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Procan: Try to identify controlling terminal

This commit is contained in:
Gerhard Rieger 2023-11-11 17:45:02 +01:00
parent cd5673dbd0
commit 27877ea777
7 changed files with 314 additions and 36 deletions

183
procan.c
View file

@ -16,38 +16,168 @@
#include "sched.h"
#include "filan.h"
#include <sys/resource.h>
#include <sys/resource.h> /* RLIMIT_CPU ... */
#include <dirent.h> /* opendir() readdir() closedir() */
#include "procan.h"
/* Search dir recursively for matching device file.
Returns 0 on success;
returns -1 when it failed to find the device file. */
int find_devpath(
char *dirname,
unsigned int major,
unsigned int minor,
char *devname)
{
DIR *dirp;
struct dirent *dirent;
char devpath[PATH_MAX];
int rc;
/* Pass 1: search dir flatly for this device entry */
dirp = opendir(dirname);
if (dirp == NULL) {
Warn2("failed to open dir \"%s\": %s", dirname, strerror(errno));
return -1;
}
while ((errno = 0) || (dirent = readdir(dirp))) {
struct stat statbuf;
#if HAVE_DIRENT_D_TYPE
if (dirent->d_type != DT_CHR && dirent->d_type != DT_UNKNOWN)
continue;
#endif
snprintf(devpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
if (Stat(devpath, &statbuf) < 0) {
Warn2("failed to stat entry \"%s\": %s", devpath, strerror(errno));
continue;
}
if ((statbuf.st_mode & S_IFMT) != S_IFCHR)
continue;
if ((statbuf.st_rdev >> 8) == major &&
(statbuf.st_rdev & 0xff) == minor) {
strcpy(devname, devpath);
return 0;
}
continue;
}
closedir(dirp);
if (errno != 0) {
Warn2("failed to read dir \"%s\": %s", dirname, strerror(errno));
snprintf(devname, PATH_MAX, "device %u, %u", major, minor);
}
/* Pass 2: search sub dirs */
dirp = opendir(dirname);
if (dirp == NULL) {
Warn2("failed to open dir \"%s\": %s", dirname, strerror(errno));
return -1;
}
while ((errno = 0) || (dirent = readdir(dirp))) {
char dirpath[PATH_MAX];
#if HAVE_DIRENT_D_TYPE
if (dirent->d_type != DT_DIR)
continue;
#else /* Solaris */
{
struct stat statbuf;
if (Stat(dirent->d_name, &statbuf) < 0)
continue;
if ((statbuf.st_mode & S_IFMT) != S_IFDIR)
continue;
}
#endif
if (!strcmp(dirent->d_name, ".") || !strcmp(dirent->d_name, ".."))
continue;
snprintf(dirpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
rc = find_devpath(dirpath, major, minor, devname);
if (rc == 0) {
return 0;
}
}
closedir(dirp);
if (dirent == NULL) {
return 1;
}
return 0;
}
/* Tries to determine the name of the controlling terminal.
Returns 0 on success, the name in cttyname;
returns 1 when only the device numbers are in cttyname;
returns -1 when it failed to determine ctty. */
static int controlling_term(
FILE *outfile)
{
char cttypath[PATH_MAX+1];
int rc;
{ /* On Linux this just gives "/dev/tty" */
char s[L_ctermid+1];
fprintf(outfile, "controlling terminal by ctermid(): \"%s\"\n", ctermid(s));
}
{ /* Check if there is a controlling terminal */
int fd;
if ((fd = Open("/dev/tty", O_NOCTTY, 0)) >= 0)
/* On Linux this just gives "/dev/tty" */
fprintf(outfile, "controlling terminal by /dev/tty, ttyname(): \"%s\"\n", Ttyname(fd));
else
fprintf(outfile, "controlling terminal by /dev/tty, ttyname(): (none)\n");
}
#if HAVE_PROC_DIR
do { /* Linux: derive ctty from info in /proc */
const char procpath[] = "/proc/self/stat";
FILE *procstat;
unsigned int dev;
int n = 0;
unsigned int maj, min;
/* Linux: get device ids from /proc */
if ((procstat = fopen(procpath, "r")) == NULL) {
Warn1("failed to open \"%s\" for process info", procpath);
rc = -1;
break;
}
n = fscanf(procstat, "%*s %*s %*s %*s %*s %*s %u", &dev);
if (n != 1) {
Warn1("failed to read ctty info from \"%s\"", procpath);
rc = -1;
break;
}
maj = (dev>>8)&0xff;
min = ((dev>>12)&0xfff00)|(dev&0xff);
rc = find_devpath("/dev" /* _PATH_DEV has trailing "/" */, maj, min, cttypath);
if (rc < 0) {
snprintf(cttypath, PATH_MAX, "device %u, %u", maj, min);
rc = 1;
break;
}
rc = 0;
} while (false);
#else /* !HAVE_PROC_DIR */
rc = -1;
#endif /* !HAVE_PROC_DIR */
if (rc >= 0)
fprintf(outfile, "controlling terminal by /proc/<pid>/: \"%s\"\n", cttypath);
else
fprintf(outfile, "controlling terminal by /proc/<pid>/: (none)\n");
return 0;
}
int procan(FILE *outfile) {
/*filan(0, outfile);*/
/* controlling terminal */
fprintf(outfile, "process id = "F_pid"\n", Getpid());
fprintf(outfile, "process parent id = "F_pid"\n", Getppid());
{
int fd;
if ((fd = Open("/dev/tty", O_NOCTTY, 0)) < 0) {
fprintf(outfile, "controlling terminal: -\n");
} else {
#if 1
fprintf(outfile, "controlling terminal: \"%s\"\n", Ttyname(fd));
#else
char procpath[PATH_MAX], devpath[PATH_MAX+1];
int devlen;
sprintf(procpath, "/proc/"F_pid"/fd/%d", Getpid(), 0 /*! fd*/);
if ((devlen = Readlink(procpath, devpath, sizeof(devpath))) < 0) {
;
} else {
devpath[devlen] = '\0';
fprintf(outfile, "controlling terminal: \"%s\"\n", devpath);
}
#endif
}
}
controlling_term(outfile);
fprintf(outfile, "process group id = "F_pid"\n", Getpgrp());
#if HAVE_GETSID
fprintf(outfile, "process session id = "F_pid"\n", Getsid(0));
@ -55,15 +185,6 @@ int procan(FILE *outfile) {
fprintf(outfile, "process group id if fg process / stdin = "F_pid"\n", Tcgetpgrp(0));
fprintf(outfile, "process group id if fg process / stdout = "F_pid"\n", Tcgetpgrp(1));
fprintf(outfile, "process group id if fg process / stderr = "F_pid"\n", Tcgetpgrp(2));
{
int fd;
if ((fd = Open("/dev/tty", O_RDWR, 0600)) >= 0) {
fprintf(outfile, "process has a controlling terminal\n");
Close(fd);
} else {
fprintf(outfile, "process does not have a controlling terminal\n");
}
}
/* process owner, groups */
fprintf(outfile, "user id = "F_uid"\n", Getuid());