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- Committer: Teddy Hogeborn
- Date: 2009-10-26 21:16:16 UTC
- Revision ID: teddy@fukt.bsnet.se-20091026211616-38e9wynf4428ip2l
Merge from release branch.
added
removed
plugin-runner.c
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
55
FD_CLOEXEC */
56
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
57
strsignal() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
75
72
76
73
#define BUFFER_SIZE 256
77
74
268
265
/* No child processes */
269
266
break;
270
267
}
271
error(0, errno, "waitpid");
268
perror("waitpid");
272
269
}
273
270
274
271
/* A child exited, find it in process_list */
359
356
sigemptyset(&sigchld_action.sa_mask);
360
357
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
358
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
364
361
goto fallback;
365
362
}
366
363
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
364
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
370
367
goto fallback;
371
368
}
372
369
601
598
case ENOMEM:
602
599
default:
603
600
errno = ret;
604
error(0, errno, "argp_parse");
601
perror("argp_parse");
605
602
exitstatus = EX_OSERR;
606
603
goto fallback;
607
604
case EINVAL:
628
625
custom_argc = 1;
629
626
custom_argv = malloc(sizeof(char*) * 2);
630
627
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
633
630
goto fallback;
634
631
}
635
632
custom_argv[0] = argv[0];
651
648
}
652
649
new_arg = strdup(p);
653
650
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
656
653
free(org_line);
657
654
goto fallback;
658
655
}
661
658
custom_argv = realloc(custom_argv, sizeof(char *)
662
659
* ((unsigned int) custom_argc + 1));
663
660
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
666
663
free(org_line);
667
664
goto fallback;
668
665
}
674
671
ret = fclose(conffp);
675
672
} while(ret == EOF and errno == EINTR);
676
673
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
679
676
goto fallback;
680
677
}
681
678
free(org_line);
683
680
/* Check for harmful errors and go to fallback. Other errors might
684
681
not affect opening plugins */
685
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
688
685
goto fallback;
689
686
}
690
687
}
700
697
case ENOMEM:
701
698
default:
702
699
errno = ret;
703
error(0, errno, "argp_parse");
700
perror("argp_parse");
704
701
exitstatus = EX_OSERR;
705
702
goto fallback;
706
703
case EINVAL:
720
717
case ENOMEM:
721
718
default:
722
719
errno = ret;
723
error(0, errno, "argp_parse");
720
perror("argp_parse");
724
721
exitstatus = EX_OSERR;
725
722
goto fallback;
726
723
case EINVAL:
745
742
/* Strip permissions down to nobody */
746
743
setgid(gid);
747
744
if(ret == -1){
748
error(0, errno, "setgid");
745
perror("setgid");
749
746
}
750
747
ret = setuid(uid);
751
748
if(ret == -1){
752
error(0, errno, "setuid");
749
perror("setuid");
753
750
}
754
751
755
752
/* Open plugin directory with close_on_exec flag */
773
770
);
774
771
}
775
772
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
778
775
goto fallback;
779
776
}
780
777
782
779
/* Set the FD_CLOEXEC flag on the directory */
783
780
ret = set_cloexec_flag(dir_fd);
784
781
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
782
perror("set_cloexec_flag");
786
783
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
784
exitstatus = EXIT_FAILURE;
788
785
goto fallback;
789
786
}
790
787
#endif /* O_CLOEXEC */
791
788
792
789
dir = fdopendir(dir_fd);
793
790
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
791
perror("Could not open plugin dir");
795
792
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
793
exitstatus = EXIT_FAILURE;
797
794
goto fallback;
798
795
}
799
796
}
809
806
/* All directory entries have been processed */
810
807
if(dirst == NULL){
811
808
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
814
811
goto fallback;
815
812
}
816
813
break;
846
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
844
size_t suf_len = strlen(*suf);
848
845
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
847
== 0)){
851
848
if(debug){
852
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
872
869
dirst->d_name));
873
870
}
874
871
if(ret < 0){
875
error(0, errno, "asprintf");
872
perror("asprintf");
876
873
continue;
877
874
}
878
875
879
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
877
if(ret == -1){
881
error(0, errno, "stat");
878
perror("stat");
882
879
free(filename);
883
880
continue;
884
881
}
896
893
897
894
plugin *p = getplugin(dirst->d_name);
898
895
if(p == NULL){
899
error(0, errno, "getplugin");
896
perror("getplugin");
900
897
free(filename);
901
898
continue;
902
899
}
914
911
if(g != NULL){
915
912
for(char **a = g->argv + 1; *a != NULL; a++){
916
913
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
914
perror("add_argument");
918
915
}
919
916
}
920
917
/* Add global environment variables */
921
918
for(char **e = g->environ; *e != NULL; e++){
922
919
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
920
perror("add_environment");
924
921
}
925
922
}
926
923
}
931
928
if(p->environ[0] != NULL){
932
929
for(char **e = environ; *e != NULL; e++){
933
930
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
931
perror("add_environment");
935
932
}
936
933
}
937
934
}
939
936
int pipefd[2];
940
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
938
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
944
941
goto fallback;
945
942
}
946
943
/* Ask OS to automatic close the pipe on exec */
947
944
ret = set_cloexec_flag(pipefd[0]);
948
945
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
951
948
goto fallback;
952
949
}
953
950
ret = set_cloexec_flag(pipefd[1]);
954
951
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
957
954
goto fallback;
958
955
}
959
956
/* Block SIGCHLD until process is safely in process list */
961
958
&sigchld_action.sa_mask,
962
959
NULL));
963
960
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
966
963
goto fallback;
967
964
}
968
965
/* Starting a new process to be watched */
971
968
pid = fork();
972
969
} while(pid == -1 and errno == EINTR);
973
970
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
976
973
goto fallback;
977
974
}
978
975
if(pid == 0){
979
976
/* this is the child process */
980
977
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
978
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
984
981
}
985
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
983
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
989
986
}
990
987
991
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
989
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
990
perror("dup2");
991
_exit(EXIT_FAILURE);
995
992
}
996
993
997
994
if(dirfd(dir) < 0){
1001
998
}
1002
999
if(p->environ[0] == NULL){
1003
1000
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1006
1003
}
1007
1004
} else {
1008
1005
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1011
1008
}
1012
1009
}
1013
1010
/* no return */
1018
1015
free(filename);
1019
1016
plugin *new_plugin = getplugin(dirst->d_name);
1020
1017
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1018
perror("getplugin");
1022
1019
ret = (int)(TEMP_FAILURE_RETRY
1023
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
1021
NULL)));
1025
1022
if(ret < 0){
1026
error(0, errno, "sigprocmask");
1023
perror("sigprocmask");
1027
1024
}
1028
exitstatus = EX_OSERR;
1025
exitstatus = EXIT_FAILURE;
1029
1026
goto fallback;
1030
1027
}
1031
1028
1038
1035
&sigchld_action.sa_mask,
1039
1036
NULL));
1040
1037
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1043
1040
goto fallback;
1044
1041
}
1045
1042
1071
1068
fd_set rfds = rfds_all;
1072
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1073
1070
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1076
1073
goto fallback;
1077
1074
}
1078
1075
/* OK, now either a process completed, or something can be read
1113
1110
&sigchld_action.sa_mask,
1114
1111
NULL));
1115
1112
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1118
1115
goto fallback;
1119
1116
}
1120
1117
1127
1124
(sigprocmask(SIG_UNBLOCK,
1128
1125
&sigchld_action.sa_mask, NULL)));
1129
1126
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1132
1129
goto fallback;
1133
1130
}
1134
1131
1144
1141
bool bret = print_out_password(proc->buffer,
1145
1142
proc->buffer_length);
1146
1143
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1149
1146
}
1150
1147
goto fallback;
1151
1148
}
1163
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
1161
+ (size_t) BUFFER_SIZE);
1165
1162
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1168
1165
goto fallback;
1169
1166
}
1170
1167
proc->buffer_size += BUFFER_SIZE;
1191
1188
1192
1189
fallback:
1193
1190
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1196
1192
/* Fallback if all plugins failed, none are found or an error
1197
1193
occured */
1198
1194
bool bret;
1206
1202
}
1207
1203
bret = print_out_password(passwordbuffer, len);
1208
1204
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1211
1207
}
1212
1208
}
1213
1209
1214
1210
/* Restore old signal handler */
1215
1211
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
1212
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1219
1215
}
1220
1216
1221
1217
if(custom_argv != NULL){
1236
1232
ret = kill(p->pid, SIGTERM);
1237
1233
if(ret == -1 and errno != ESRCH){
1238
1234
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1235
perror("kill");
1240
1236
}
1241
1237
}
1242
1238
}
1246
1242
ret = wait(NULL);
1247
1243
} while(ret >= 0);
1248
1244
if(errno != ECHILD){
1249
error(0, errno, "wait");
1245
perror("wait");
1250
1246
}
1251
1247
1252
1248
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0