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meillo@0
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1 /* This a snippet I found in sourceforge. I just changed the identing
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meillo@29
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2 style to my own and deleted the main function. -- oku
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meillo@29
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3 The functions destroy_argv() and create_argv() were added by oku.
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meillo@29
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4 */
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meillo@0
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5
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meillo@0
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6 #include <errno.h>
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meillo@0
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7 #include <stdio.h>
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meillo@0
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8 #include <stdlib.h>
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meillo@0
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9 #include <unistd.h>
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meillo@0
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10 #include <string.h>
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meillo@0
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11 #include <sys/types.h>
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meillo@15
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12 #include <sysexits.h>
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meillo@0
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13
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meillo@0
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14 #include "peopen.h"
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meillo@0
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15 #include "masqmail.h"
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meillo@0
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16
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meillo@10
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17 static void
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meillo@10
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18 destroy_argv(char **arr)
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meillo@0
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19 {
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meillo@10
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20 char *p = arr[0];
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meillo@10
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21 int i = 0;
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meillo@0
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22
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meillo@10
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23 while (p) {
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meillo@10
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24 free(p);
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meillo@10
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25 p = arr[i++];
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meillo@10
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26 }
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meillo@10
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27 free(arr);
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meillo@0
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28 }
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meillo@0
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29
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meillo@10
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30 static char**
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meillo@10
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31 create_argv(const char *cmd, int count)
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meillo@0
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32 {
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meillo@10
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33 char buf[strlen(cmd) + 1];
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meillo@10
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34 char **arr, *q;
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meillo@10
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35 const char *p;
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meillo@10
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36 int i = 0;
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meillo@0
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37
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meillo@27
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38 arr = (char **) g_malloc(sizeof(char *) * count);
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meillo@0
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39
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meillo@10
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40 p = cmd;
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meillo@10
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41 while (*p && i < (count - 1)) {
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meillo@10
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42 while (*p && isspace(*p))
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meillo@10
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43 p++;
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meillo@10
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44 q = buf;
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meillo@10
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45 while (*p && !isspace(*p))
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meillo@10
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46 *q++ = *p++;
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meillo@15
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47 *q = '\0';
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meillo@10
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48 arr[i++] = strdup(buf);
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meillo@10
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49 while (*p && isspace(*p))
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meillo@10
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50 p++;
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meillo@10
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51 }
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meillo@10
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52 arr[i] = NULL;
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meillo@10
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53
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meillo@10
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54 return arr;
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meillo@0
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55 }
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meillo@0
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56
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meillo@10
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57 FILE*
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meillo@10
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58 peidopen(const char *command, const char *type, char *const envp[], int *ret_pid, uid_t uid, gid_t gid)
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meillo@0
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59 {
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meillo@10
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60 enum { Read, Write } mode;
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meillo@10
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61 int pipe_fd[2];
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meillo@10
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62 pid_t pid;
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meillo@0
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63
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meillo@10
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64 if (command == NULL || type == NULL) {
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meillo@10
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65 errno = EINVAL;
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meillo@10
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66 return NULL;
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meillo@10
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67 }
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meillo@0
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68
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meillo@10
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69 if (strcmp(type, "r")) {
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meillo@10
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70 if (strcmp(type, "w")) {
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meillo@10
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71 errno = EINVAL;
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meillo@10
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72 return NULL;
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meillo@10
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73 } else
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meillo@10
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74 mode = Write;
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meillo@10
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75 } else
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meillo@10
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76 mode = Read;
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meillo@0
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77
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meillo@10
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78 if (pipe(pipe_fd) == -1)
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meillo@10
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79 return NULL;
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meillo@0
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80
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meillo@10
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81 switch (pid = fork()) {
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meillo@10
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82 case 0: /* child thread */
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meillo@0
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83
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meillo@10
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84 {
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meillo@10
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85 int i, max_fd = sysconf(_SC_OPEN_MAX);
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meillo@10
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86
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meillo@10
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87 if (max_fd <= 0)
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meillo@10
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88 max_fd = 64;
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meillo@10
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89 for (i = 0; i < max_fd; i++)
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meillo@10
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90 if ((i != pipe_fd[0]) && (i != pipe_fd[1]))
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meillo@10
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91 close(i);
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meillo@10
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92 }
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meillo@10
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93 if (close(pipe_fd[mode == Read ? 0 : 1]) != -1 &&
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meillo@10
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94 dup2(pipe_fd[mode == Read ? 1 : 0],
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meillo@10
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95 mode == Read ? STDOUT_FILENO : STDIN_FILENO) != -1) {
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meillo@207
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96 /* char *argv [] = { "/bin/sh", "-c", (char*) command, NULL }; */
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meillo@10
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97 char **argv = create_argv(command, 10);
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meillo@10
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98 int ret;
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meillo@10
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99
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meillo@10
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100 if (uid != (uid_t) - 1) {
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meillo@10
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101 if ((ret = seteuid(0)) != 0) {
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meillo@10
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102 exit(EX_NOPERM);
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meillo@10
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103 }
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meillo@10
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104 }
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meillo@10
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105 if (gid != (gid_t) - 1) {
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meillo@10
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106 if ((ret = setgid(gid)) != 0) {
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meillo@10
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107 exit(EX_NOPERM);
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meillo@10
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108 }
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meillo@10
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109 }
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meillo@10
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110 if (uid != (uid_t) - 1) {
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meillo@10
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111 if ((ret = setuid(uid)) != 0) {
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meillo@10
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112 exit(EX_NOPERM);
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meillo@10
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113 }
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meillo@10
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114 }
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meillo@10
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115 execve(*argv, argv, envp);
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meillo@10
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116 }
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meillo@10
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117
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meillo@10
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118 _exit(errno);
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meillo@10
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119
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meillo@10
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120 default: /* parent thread */
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meillo@10
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121 *ret_pid = pid;
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meillo@10
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122 close(pipe_fd[mode == Read ? 1 : 0]);
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meillo@10
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123 return fdopen(pipe_fd[mode == Read ? 0 : 1], type);
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meillo@10
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124
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meillo@10
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125 case -1:
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meillo@10
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126 close(pipe_fd[0]);
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meillo@10
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127 close(pipe_fd[1]);
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meillo@10
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128 return NULL;
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meillo@0
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129 }
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meillo@0
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130 }
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meillo@0
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131
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meillo@10
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132 FILE*
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meillo@10
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133 peopen(const char *command, const char *type, char *const envp[], int *ret_pid)
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meillo@0
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134 {
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meillo@10
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135 return peidopen(command, type, envp, ret_pid, -1, -1);
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meillo@0
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136 }
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