This is the completed C backend with all functions tested to work. Any
suggestions as to modifications are welcome.
The C code:
-----------------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
//using namespace std;
#define opSave 0
#define opSaveConnect 1
#define opQueryConnect 2
#define opDeleteConnect 3
#define opConnectionConnect 4
#define opDisconnectActiveConnection 5
#define opScan 6
#define opLoadExisting 7
const
char* path_to_interfaces_files = "/etc/network/wifi";
/*
1) Glib::spawn_sync instead of a pipe stream, provides a slot.
2) cmd trying to call an inexistent command still returns a valid pointer!
verify cmd exists before calling exec
*/
inline int file_exists(char* name) {
return (access(name, F_OK) != -1);
}
int exec(const char* cmd, char* out)
{
const int buf_size = 128;
FILE * pipe = popen(cmd, "r");
char buffer[buf_size];
while(!feof(pipe)) {
if(fgets(buffer, buf_size, pipe) != NULL)
{
if (out != NULL)
strcat(out, buffer);
else strcpy(out, buffer);
}
}
return pclose(pipe);
}
/* Interfaces file sample
auto lo
iface lo inet loopback
# The primary network interface
# allow-hotplug eth0
iface eth0 inet dhcp
# WIFI Configuration
# auto wlan0
iface wlan0 inet dhcp
wpa-ssid ESSID
wpa-psk "password"
*/
int saveFile(char* essid, char* pw) //argv[2], argv[3]
{
char ifilename[1024];
strcpy(ifilename, path_to_interfaces_files);
strcat(ifilename, "/");
strcat(ifilename, essid);
FILE *fp = fopen(ifilename, "ab+");
char text[1024];
strcpy(text, "auto lo\n");
fprintf(fp, text);
strcpy(text, "iface lo inet loopback\n\n");
fprintf(fp, text);
strcpy(text, "iface wlan0 inet dhcp\n");
fprintf(fp, text);
strcpy(text, " wpa-ssid ");
strcat(text, essid);
strcat(text, "\n");
fprintf(fp, text);
strcpy(text, " wpa-psk \"");
strcat(text, pw);
strcat(text, "\"\n");
fprintf(fp, text);
fclose(fp);
}
int connectionConnect(char* essid) //argv[2]
{
char* s = 0;
char ifilename[1024];
strcpy(ifilename, path_to_interfaces_files);
strcat(ifilename, "/");
strcat(ifilename, essid);
char command[1024];
strcpy(command, "/sbin/ifup wlan0 -i ");
strcat(command, ifilename);
printf(command);
int q = exec(command, s);
printf(s);
return q;
}
int queryConnect(char* essid) //argv[2]
{
char s[50*1024];
char command[1024];
strcpy(command, "/bin/cat /etc/network/wifi/");
strcat(command, essid);
strcat(command, " | grep -A 1 wpa-ssid");
int q = exec(command, s);
printf(s);
return q;
}
int deleteConnect(char* essid) //argv[2]
{
//char* s = 0;
char command[1024];
strcpy(command, "/bin/rm /etc/network/wifi/");
strcat(command, essid);
int q = exec(command, 0);
//printf(s);
return q;
}
int disconnectActiveConnection()
{
char* s = 0;
char command[1024];
strcpy(command, "/sbin/ifdown wlan0");
int q = exec(command, s);
printf(s);
return q;
}
int scan()
{
char s[50*1024];
char command[1024];
strcpy(command, "/sbin/iwlist wlan0 scanning | /bin/grep
ESSID");
int q = exec(command, s);
printf(s);
return q;
}
int loadExisting()
{
DIR *dir;
struct dirent *ent;
if ((dir = opendir ("/etc/network/wifi")) != 0)
{
while ((ent = readdir (dir)) != 0)
if (!(strcmp(".", ent->d_name) == 0 || strcmp("..",
ent->d_name) == 0))
printf ("%s\n", ent->d_name);
closedir (dir);
return 0;
}
else
{
perror ("");
return EXIT_FAILURE;
}
}
int main(int argc, char *argv[])
{
char *out = 0;
int switch_item = -1, i;
if (argc > 1) switch_item = atoi(argv[1]);
switch (switch_item) {
case opSave:
i = saveFile(argv[2], argv[3]);
//printf(out);
return i;
case opSaveConnect:
i = saveFile(argv[2], argv[3]);
if (i == 0) i = connectionConnect(argv[2]);
return i;
case opQueryConnect:
i = queryConnect(argv[2]);
return i;
case opDeleteConnect:
i = deleteConnect(argv[2]);
return i;
case opConnectionConnect:
i = connectionConnect(argv[2]);
return i;
case opDisconnectActiveConnection:
i = disconnectActiveConnection();
return i;
case opScan:
i = scan();
return i;
case opLoadExisting:
i = loadExisting();
return i;
}
return -1; // parameter not in range
}
----------------------------
=====================================
On 19/08/2015, Edward Bartolo <[email protected]> wrote:
> Ok, so it will be a separate interfaces file for every essid. I am
> proposing to place them under /etc/network/wifi-interfaces.
>
> I have just used my embryonic network manager to connect without
> typing the root password by pressing the connect button.
>
> On 19/08/2015, Steve Litt <[email protected]> wrote:
>> On Tue, 18 Aug 2015 20:43:18 +0100
>> Edward Bartolo <[email protected]> wrote:
>>
>>> A) I am at the stage of trying to understand these:
>>> a) iw_sockets_open
>>> b) iw_get_range_info
>>> c) iw_scan
>>
>> Are those commands, or part of a C library? The only things I'm
>> familiar with is commands iwlist and iwconfig, as well as the ip and
>> ifconfig commands. "iwlist wlan1 scanning" at the command line or from
>> a shellscript or system() or fork() ore exec() is how you get a list of
>> essids and their strengths and encryption types.
>>
>>>
>>> The goal is to avoid to have the least number of dependencies.
>>
>> I think iwlist/iwconfig are supplied by one dependency.
>>
>>>
>>>
>>> B) I have yet another tempting idea. This is to use only one file for
>>> the essids and corresponding passwords. However, this would force me
>>> to somehow trick ifup into thinking it is being passed an interfaces
>>> file instead of the output from an executable.
>>
>> What's the benefit of only one file? Having them in one file requires
>> parsing. It makes it easier for the manual user to wreck all wifi with
>> a typo in one file, and he doesn't even have the troubleshooting
>> advantage of being able to compare a working and non-working interface
>> files. It would make it harder to use Vim to insert another interface
>> for troubleshooting purposes. Assuming I had essids reseda, library and
>> mcdonalds, I'd do this:
>>
>> /path/to/wifi/interfaces/library
>> /path/to/wifi/interfaces/reseda
>> /path/to/wifi/interfaces/mcdonalds
>>
>> That's the djb way, it makes programming trivial, it makes
>> troubleshooting pretty easy, and it uses the tools Unix gave you to
>> best possible advantage.
>>
>> Meanwhile, I see absolutely no advantage to putting them all in one
>> file.
>>
>>>
>>> Here is the command:
>>> ifup wlan0 -i $(tricky-executable(essid))
>>>
>>> tricky-executable would pass a series of text lines as they would
>>> appear in a dedicated interfaces file.
>>>
>>> I found it: it is not the above as that does not work. But this does
>>> work. :) cat /etc/network/interfaces | ifup wlan0
>>>
>>> What do you think.
>>
>> I'd have separate interface files for each essid.
>>
>> SteveT
>>
>> Steve Litt
>> August 2015 featured book: Troubleshooting: Just the Facts
>> http://www.troubleshooters.com/tjust
>>
>
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