LIRC libraries Linux Infrared Remote Control

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lirc-utils.c
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1/****************************************************************************
2 * lirc-utils.c *************************************************************
3 ****************************************************************************
4 */
5
12#include <grp.h>
13#include <pwd.h>
14#include <stdlib.h>
15#include <string.h>
16#include <sys/types.h>
17#include <unistd.h>
18
19#ifdef HAVE_CONFIG_H
20# include <config.h>
21#endif
22
23#include "lirc/lirc_log.h"
24#include "lirc-utils.h"
25
26 static const logchannel_t logchannel = LOG_LIB;
27
28 const char* drop_sudo_root(int (*set_some_uid)(uid_t))
29{
30 struct passwd* pw;
31 char* user;
32 GETGROUPS_T groups[32];
33 int group_cnt = sizeof(groups)/sizeof(gid_t);
34 char groupnames[256] = {0};
35 char buff[12];
36 int r;
37 int i;
38
39 if (getuid() != 0)
40 return "";
41 user = getenv("SUDO_USER");
42 if (user == NULL)
43 return "root";
44 pw = getpwnam(user);
45 if (pw == NULL) {
46 log_perror_err("Can't run getpwnam() for %s", user);
47 return "";
48 }
49 r = getgrouplist(user, pw->pw_gid, groups, &group_cnt);
50 if (r == -1) {
51 log_perror_warn("Cannot get supplementary groups");
52 return "";
53 }
54 r = setgroups(group_cnt, groups);
55 if (r == -1) {
56 log_perror_warn("Cannot set supplementary groups");
57 return "";
58 }
59 r = setgid(pw->pw_gid);
60 if (r == -1) {
61 log_perror_warn("Cannot set GID");
62 return "";
63 }
64 r = set_some_uid(pw->pw_uid);
65 if (r == -1) {
66 log_perror_warn("Cannot change UID to %d", pw->pw_uid);
67 return "";
68 }
69 setenv("HOME", pw->pw_dir, 1);
70 log_notice("Running as user %s", user);
71 for (i = 0; i < group_cnt; i += 1) {
72 snprintf(buff, 5, " %d", groups[i]);
73 strcat(groupnames, buff);
74 }
75 log_debug("Groups: [%d]:%s", pw->pw_gid, groupnames);
76
77 return pw->pw_name;
78}
79
80
81 void drop_root_cli(int (*set_some_uid)(uid_t))
82{
83 const char* new_user;
84
85 new_user = drop_sudo_root(set_some_uid);
86 if (strcmp("root", new_user) == 0)
87 puts("Warning: Running as root.");
88 else if (strlen(new_user) == 0)
89 puts("Warning: Cannot change uid.");
90 else
91 printf("Running as regular user %s\n", new_user);
92}
drop_root_cli
void drop_root_cli(int(*set_some_uid)(uid_t))
Default view part of drop_sudo_root.
Definition lirc-utils.c:81
drop_sudo_root
const char * drop_sudo_root(int(*set_some_uid)(uid_t))
Try to drop possible root privileges, returning new user or "" on error.
Definition lirc-utils.c:28
lirc-utils.h
Utilities.
log_notice
#define log_notice(fmt,...)
Log a notice message.
Definition lirc_log.h:119
log_debug
#define log_debug(fmt,...)
Log a debug message.
Definition lirc_log.h:124
log_perror_err
#define log_perror_err(fmt,...)
perror wrapper logging with level LIRC_ERROR.
Definition lirc_log.h:89
log_perror_warn
#define log_perror_warn(fmt,...)
perror wrapper logging with level LIRC_WARNING.
Definition lirc_log.h:94
logchannel_t
logchannel_t
Log channels used to filter messages.
Definition lirc_log.h:53