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A pure C gopher server implementation

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A pure gopherd server implementation
===

This is a simple, minimal implementation of a **Gopher server** written in pure C that follow the reference:

* [RFC1436](https://tools.ietf.org/html/rfc1436)

It's supposed to simply serve the content you specify defining a root directory in the _defaults.def.h_
file.

Build from SRC
---

You can simply build it using the provided Makefile. 
According to the defined _$PREFIX_, the default _all_ target generates a bin/ directory
containing the result of the compilation. 
The _config_ target is useful to generate a _lib/defaults.h_ with all the user-defined
parameters. 
For example, __GROOT__ is the definition of the path that provides the content that should
be served by this server: customize that value before building the project and make sure
it's a valid path containing the gophermap and all the other resources to be exposed. 
Before building the server, take some time to review the content of _lib/defaults.def.h_
and customize the provided values.

$ make help

will show all the available targets.

$ make config

will generate the defaults.h according to the defaults.def.h

$ make

will compile and put the result in $(PREFIX) dir.

USAGE
---

$ ./c_gopherd -h
    Usage ./bin/c_gopherd [-h host] [-p port] [-v]

THE GOPHER PROTOCOL AND DATA TYPES
---
In the /example folder there is a little Gophermap file. 
By customizing the **GOPHER_ROOT** directory (aka *GROOT*)
you can serve it as an *HTML equivalent index*. 
In this way you can display your custom Gopher menu instead of just a directory listing. 
A good approach enabled by the use of the gophermap is represented by the ability to create
nested [gopherholes](https://gopher.zone/posts/tutorial-for-absolute-beginners) indexed with
their own gophermap in a structure like the following:

example/
      gophermap
      user1/
        gophermap
        user_1_content/
      user2
        gophermap
        user_2_content/
      content1/
      content2.txt
      ...
      ...

How the gophermap is built?
---

According to the rfc and the evolution of the protocol, the following table specifies the format and the content types
allowed. 
The technical specification for Gopher, RFC 1436, defines 14 item types. A one-character code indicates what kind of
content the client should expect. 
Item type 3 is an error code for exception handling. Gopher client authors improvised item types h (HTML),
i (informational message), and s (sound file) after the publication of RFC 1436, and I think the informational message
is very useful to organize better a gophermap and present the resources in a cleaner way.

| Type   |      Description      |
|:----------:|:-------------|
| 0 | text file |
| 1 | Gopher submenu   |
| 2 | CCSO Nameserver |
| 3 | Error code returned by a Gopher server to indicate failure |
| 4 | BinHex-encoded file (primarily for Macintosh computers)   |
| 5 | DOS Files |
| 6 | uuencoded file |
| 7 | Gopher full-text search   |
| 8 | Telnet |
| 9 | Binary file |
| + | Mirror or alternate server (for load balancing or in case of primary server downtime)   |
| g | GIF file |
| I | Image file |
| T | Telnet 3270 |
| i | informational message |
| h | HTML file |
| s | Sound file |

An example of gophermap can be [found here](example/gophermap).

TODO LIST
---
Here the [todo list](TODO) containing the list of the next features we MUST have.

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