get_node_info()

The goal of get_node_info() is to read node information from the file nodeinfo.txt. Each line in this file contains a node name and an IP address separated by a semicolon. For example, the file looks like this:

nodeA;10.1.1.1
nodeB;10.1.1.2
nodeC;10.1.1.3
nodeD;10.1.1.4

Each line means there is a node in the network named nodeA with IP address 10.1.1.1, and so on.

How do we do this?

To read the nodes from the text file, you need to:

1. File I/O:

   • Open the file using fopen().

2. Input Parsing:

   • Use fgets() to read each line.

   • Use sscanf() to extract the node name and IP address from each line.

3. Node Insertion (Linked List):

   • For each node, create a new node_t structure.

   • Insert the new node into a linked list in alphabetical order by name.

4. Error Handling:

   • If the file cannot be opened, print an error message and return a non-zero value.

   • Otherwise, return 0 on success.