This coursework project consists of several parts:
- HTTP client supporting HTTP/1.1 GET and PUT methods with local files.
- HTTP server supporting HTTP/1.1: ** GET and PUT methods with local files. ** DNS resolver queries.
- DNS resolver client supporting stub resolver queries to a given resolver.
- Limited tests for the internal components.
Building utilizes the following dependencies (Debian package names given):
libpcl1-dev
Using the supplied Makefile should be enough to build the bin/client binary:
$ make
The code has been built on the following OS/Distributions:
Ubuntu 12.04.3 LTS amd64
Debian GNU/Linux 7.0 (wheezy) amd64
Building requires GCC 4.6 or newer, with support for -std=gnu99 and -D _POSIX_C_SOURCE=200112L
GCC 4.4 will not work due to gcc bug #10676.
The supplied Makefile supports some additional build configuration options for various debugging configurations.
The client optionally supports https:// URLs using OpenSSL.
$ make -B SSL=1
The libssl-dev headers must be available:
libssl-dev
The server does NOT provide https support.
Due to the use of multiple stacks, running the server under valgrind will report spurious errors. This can be avoided with the use of special valgrind-specific instrumentation to register the separate stack frames:
$ make -B VALGRIND=1
The valgrind headers are included in the valgrind package:
valgrind
$ ./bin/client -h
Usage: ./bin/client [options] <url> [<url>] [...]
-h --help Display this text
-q --quiet Less output
-v --verbose More output
-d --debug Debug output
-G --get=file GET to file
-P --put=file PUT from file
-F --post=form-data POST form data from string
-I --iam=username Send Iam header
--http-11 Send HTTP/1.1 requests
-j --parallel Perform requests in parallel
The client will by default send an additional Iam: header in the request, containing the login username of the system
user running the process.
./bin/client -q http://www.ietf.org/rfc/rfc2616.txt
./bin/client -G rfc2616.txt http://www.ietf.org/rfc/rfc2616.txt
./bin/client -P test.txt http://nwprog1.netlab.hut.fi:3000/test.txt
./bin/client -F 'name=example.com&type=A' http://localhost:8080/dns-query/
./bin/client --http-11 http://example.com/foo /bar
./bin/client -j http://example.com/foo http://example.com/bar
Note that this is of fairly limited use pending a mechanism to provide a separate output file for each request. The repsonse data will be arbitrarily intermixed between requests. No inter/intra -request ordering is guaranteed.
The server does not provide any defaults for <listen>, --daemon or --static/upload, and these must be
explicitly given. Running the server without any arguments will simply exit immediately.
$ ./bin/server -h
Usage: ./bin/server [options] <listen> [<listen>] [...]
-h --help Display this text
-q --quiet Less output
-v --verbose More output
-d --debug Debug output
-L --log-file Write log to given file
-D --daemon Daemonize
-N --nfiles Limit number of open files
-I --iam=username Send Iam header
-S --static=path Serve static files from /
-U --upload=path Accept PUT files to /upload
-P --dns Serve POST requests to /dns-query
-R --resolver DNS resolver address
The server will by default send an additional Iam: header in the response, containing the login username of the system
user running the process.
$ ./bin/server -v localhost:8080 -S public/
$ ./bin/server -v localhost:8080 ip6-localhost:8080 -S public/
$ ./bin/server -v [::]:8080 -S public/
$ ./bin/server :1340 --static public/ --upload public/upload/ --daemon
$ ./bin/server --static public/ --dns localhost:8081 -v
The DNS client can be used as a simple stub resolver for testing, or to lookup large numbers of domains simultaneously.
$ ./bin/dns -h
Usage: ./bin/dns [options] <host> [<host>] [...]
-h --help Display this text
-q --quiet Less output
-v --verbose More output
-d --debug Debug output
-R --resolver DNS resolver address
$ ./bin/dns example.com
example.com has address 93.184.216.119
example.com has IPv6 address 2606:2800:220:6d:26bf:1447:1097:aa7
$ ./bin/dns example.com example.net
example.com has address 93.184.216.119
example.net has address 93.184.216.119
example.com has IPv6 address 2606:2800:220:6d:26bf:1447:1097:aa7
example.net has IPv6 address 2606:2800:220:6d:26bf:1447:1097:aa7
Note that the ordering of results is not specified, and may vary.
The code includes some simple tests for some of the functionality, mostly related to string parsing:
$ make test