
ptr dereference by fprintf and open

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>

uclient-fetch: use package name pattern in message for missing SSL library

When faced with this error message, I did not directly know what
package(s) to install. I first grepped the package list for packages
named libustream-ssl... found nothing, and finally realized, that here
only the library name was mentioned.

But when we mention the certificate packages, why not also directly
mention the SSL/TLS packages with a pattern. That will save one step
next time when stumbling here - at least for me ;-)

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

uclient-fetch: fix overloading of output_file variable

When uclient-fetch is called with multiple URL's, it derives the
first filename from the URL. It then sets the global output_file
variable, causing a use-after-free bug on an attempt to use it as output
file for the next file.

Fix this by avoiding the overwrite entirely by only setting a local
variable

Reported-by: Philip Prindeville <philipp@redfish-solutions.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

uclient-http: fix Host: header for literal IPv6 addresses

For literal IPv6 addresses, the host header must have the form

  Host: [...]

including the square brackets, as it may also contain a port. Some
webservers ignore the missing brackets, while others will return error 400.

IPv6 addresses are determined by searching for ':' characters in the host,
as neither IPv4 addresses nor DNS names can contain colons. An alternative
would be to add a flag to the uclient_url struct; but as this struct is
exposed in public headers, such a change could be considered an ABI change,
making a backport difficult.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Acked-by: Jo-Philipp Wich <jo@mein.io>

uclient-fetch: read_data_cb: fix a potential buffer overflow

When a backend->read() is not implement or returns -1,
This -1 is interpreted as unsigned int resulting
in an access far behind the buffer.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

remove obsolete mac os x /opt/local include/library search path

Where necessary, this can easily be provided through CFLAGS/LDFLAGS

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Fix unused results warnings

Fixes:

uclient-http.c:385:8: error: ignoring return value of 'fread', declared with attribute warn_unused_result [-Werror=unused-result]
   fread(&val, sizeof(val), 1, f);
        ^

uclient-fetch.c: In function 'main':
uclient-fetch.c:664:12: error: ignoring return value of 'asprintf', declared with attribute warn_unused_result [-Werror=unused-result]
    asprintf(&auth_str, "%s:%s", username, password);
            ^
uclient-fetch.c: In function 'read_data_cb':
uclient-fetch.c:269:9: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result]
    write(output_fd, buf, len);

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

uclient-http: send correct "Host:" header if port is set

When connecting to a website with a special port, uclient-fetch connects
to the correct port, but is sending an incorrect Host: header without
the corresponding port.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

Fix printf format in previous commit.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

Make missing SSL support message more explicit.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

http: add support for relative location on redirect

Signed-off-by: Felix Fietkau <nbd@nbd.name>

uclient-fetch: add support for --quiet

Signed-off-by: Felix Fietkau <nbd@nbd.name>

cmake: Find libubox/ustream-ssl.h header file

Add a CMake FIND_PATH and INCLUDE_DIRECTORIES searching for
libubox/ustream-ssl.h.  Some external toolchains which do not include
standard locations would fail to find the header otherwise.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

http: allow sending message body for DELETE request

Sending entity within DELETE is not forbidden by RFC 7231, see section
4.3.5. DELETE:
> A payload within a DELETE request message has no defined semantics;
> sending a payload body on a DELETE request might cause some existing
> implementations to reject the request.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

uclient-fetch: fix inconsistencies in help text (thx, Hannu Nyman)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: use usock_inet_timeout()

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: add support for specifying ipv4/ipv6 preference

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: truncate output files (unless resuming)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: assume data EOF if the connection terminates

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: fix progress bar initialization with -O-

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: fix processing server http data separated by \n instead of \r\n

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: add proper error handling to uclient_http_redirect()

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: allow overwriting files if -O was used

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: fix short command line option for timeout

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: fix connection close handling on auth

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add missing newline after final progress bar update

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

core: fix unused but set variable

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

core: make __uclient_get_url static

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add progress bar support

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add support for setting output directory

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-http: use blocking connect, switch to non-blocking later. fixes ipv6 -> ipv4 fallback

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: detect connect failure

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: ignore SIGPIPE

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add proxy support

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: add proxy support

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

core: add proxy support

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

core: fix memory leak if url change fails

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-http: make username/password variables local

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add support for resuming downloads

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: clean up output file selection

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: allow the header_done callback to reset the client state

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add support for --timeout

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add support for --spider

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add support for --post-data

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: only add default CA entries if no certificate was supplied and verify was requested

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add support for setting the user agent

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add support for fetching multiple urls

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: add user/password to command line help

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: load CA certificates

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: get remote address from usock instead of using getpeername

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: set server_name of the ssl context to support SNI

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

uclient-http: end custom header lines with CRLF

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-http: allow .header_done() callback to reset the connection

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

allow sending requests with DELETE method

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

use const for char buffer in uclient_write

We are not supposed to modify it and ustream accepts const already.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

support for connection timeout

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

http: fix processing of digest auth parameters

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: terminate old connection in uclient_http_connect after incomplete request processing

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

http: do not call uclient_http_disconnect from uclient_notify_eof directly

Depending on the context, it can lead to crashes

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-http: only invoke data_sent callback if it is provided

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

http: ignore empty lines before HTTP response

Fixes HTTP keepalive issues with some servers

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: fix segfault after destination was not reached

Signed-off-by: Luka Perkov <luka@openwrt.org>

http: implement data_sent write callback

Signed-off-by: Luka Perkov <luka@openwrt.org>

http: rework authentication handling - only retry internally for GET requests

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

uclient-fetch: define _GNU_SOURCE (used for asprintf)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: print the URL while connecting

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: add support for --user and --password

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: always use O_EXCL when creating output files, use unlink if -O is specified

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: print download status

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: indicate an error if the connection was terminated prematurely

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

add uclient_get_url_filename helper function

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: print error messages on http error codes

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

fetch: remove http header output

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

rename uclient-example to uclient-fetch

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

example: rename callbacks

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

add support for PUT requests

Signed-off-by: Luka Perkov <luka@openwrt.org>

example: document -q

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

example: only close output fd after request completion if -O was not used

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

example: handle uclient connection errors

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

example: indicate http error presence with return code 8

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

example: close output file

Signed-off-by: Felix Fietkau <nbd@openwrt.org>