Squid Programmers Guide

Duane Wessels, Squid Developers

1. Introduction

• 1.1 Conventions

2. Overview of Squid Components

• 2.1 Client Side
• 2.2 Server Side
• 2.3 Storage Manager
• 2.4 Request Forwarding
• 2.5 Peer Selection
• 2.6 Access Control
• 2.7 Network Communication
• 2.8 File/Disk I/O
• 2.9 Neighbors
• 2.10 IP/FQDN Cache
• 2.11 Cache Manager
• 2.12 Network Measurement Database
• 2.13 Redirectors
• 2.14 Autonomous System Numbers
• 2.15 Configuration File Parsing
• 2.16 Callback Data Database
• 2.17 Debugging
• 2.18 Error Generation
• 2.19 Event Queue
• 2.20 Filedescriptor Management
• 2.21 Hashtable Support
• 2.22 HTTP Anonymization
• 2.23 Internet Cache Protocol
• 2.24 Ident Lookups
• 2.25 Memory Management
• 2.26 Multicast Support
• 2.27 Persistent Server Connections
• 2.28 Refresh Rules
• 2.29 SNMP Support
• 2.30 URN Support

3. External Programs

• 3.1 dnsserver
• 3.2 pinger
• 3.3 unlinkd
• 3.4 redirector

4. Flow of a Typical Request

5. Callback Functions

6. The Main Loop: comm_select()

7. Processing Client Requests

8. Storage Manager

9. Filesystem Interface

• 9.1 Introduction
• 9.2 The Interface

10. Forwarding Selection

11. IP Cache and FQDN Cache

• 11.1 Introduction
• 11.2 Data Structures
• 11.3 External overview
• 11.4 Internal Operation

12. Server Protocols

• 12.1 HTTP
• 12.2 FTP
• 12.3 Gopher
• 12.4 Wais
• 12.5 SSL
• 12.6 Passthrough

13. Timeouts

14. Events

15. Access Controls

16. ICP

17. Network Measurement Database

18. Error Pages

19. Callback Data Database

20. Cache Manager

21. HTTP Headers

• 21.1 General remarks
• 21.2 Life cycle
• 21.3 Header Manipulation.
• 21.4 I/O and Headers.
• 21.5 Adding new header-field ids.
• 21.6 A Word on Efficiency.

22. File Formats

• 22.1 swap.state

23. Store ``swap meta'' Description

• 23.1 Types
• 23.2 Implementation Notes