I added another function to core_functions.c. It attempts to connect
to eth0 but for some weird reason, probably a bug not from our part,
it is failing.
The function is: int connectWired(const char ethx)
And the error is: (passed command to execl is "ifup eth0")
"This command should be called as ifup, ifdown, or ifquery"
Any pointers as to what is the cause are appreciated.
Edward
On 27/08/2015, Steve Litt <[email protected]> wrote:
> On Thu, 27 Aug 2015 14:18:02 +0100
> Edward Bartolo <[email protected]> wrote:
>
>>
>> Now, in the case of frequently changing wifi hotspots, the frontend
>> need to be made to detect that a different wifi hotspot is required.
>> This can be achieved with TTimer calling a subroutine regularly in
>> which a connection is tested, and in case the active wifi is
>> unreachable, other wifi's are tried starting with the strongest
>> signal. In case, no essid file is found, the user is prompted to enter
>> password and essid. However, this can become a nuisance, so we have to
>> decide where to stop regarding automating wifi connections.
>
> You're right.
>
> Probably something in the network software sends a message (besides the
> one sent to dbus) indicating that the current active wifi just
> disconnected, and if that can be redirected to your software, that
> pretty much does the job.
>
> SteveT
>
> Steve Litt
> August 2015 featured book: Troubleshooting: Just the Facts
> http://www.troubleshooters.com/tjust
>
/*
netman - A Network Connection Manager
Copyright (C) 2015 Edward Bartolo
"netman" is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
"netman" is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with "netman". If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <alloca.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "core_functions.h"
#include "essid_encoder.h"
#include "paths.h"
#define SIMPLE_SCAN_OPT ""
//#define POWER_SCAN_OPT "-B 4"
int connectWired(
const char * ethx
) {
int err;
int valid_eth = 0;
if (ethx == NULL)
return 107; // ethx is NULL
char ethN[10];
strcpy(ethN, "eth");
valid_eth = (strncmp(ethN, ethx, 3) == 0);
if (valid_eth && (strlen(ethx) > 3 && strlen(ethx) < 6)) {
if (strlen(ethx) == 4) {
valid_eth = isdigit(ethx[3]);
} else {
valid_eth = ethx[3] != '0' && isdigit(ethx[3]) && isdigit(ethx[4]);
}
}
if (!valid_eth) {
fprintf(stderr, "ERROR: ethX not recognized.\n");
return 106; //ethx not recognized
}
err = execl("/sbin/ifup", ethx, (char *) NULL);
fprintf(
stderr,
"ERROR: connectWired(): "
"\"/sbin/ifup %s\" failed; err=%d\n",
ethx, err
);
return err;
}
int connectionConnect(
const char * essid
) {
char filename[1024];
char * encoded_essid;
int err;
err = encode_essid_alloc(essid, &encoded_essid);
if(err!=0) {
fprintf(stderr, "ERROR: essid_encode_alloc(essid=%s) failed; err=%d\n", essid, err);
return err;
}
err = encode_essid(essid, &encoded_essid);
if(err!=0) {
fprintf(stderr, "ERROR: essid_encode(essid=%s) failed; err=%d\n", essid, err);
return err;
}
err = snprintf(filename, 1024, "%s/%s", IFACES_PATH, encoded_essid);
if(err<0) {
fprintf(stderr, "ERROR: snprintf(filename) failed; err=%d\n", err);
return err;
}
fprintf(stderr, "DEBUG: now executing: /sbin/ifup wlan0 -i %s\n", filename); // DEBUG
err = execl("/sbin/ifup", "ifup", "wlan0", "-i", filename, (char *) NULL);
fprintf(
stderr,
"ERROR: connectionConnect(): "
"\"/sbin/ifup wlan0 -i %s\" failed; err=%d\n",
filename, err
);
return err;
}
int disconnectActiveConnection()
{
int err = execl("/sbin/ifdown", "ifdown", "wlan0", (char *) NULL);
fprintf(
stderr,
"ERROR: disconnectActiveConnection(): "
"\"/sbin/ifdown wlan0\" failed; err=%d\n",
err
);
return err;
}
int power_scan(scan_type scan)
{
const char *command_up = "/sbin/ifconfig wlan0 up";
int status;
FILE * shell_reader;
char * scan_buffer;
int err;
scan_buffer = calloc(1024, 1);
if(!scan_buffer) {
fprintf(
stderr,
"ERROR: power_scan(): "
"could not allocate 104 bytes for scan_buffer (Error: %s)\n",
strerror(errno)
);
return -1;
}
status = system(command_up);
if(status==-1 || !WIFEXITED(status)) {
fprintf(
stderr,
"ERROR: power_scan(): "
"\"%s\" did not exit regularly (status=%d).\n",
command_up, status
);
return status;
}
else if (0 != WEXITSTATUS(status)) {
fprintf(
stderr, "ERROR: power_scan(): "
"\"%s\" did not exit successfully (status=%d).\n",
command_up, WEXITSTATUS(status)
);
return status;
}
if (scan == simple)
shell_reader = popen(
"/sbin/iwlist wlan0 scanning | "
"/bin/grep " SIMPLE_SCAN_OPT " ESSID",
"r"
);
else
shell_reader = popen("/sbin/iwlist wlan0 scanning",
//"/sbin/iwlist wlan0 scanning | "
//"/bin/grep " POWER_SCAN_OPT " ESSID",
"r"
);
if(!shell_reader) {
fprintf(
stderr,
"ERROR: power_scan(): "
"popen() failed (Error: %s)\n",
strerror(errno)
);
return -1;
}
while((scan_buffer = fgets(scan_buffer, 1024, shell_reader)))
printf("%s", scan_buffer);
err = pclose(shell_reader);
if(err) {
fprintf(
stderr,
"ERROR: power_scan(): "
"pclose(shell_reader) failed (Error: %s)\n",
strerror(errno)
);
return -1;
}
return 0;
}
int scan(void)
{
return power_scan(simple);
}
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