Commit | Line | Data |
---|---|---|
d5996a1f DC |
1 | #include <stdlib.h> |
2 | #include <stdio.h> | |
3 | #include <unistd.h> | |
4 | #include <krb5.h> | |
e73ae134 DC |
5 | #include <time.h> |
6 | #include <string.h> | |
7 | #include <signal.h> | |
8 | #include <sys/wait.h> | |
9 | ||
10 | #define STD_INTERVAL (3600 * 8) | |
11 | ||
12 | volatile int died = 0; | |
13 | pid_t child; | |
14 | int execmode = 0, failsafe = 0; | |
15 | int verbose = 0, quiet = 0; | |
16 | krb5_context context = NULL; | |
17 | krb5_ccache ccache = NULL; | |
18 | ||
19 | void cleanup_krb5(void) | |
20 | { | |
21 | if(ccache != NULL) | |
22 | krb5_cc_close(context, ccache); | |
23 | if(context != NULL) | |
24 | krb5_free_context(context); | |
25 | } | |
26 | ||
27 | void sighandler(int sig) | |
28 | { | |
29 | switch(sig) { | |
30 | case SIGCHLD: | |
31 | died = 1; | |
32 | break; | |
33 | } | |
34 | } | |
35 | ||
36 | void renew(void) | |
37 | { | |
38 | int ret; | |
39 | ||
40 | if(ccache == NULL) | |
41 | return; | |
42 | } | |
d5996a1f DC |
43 | |
44 | int main(int argc, char **argv) | |
45 | { | |
e73ae134 DC |
46 | char *p; |
47 | int c; | |
48 | time_t interval, last, now; | |
49 | pid_t wpid; | |
50 | int ret, status; | |
51 | ||
52 | interval = STD_INTERVAL; | |
53 | while((c = getopt(argc, argv, "+hi:vqf")) != -1) { | |
54 | switch(c) { | |
55 | case 'v': | |
56 | verbose++; | |
57 | break; | |
58 | case 'q': | |
59 | quiet = 1; | |
60 | break; | |
61 | case 'f': | |
62 | failsafe = 1; | |
63 | break; | |
64 | case 'i': | |
65 | p = optarg + strlen(optarg) - 1; | |
66 | if((*p >= 'a') || (*p <= 'z')) { | |
67 | if(*p == 'm') | |
68 | interval = 60; | |
69 | else if(*p == 'h') | |
70 | interval = 3600; | |
71 | else if(*p == 'd') | |
72 | interval = 86400; | |
73 | else | |
74 | interval = 1; | |
75 | *p = 0; | |
76 | } else { | |
77 | interval = 1; | |
78 | } | |
79 | interval *= atoi(optarg); | |
80 | break; | |
81 | case 'h': | |
82 | case '?': | |
83 | case ':': | |
84 | default: | |
85 | fprintf(stderr, "usage: krb5-agent [-hvqf] [-i interval] [program args...]\n"); | |
86 | exit((c == 'h')?0:1); | |
87 | } | |
88 | } | |
89 | ||
90 | atexit(cleanup_krb5); | |
91 | if((ret = krb5_init_context(&context)) != 0) { | |
92 | if(!quiet) | |
93 | fprintf(stderr, "could not initialize Kerberos context: %s\n", error_message(ret)); | |
94 | if(!failsafe) | |
95 | exit(1); | |
96 | } | |
97 | if(context != NULL) { | |
98 | if((ret = krb5_cc_default(context, &ccache)) != 0) { | |
99 | if(!quiet) | |
100 | fprintf(stderr, "could not initialize Kerberos context: %s\n", error_message(ret)); | |
101 | if(!failsafe) | |
102 | exit(1); | |
103 | } | |
104 | } | |
105 | ||
106 | if(optind < argc) { | |
107 | execmode = 1; | |
108 | signal(SIGCHLD, sighandler); | |
109 | if((child = fork()) < 0) { | |
110 | perror("fork"); | |
111 | exit(1); | |
112 | } | |
113 | if(child == 0) { | |
114 | char buf[80]; | |
115 | snprintf(buf, 80, "KRB5_AGENT_PID=%i", getpid()); | |
116 | putenv(buf); | |
117 | execvp(argv[optind], argv + optind); | |
118 | perror(argv[optind]); | |
119 | exit(255); | |
120 | } | |
121 | } | |
122 | now = last = time(NULL); | |
123 | while(1) { | |
124 | if(died) { | |
125 | wpid = waitpid(-1, &status, WNOHANG); | |
126 | if(wpid < 0) { | |
127 | perror("waitpid"); | |
128 | } else if(execmode && (wpid == child)) { | |
129 | /* Try to preserve exit status as best as we can... */ | |
130 | if(WIFEXITED(status)) { | |
131 | exit(WEXITSTATUS(status)); | |
132 | } else { | |
133 | signal(WTERMSIG(status), SIG_DFL); | |
134 | kill(getpid(), WTERMSIG(status)); | |
135 | exit(255); | |
136 | } | |
137 | } | |
138 | died = 0; | |
139 | } | |
140 | sleep((last + interval) - now); | |
141 | now = time(NULL); | |
142 | if(now >= last + interval) | |
143 | renew(); | |
144 | } | |
d5996a1f | 145 | } |
e73ae134 DC |
146 | |
147 | /* | |
148 | * Local Variables: | |
149 | * compile-command: "gcc -Wall -g -o krb5-agent krb5-agent.c -lkrb5" | |
150 | * End: | |
151 | */ |