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proc_parse: Routine for reading creds from /proc/pid/status

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All the IDs and caps are in there. Just read them for future use.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Pavel Emelyanov
2012-01-27 21:37:13 +04:00
committed by Cyrill Gorcunov
parent 47c161f2dc
commit f382d2a376
2 changed files with 109 additions and 0 deletions
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13
include/proc_parse.h
View File

@@ -59,7 +59,20 @@ struct proc_pid_stat {
int exit_code;
};
#define PROC_CAP_SIZE 2
struct proc_status_creds {
unsigned int uids[4];
unsigned int gids[4];
unsigned int cap_inh[PROC_CAP_SIZE];
unsigned int cap_prm[PROC_CAP_SIZE];
unsigned int cap_eff[PROC_CAP_SIZE];
unsigned int cap_bnd[PROC_CAP_SIZE];
};
extern int parse_pid_stat(pid_t pid, int pid_dir, struct proc_pid_stat *s);
extern int parse_maps(pid_t pid, int pid_dir, struct list_head *vma_area_list, bool use_map_files);
extern int parse_pid_status(int pid_dir, struct proc_status_creds *);
#endif /* PROC_PARSE_H__ */

96
proc_parse.c
View File

@@ -6,6 +6,7 @@
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include <string.h>
#include "types.h"
#include "list.h"
@@ -258,3 +259,98 @@ int parse_pid_stat(pid_t pid, int pid_dir, struct proc_pid_stat *s)
return 0;
}
static int ids_parse(char *str, unsigned int *arr)
{
char *end;
arr[0] = strtol(str, &end, 10);
arr[1] = strtol(end + 1, &end, 10);
arr[2] = strtol(end + 1, &end, 10);
arr[3] = strtol(end + 1, &end, 10);
if (*end != '\n')
return -1;
else
return 0;
}
static int cap_parse(char *str, unsigned int *res)
{
int i, ret;
for (i = 0; i < PROC_CAP_SIZE; i++) {
ret = sscanf(str, "%08x", &res[PROC_CAP_SIZE - 1 - i]);
if (ret != 1)
return -1;
str += 8;
}
return 0;
}
int parse_pid_status(int pid_dir, struct proc_status_creds *cr)
{
int done = 0;
FILE *f;
char str[64];
f = fopen_proc(pid_dir, "status");
if (f == NULL) {
pr_perror("Can't open proc status\n");
return -1;
}
while (done < 6 && fgets(str, sizeof(str), f)) {
if (!strncmp(str, "Uid:", 4)) {
if (ids_parse(str + 5, cr->uids))
goto err_parse;
done++;
}
if (!strncmp(str, "Gid:", 4)) {
if (ids_parse(str + 5, cr->gids))
goto err_parse;
done++;
}
if (!strncmp(str, "CapInh:", 7)) {
if (cap_parse(str + 8, cr->cap_inh))
goto err_parse;
done++;
}
if (!strncmp(str, "CapEff:", 7)) {
if (cap_parse(str + 8, cr->cap_eff))
goto err_parse;
done++;
}
if (!strncmp(str, "CapPrm:", 7)) {
if (cap_parse(str + 8, cr->cap_prm))
goto err_parse;
done++;
}
if (!strncmp(str, "CapBnd:", 7)) {
if (cap_parse(str + 8, cr->cap_bnd))
goto err_parse;
done++;
}
}
if (done != 6) {
err_parse:
pr_err("Error parsing proc status file\n");
fclose(f);
return -1;
}
fclose(f);
return 0;
}