CodeCow/PCAPdroid
1
0
Fork 0
mirror of https://github.com/emanuele-f/PCAPdroid.git synced 2026-06-16 21:10:57 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

Improve pcapd error reporting

Browse Source 
This makes it possible to get pcapd errors which occur before the
logfile is open.
This commit is contained in:
emanuele-f 2021-09-01 14:37:59 +02:00
parent 997113b0ee
commit 241a39ae91
1 changed files with 70 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
app/src/main/jni/vpnproxy-jni/capture_root.c
View File

@ -19,6 +19,8 @@
#include <sys/un.h>
#include <linux/limits.h>
#include <sys/wait.h>
#include <paths.h>
#include "vpnproxy.h"
#include "pcapd/pcapd.h"
#include "common/utils.h"
@ -41,19 +43,76 @@ typedef struct {
/* ******************************************************* */
static int su_cmd(const char *prog, const char *args) {
FILE *fp;
int in_p[2], out_p[2];
int rv = -1;
pid_t pid;
if((fp = popen("su", "w")) == NULL) {
log_e("popen(\"su\") failed[%d]: %s", errno, strerror(errno));
pclose(fp);
return -1;
if((pipe(in_p) != 0) || (pipe(out_p) != 0)) {
log_f("pipe failed[%d]: %s", errno, strerror(errno));
return -1;
}
log_d("su_cmd: %s %s", prog, args);
fprintf(fp, "%s", prog);
fprintf(fp, " %s\n", args);
if((pid = fork()) == 0) {
// child
char *argp[] = {"sh", "-c", "su", NULL};
return pclose(fp);
close(in_p[1]);
close(out_p[0]);
dup2(in_p[0], STDIN_FILENO);
dup2(out_p[1], STDOUT_FILENO);
dup2(out_p[1], STDERR_FILENO);
execve(_PATH_BSHELL, argp, environ);
fprintf(stderr, "execve failed[%d]: %s", errno, strerror(errno));
exit(1);
} else if(pid > 0) {
// parent
int out = out_p[0];
close(in_p[0]);
close(out_p[1]);
// write "su" command input
log_d("su_cmd: %s %s", prog, args);
write(in_p[1], prog, strlen(prog));
write(in_p[1], " ", 1);
write(in_p[1], args, strlen(args));
write(in_p[1], "\n", 1);
close(in_p[1]);
waitpid(pid, &rv, 0);
if(rv != 0) {
char buf[128];
struct timeval timeout = {0};
fd_set fds;
buf[0] = '\0';
FD_ZERO(&fds);
FD_SET(out, &fds);
select(out + 1, &fds, NULL, NULL, &timeout);
if (FD_ISSET(out, &fds)) {
int num = read(out, buf, sizeof(buf) - 1);
if (num > 0)
buf[num] = '\0';
}
log_f("su \"%s\" invocation failed: %s", prog, buf);
rv = -1;
}
close(out_p[0]);
} else {
log_f("fork() failed[%d]: %s", errno, strerror(errno));
close(in_p[0]);
close(in_p[1]);
close(out_p[0]);
close(out_p[1]);
return -1;
}
return rv;
}
/* ******************************************************* */
@ -160,7 +219,8 @@ static int connectPcapd(vpnproxy_data_t *proxy) {
// Start the daemon
char args[256];
snprintf(args, sizeof(args), "-l pcapd.log -i %s -d -u %d -b \"%s\"", capture_interface, proxy->app_filter, bpf);
su_cmd(pcapd, args);
if(su_cmd(pcapd, args) != 0)
goto cleanup;
// Wait for pcapd to start
struct timeval timeout = {.tv_sec = 1, .tv_usec = 0};