commit: 3527ac7133512a5ad3f72564ef03de64b2355a38
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date: Fri, 31 May 2024 20:14:06 +0200
init
Diffstat:
| A | .gitignore | 2 | ++ |
| A | LICENSES/MPL-2.0.txt | 373 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | Makefile | 9 | +++++++++ |
| A | README.md | 18 | ++++++++++++++++++ |
| A | configure | 132 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | httpc.c | 122 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
6 files changed, 656 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+/config.mk
+/httpc
diff --git a/LICENSES/MPL-2.0.txt b/LICENSES/MPL-2.0.txt
@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+ means each individual or legal entity that creates, contributes to
+ the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+ means the combination of the Contributions of others (if any) used
+ by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+ means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+ means Source Code Form to which the initial Contributor has attached
+ the notice in Exhibit A, the Executable Form of such Source Code
+ Form, and Modifications of such Source Code Form, in each case
+ including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+ means
+
+ (a) that the initial Contributor has attached the notice described
+ in Exhibit B to the Covered Software; or
+
+ (b) that the Covered Software was made available under the terms of
+ version 1.1 or earlier of the License, but not also under the
+ terms of a Secondary License.
+
+1.6. "Executable Form"
+ means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+ means a work that combines Covered Software with other material, in
+ a separate file or files, that is not Covered Software.
+
+1.8. "License"
+ means this document.
+
+1.9. "Licensable"
+ means having the right to grant, to the maximum extent possible,
+ whether at the time of the initial grant or subsequently, any and
+ all of the rights conveyed by this License.
+
+1.10. "Modifications"
+ means any of the following:
+
+ (a) any file in Source Code Form that results from an addition to,
+ deletion from, or modification of the contents of Covered
+ Software; or
+
+ (b) any new file in Source Code Form that contains any Covered
+ Software.
+
+1.11. "Patent Claims" of a Contributor
+ means any patent claim(s), including without limitation, method,
+ process, and apparatus claims, in any patent Licensable by such
+ Contributor that would be infringed, but for the grant of the
+ License, by the making, using, selling, offering for sale, having
+ made, import, or transfer of either its Contributions or its
+ Contributor Version.
+
+1.12. "Secondary License"
+ means either the GNU General Public License, Version 2.0, the GNU
+ Lesser General Public License, Version 2.1, the GNU Affero General
+ Public License, Version 3.0, or any later versions of those
+ licenses.
+
+1.13. "Source Code Form"
+ means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+ means an individual or a legal entity exercising rights under this
+ License. For legal entities, "You" includes any entity that
+ controls, is controlled by, or is under common control with You. For
+ purposes of this definition, "control" means (a) the power, direct
+ or indirect, to cause the direction or management of such entity,
+ whether by contract or otherwise, or (b) ownership of more than
+ fifty percent (50%) of the outstanding shares or beneficial
+ ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+ Licensable by such Contributor to use, reproduce, make available,
+ modify, display, perform, distribute, and otherwise exploit its
+ Contributions, either on an unmodified basis, with Modifications, or
+ as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+ for sale, have made, import, and otherwise transfer either its
+ Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+ or
+
+(b) for infringements caused by: (i) Your and any other third party's
+ modifications of Covered Software, or (ii) the combination of its
+ Contributions with other software (except as part of its Contributor
+ Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+ its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+ Form, as described in Section 3.1, and You must inform recipients of
+ the Executable Form how they can obtain a copy of such Source Code
+ Form by reasonable means in a timely manner, at a charge no more
+ than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+ License, or sublicense it under different terms, provided that the
+ license for the Executable Form does not attempt to limit or alter
+ the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+* *
+* 6. Disclaimer of Warranty *
+* ------------------------- *
+* *
+* Covered Software is provided under this License on an "as is" *
+* basis, without warranty of any kind, either expressed, implied, or *
+* statutory, including, without limitation, warranties that the *
+* Covered Software is free of defects, merchantable, fit for a *
+* particular purpose or non-infringing. The entire risk as to the *
+* quality and performance of the Covered Software is with You. *
+* Should any Covered Software prove defective in any respect, You *
+* (not any Contributor) assume the cost of any necessary servicing, *
+* repair, or correction. This disclaimer of warranty constitutes an *
+* essential part of this License. No use of any Covered Software is *
+* authorized under this License except under this disclaimer. *
+* *
+************************************************************************
+
+************************************************************************
+* *
+* 7. Limitation of Liability *
+* -------------------------- *
+* *
+* Under no circumstances and under no legal theory, whether tort *
+* (including negligence), contract, or otherwise, shall any *
+* Contributor, or anyone who distributes Covered Software as *
+* permitted above, be liable to You for any direct, indirect, *
+* special, incidental, or consequential damages of any character *
+* including, without limitation, damages for lost profits, loss of *
+* goodwill, work stoppage, computer failure or malfunction, or any *
+* and all other commercial damages or losses, even if such party *
+* shall have been informed of the possibility of such damages. This *
+* limitation of liability shall not apply to liability for death or *
+* personal injury resulting from such party's negligence to the *
+* extent applicable law prohibits such limitation. Some *
+* jurisdictions do not allow the exclusion or limitation of *
+* incidental or consequential damages, so this exclusion and *
+* limitation may not apply to You. *
+* *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+ This Source Code Form is subject to the terms of the Mozilla Public
+ License, v. 2.0. If a copy of the MPL was not distributed with this
+ file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+ This Source Code Form is "Incompatible With Secondary Licenses", as
+ defined by the Mozilla Public License, v. 2.0.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: MPL-2.0
+include config.mk
+
+httpc: httpc.c
+ ${CC} -std=c99 ${CFLAGS} ${DEPS_cflags} -o $@ $< ${LDFLAGS} ${DEPS_libs}
+
+.PHONY: clean
+clean:
+ rm httpc
diff --git a/README.md b/README.md
@@ -0,0 +1,18 @@
+# httpc: HTTP Client
+
+A barebones HTTP client, intended for simple usage like downloading files.
+
+## Dependencies
+- C99 Compiler
+- POSIX Shell and C library
+- pkg-config(1)
+- `libtls` implementation, for example:
+ - <https://www.libressl.org/> (included in OpenBSD)
+ - libtls for OpenSSL: <https://git.causal.agency/libretls/about/>
+ - libtls for BearSSL: <https://sr.ht/~mcf/libtls-bearssl/>
+
+## Non-Goals
+- Other protocols than HTTP(S)
+- curl/wget/… compatibility
+- Decompression
+- Cookie files
diff --git a/configure b/configure
@@ -0,0 +1,132 @@
+#!/bin/sh
+# SPDX-FileCopyrightText: 2019 Haelwenn (lanodan) Monnier <contact+httpc@hacktivis.me>
+# SPDX-License-Identifier: MPL-2.0
+
+DEPS="libtls"
+
+arg0="$0"
+args="$@"
+
+usage() {
+cat <<END
+Usage: [variables] configure [variables]
+
+Variables:
+ PREFIX=DIR
+ BINDIR=DIR
+ MANDIR=DIR
+
+ PKGCONFIG=BIN
+ CC=BIN
+ CFLAGS=OPTIONS
+ LDFLAGS=OPTIONS
+
+Variables are set in the following order: Default, Environment, Arguments
+
+Dependencies: See README.md
+END
+}
+
+is_ok() {
+ status="$?"
+
+ if test $status -eq 0; then
+ printf " OK\n"
+ else
+ printf " FAIL\n"
+ fi
+
+ return $status
+}
+
+required() {
+ is_ok || exit 1
+}
+
+pkg_config_check() {
+ printf 'Checking: %s %s ...' "${PKGCONFIG}" "$*"
+ "${PKGCONFIG}" "$@"
+ is_ok
+}
+
+## User configuration
+
+# defaults
+: ${PREFIX:=/usr/local}
+: ${PKGCONFIG:=pkg-config}
+: ${CC:=cc}
+: ${CFLAGS:=-g -O2 -D_FORTIFY_SOURCE=2}
+
+# Also allow variables through arguments
+for i; do
+ case "$i" in
+ -h|--help)
+ usage
+ exit 1
+ ;;
+ -*)
+ printf "Unknown argument ‘%s’\n" "${i}"
+ usage
+ exit 1
+ ;;
+ *=*)
+ # shellcheck disable=SC2163
+ export "$i"
+ shift
+ ;;
+ *)
+ printf "Unknown argument ‘%s’\n" "${i}"
+ usage
+ exit 1
+ ;;
+ esac
+done
+
+# Fallback definitions for dirs, based on $PREFIX
+: ${BINDIR:=${PREFIX}/bin}
+: ${MANDIR:=${PREFIX}/share/man}
+
+## System checks
+# commands
+printf 'Checking %s command existance ...' "${PKGCONFIG}"
+command -v "${PKGCONFIG}" >/dev/null ; required
+
+printf 'Checking %s command existance ...' "${CC}"
+command -v "${CC}" >/dev/null ; required
+
+echo
+
+# pkg-config
+for dep in ${DEPS}
+do
+ pkg_config_check --exists "$dep" || exit 1
+done
+
+printf 'Using pkg-config to get CFLAGS for %s ...' "${DEPS}"
+get_cflags() { "${PKGCONFIG}" --cflags "${DEPS}"; }
+DEPS_cflags="$(get_cflags)"
+required
+
+printf 'Using pkg-config to get LIBS for %s ...' "${DEPS}"
+get_libs() { "${PKGCONFIG}" --libs "${DEPS}"; }
+DEPS_libs="$(get_libs)"
+required
+
+echo
+
+## Configuration write
+printf 'Writing to config.mk ...'
+cat >config.mk <<EOF
+# Autogenerated by $arg0 $args
+PREFIX = ${PREFIX}
+CC = ${CC}
+CFLAGS = ${CFLAGS}
+LDFLAGS = ${LDFLAGS}
+
+DEPS_cflags = ${DEPS_cflags}
+DEPS_libs = ${DEPS_libs}
+EOF
+
+is_ok
+
+echo 'Done, you can now run make'
diff --git a/httpc.c b/httpc.c
@@ -0,0 +1,122 @@
+// SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+httpc@hacktivis.me>
+// SPDX-License-Identifier: MPL-2.0
+#define _POSIX_C_SOURCE 200809L
+
+#include <limits.h> // PAGESIZE
+#include <tls.h>
+#include <stdio.h> // fprintf
+#include <unistd.h> // write
+#include <string.h> // strlen
+#include <stdlib.h> // abort
+
+int body = 0;
+
+static size_t
+read_header(const char *res, ssize_t len)
+{
+ size_t header_len = 0;
+
+ for(ssize_t i = 0; i<len; i++)
+ {
+ if(res[i] == '\r' && res[i+1] == '\n') i++;
+
+ if(res[i] == '\n')
+ {
+ if(header_len == 0)
+ {
+ body = 1;
+ return i+1;
+ }
+
+ fwrite(res, 1, header_len, stderr);
+ fputs("\n", stderr);
+
+ return i+1;
+ }
+
+ header_len++;
+ }
+
+ // Maybe case where first packet didn't contain all headers should be handled
+ // But who the heck even sends >PAGESIZE of headers
+ abort();
+}
+
+int
+main(int argc, char *argv[])
+{
+ const char *hostname = "lanodan.eu";
+ const char *target = "/";
+ const char *port = "443";
+
+ struct tls *tls_ctx = tls_client();
+ struct tls_config *tls_cfg = tls_config_new();
+
+ if(tls_configure(tls_ctx, tls_cfg) != 0)
+ {
+ fprintf(stderr, "httpc: TLS Configuration Error: %s\n", tls_error(tls_ctx));
+ tls_config_free(tls_cfg);
+ return 1;
+ }
+
+ if(tls_connect(tls_ctx, hostname, port) != 0)
+ {
+ fprintf(stderr, "httpc: TLS Connection Error: %s\n", tls_error(tls_ctx));
+ tls_config_free(tls_cfg);
+ return 1;
+ }
+
+ if(tls_handshake(tls_ctx) != 0)
+ {
+ fprintf(stderr, "httpc: TLS Handshake Error: %s\n", tls_error(tls_ctx));
+ goto cleanup;
+ }
+
+ static const char *req_fmt = "\
+GET %s HTTP/1.0\r\n\
+Host: %s\r\n\
+User-Agent: httpc/0.0\r\n\
+Connection: close\r\n\
+\r\n";
+ char req[PAGESIZE];
+
+ snprintf(req, PAGESIZE, req_fmt, target, hostname);
+
+ ssize_t nwrite = tls_write(tls_ctx, req, strlen(req));
+ if(nwrite < 0)
+ {
+ fprintf(stderr, "httpc: Write Error: %s\n", tls_error(tls_ctx));
+ goto cleanup;
+ }
+
+ char res[PAGESIZE] = {};
+ while(1)
+ {
+ ssize_t nread = tls_read(tls_ctx, res, PAGESIZE);
+
+ if(nread == TLS_WANT_POLLIN || nread == TLS_WANT_POLLOUT)
+ continue;
+
+ if(nread < 0)
+ {
+ fprintf(stderr, "httpc: Write Error: %s\n", tls_error(tls_ctx));
+ break;
+ }
+
+ if(nread == 0) break;
+
+ ssize_t off = 0;
+
+ // TODO: Read status
+ while(body == 0 && off < nread) off += read_header(res+off, nread);
+
+ if(body == 1) write(STDOUT_FILENO, res+off, nread-off);
+ }
+
+cleanup:
+ tls_close(tls_ctx);
+ tls_free(tls_ctx);
+ tls_config_free(tls_cfg);
+
+ return 0;
+}
