Introduce C HTTP server in bincompat mode

bincompat-c-http/.gitignore

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+/workdir/
+/initrd.cpio

bincompat-c-http/.scripts/README.md

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+# Scripts for Bincompat C HTTP server on Unikraft
+
+These are companions instruction to the main instructions in the [`README`](README.md).
+
+Use scripts as quick actions for building and running the bincompat C HTTP server on Unikraft:
+
+**Note**: Run scripts from the application directory.
+
+## Build for <plat> / <arch>:
+
+```console
+./.scripts/build/<plat>.<arch>
+```
+
+e.g.:
+
+```console
+./.scripts/build/qemu.x86_64
+./.scripts/build/fc.x86_64
+```
+
+## Build for <plat> / <arch> using a different compiler
+
+```console
+CC=/path/to/compiler ./.scripts/build/<plat>.<arch>
+```
+
+e.g.
+
+```console
+CC=/usr/bin/gcc-12 ./.scripts/build/qemu.x86_64
+CC=/usr/bin/clang ./.scripts/build/qemu.x86_64
+CC=/usr/bin/gcc-12 ./.scripts/build/fc.x86_64
+CC=/usr/bin/clang ./.scripts/build/fc.x86_64
+```
+
+## Run on <plat> / <arch>
+
+```console
+./.scripts/run/<plat>.<arch>
+```
+
+e.g.
+
+```console
+./.scripts/run/qemu.x86_64
+./.scripts/run/fc.x86_64
+```

bincompat-c-http/.scripts/build/fc.x86_64

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+#!/bin/sh
+
+./.scripts/build/rootfs.x86_64
+./.scripts/build/kernel.fc.x86_64

bincompat-c-http/.scripts/build/kernel.fc.x86_64

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+#!/bin/sh
+
+. ./.scripts/common.sh
+build_elfloader_base fc.x86_64

bincompat-c-http/.scripts/build/kernel.qemu.x86_64

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+#!/bin/sh
+
+. ./.scripts/common.sh
+build_elfloader_base qemu.x86_64

bincompat-c-http/.scripts/build/qemu.x86_64

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+#!/bin/sh
+
+./.scripts/build/rootfs.x86_64
+./.scripts/build/kernel.qemu.x86_64

bincompat-c-http/.scripts/build/rootfs.x86_64

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+#!/bin/sh
+
+rm -f initrd.cpio
+make -C rootfs/ clean
+make -C rootfs/
+./workdir/unikraft/support/scripts/mkcpio initrd.cpio ./rootfs/

bincompat-c-http/.scripts/common.sh

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+#!/bin/sh
+
+elfloader_base="elfloader-net"
+
+if ! test -d workdir; then
+    mkdir workdir
+fi
+
+ln -sfn "../../$elfloader_base/workdir" workdir/base
+
+build_elfloader_base()
+{
+    (
+        cd "../$elfloader_base" &&
+        ./setup.sh &&
+        make distclean &&
+        "./.scripts/build/$1"
+    ) || exit 1
+}

bincompat-c-http/.scripts/run/fc.x86_64

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+#!/bin/sh
+
+if test ! -f initrd.cpio; then
+    echo "No initrd.cpio file found." 1>&2
+    echo "Did you run the build script?" 1>&2
+    exit 1
+fi
+
+base_kernel="workdir/base/build/elfloader_fc-x86_64"
+if test ! -f "$base_kernel"; then
+    echo "No kernel file $base_kernel." 1>&2
+    echo "Did you run the build script?" 1>&2
+    exit 1
+fi
+
+rm -f firecracker.socket
+
+firecracker-x86_64 \
+        --api-sock firecracker.socket \
+        --config-file fc.x86_64.json

bincompat-c-http/.scripts/run/qemu.x86_64

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+#!/bin/sh
+
+if test ! -f initrd.cpio; then
+    echo "No initrd.cpio file found." 1>&2
+    echo "Did you run the build script?" 1>&2
+    exit 1
+fi
+
+base_kernel="workdir/base/build/elfloader_qemu-x86_64"
+if test ! -f "$base_kernel"; then
+    echo "No kernel file $base_kernel." 1>&2
+    echo "Did you run the build script?" 1>&2
+    exit 1
+fi
+
+{
+# Remove previously created network interface.
+sudo ip link set dev virbr0 down
+sudo ip link del dev virbr0
+sudo ip link set dev tap0 down
+sudo ip link del dev tap0
+} > /dev/null 2>&1
+
+# Create bridge interface for QEMU networking.
+sudo ip link add dev virbr0 type bridge
+sudo ip address add 172.44.0.1/24 dev virbr0
+sudo ip link set dev virbr0 up
+
+sudo qemu-system-x86_64 \
+    -nographic \
+    -m 64 \
+    -cpu max \
+    -netdev bridge,id=en0,br=virbr0 -device virtio-net-pci,netdev=en0 \
+    -append "elfloader_qemu-x86_64 netdev.ip=172.44.0.2/24:172.44.0.1::: vfs.fstab=[ \"initrd0:/:extract::ramfs=1:\" ] -- /http_server" \
+    -kernel "$base_kernel" \
+    -initrd ./initrd.cpio

bincompat-c-http/.scripts/test/.gitignore

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+/log/

bincompat-c-http/.scripts/test/README.md

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+# Testing C Hello on Unikraft
+
+These are companion instructions to the main instructions in the [`README`](../../README.md) and to the scripted run instructions in the [`.scripts/README`](../README.md).
+Use these scripts to test C Hello on Unikraft.
+
+**Note**: Run scripts from the application directory.
+
+Use the `all.sh` script to test all builds and all available runs:
+
+```console
+./.scripts/test/all.sh
+```
+
+Logs are stored in the `./.scripts/test/log/` directory.

bincompat-c-http/.scripts/test/all.sh

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+#!/bin/sh
+
+test_build()
+{
+    printf "%-46s ... " build."$1"
+    ./.scripts/build/"$1" > ./.scripts/test/log/build."$1" 2>&1
+    if test $? -eq 0; then
+        echo "PASSED"
+    else
+        echo "FAILED"
+    fi
+}
+
+test_build_run()
+{
+    printf "%-46s ... " build."$1"
+    ./.scripts/build/"$1" > ./.scripts/test/log/build."$1" 2>&1
+    if test $? -eq 0; then
+        echo "PASSED"
+    else
+        echo "FAILED"
+    fi
+
+    printf "    %-42s ... " run."$1"
+    ./.scripts/test/wrapper.sh ./.scripts/run/"$1" 2> ./.scripts/test/log/run."$1"
+}
+
+./setup.sh
+test -d ./.scripts/test/log || mkdir ./.scripts/test/log
+test_build_run qemu.x86_64
+test_build_run fc.x86_64

bincompat-c-http/.scripts/test/common.sh

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+#!/bin/bash
+
+if test -z "$log_file"; then
+    log_file="/dev/null"
+fi
+
+clean_up()
+{
+    {
+    # Clean up any previous instances.
+    sudo pkill -9 qemu-system
+    sudo pkill -9 firecracker
+    kraft stop --all
+    kraft rm --all
+    sudo kraft stop --all
+    sudo kraft rm --all
+
+    # Remove previously created network interfaces.
+    sudo ip link set dev tap0 down
+    sudo ip link del dev tap0
+    sudo ip link set dev virbr0 down
+    sudo ip link del dev virbr0
+    } > /dev/null 2>&1
+}
+
+start_instance()
+{
+    # Start instance.
+    setsid --fork "$start_command" 1>&2 &
+    if test $? -ne 0; then
+        echo "Cannot start instance" 1>&2
+        echo "FAILED"
+        clean_up
+        exit 1
+    fi
+}
+
+test_ping()
+{
+    host="$1"
+
+    # Connect to instance.
+    ping -c 1 "$host" 1>&2
+    if test $? -ne 0; then
+        echo "Cannot ping $host" 1>&2
+        echo "FAILED"
+        clean_up
+        exit 1
+    fi
+}
+
+test_curl_connect()
+{
+    host="$1"
+    port="$2"
+
+    # Query instance.
+    curl --retry 1 --connect-timeout 1 --max-time 10 "$host":"$port" 1>&2
+    if test $? -ne 0; then
+        echo "Cannot connect to $host:$port" 1>&2
+        echo "FAILED"
+        clean_up
+        exit 1
+    fi
+}
+
+test_curl_check_reply()
+{
+    host="$1"
+    port="$2"
+    message="$3"
+
+    # Check server message contents.
+    curl --retry 1 --connect-timeout 1 --max-time 10 "$host":"$port" | grep "$message" 1>&2
+    if test $? -ne 0; then
+        echo "Wrong message from $host:$port" 1>&2
+        echo "FAILED"
+        clean_up
+        exit 1
+    fi
+}
+
+test_netcat_connect()
+{
+    host="$1"
+    port="$2"
+
+    # Check connection.
+    netcat -w 3 "$host" "$port" < /dev/null 1>&2
+    if test $? -ne 0; then
+        echo "Cannot connect to $host:$port" 1>&2
+        echo "FAILED"
+        clean_up
+        exit 1
+    fi
+}
+
+test_redis_connect()
+{
+    host="$1"
+    port="$2"
+
+    redis-cli -h "$host" -p "$port" < /dev/null 1>&2
+    if test $? -ne 0; then
+        echo "Cannot connect client to Redis server at $host:$port" 1>&2
+        echo "FAILED"
+        clean_up
+        exit 1
+    fi
+}
+
+test_redis_cli()
+{
+    host="$1"
+    port="$2"
+
+    redis-cli -h "$host" -p "$port" set a 1 1>&2
+    redis-cli -h "$host" -p "$port" get a 1>&2
+    if test $? -eq 1; then
+        echo "FAILED"
+        echo "Cannot talk to Redis server at $host:$port" 1>&2
+        clean_up
+        exit 1
+    fi
+}
+
+end_with_success()
+{
+    echo "PASSED"
+    clean_up
+    exit 0
+}
+
+start_command="$1"

bincompat-c-http/.scripts/test/wrapper.sh

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+#!/bin/sh
+
+. ./.scripts/test/common.sh
+
+if test $# -ne 1; then
+    echo "Unknown arguments." 1>&2
+    echo "Usage: $0 <start_command>" 1>&2
+    exit 1
+fi
+
+# Clean up previous instances.
+clean_up
+
+# Start instance.
+start_instance 2>&1 | grep "Hello from Unikraft!" 1>&2
+if test $? -ne 0; then
+    echo "Wrong message printed." 1>&2
+    echo "FAILED"
+    clean_up
+    exit 1
+fi
+
+# Stop instance.
+end_with_success