1 #include <stdio.h>
2 #include <string.h>
3 #include <fcntl.h>
4 #include <unistd.h>
5 #include <malloc.h>
6 #include <errno.h>
7 #include <sys/types.h>
8 #include <sys/stat.h>
9 #include <unistd.h>
10
11 extern int init_module(void *, unsigned long, const char *);
12
read_file(const char * filename,ssize_t * _size)13 static void *read_file(const char *filename, ssize_t *_size)
14 {
15 int ret, fd;
16 struct stat sb;
17 ssize_t size;
18 void *buffer = NULL;
19
20 /* open the file */
21 fd = open(filename, O_RDONLY);
22 if (fd < 0)
23 return NULL;
24
25 /* find out how big it is */
26 if (fstat(fd, &sb) < 0)
27 goto bail;
28 size = sb.st_size;
29
30 /* allocate memory for it to be read into */
31 buffer = malloc(size);
32 if (!buffer)
33 goto bail;
34
35 /* slurp it into our buffer */
36 ret = read(fd, buffer, size);
37 if (ret != size)
38 goto bail;
39
40 /* let the caller know how big it is */
41 *_size = size;
42
43 bail:
44 close(fd);
45 return buffer;
46 }
47
48 #define min(x,y) ((x) < (y) ? (x) : (y))
insmod_main(int argc,char ** argv)49 int insmod_main(int argc, char **argv)
50 {
51 void *file;
52 ssize_t size = 0;
53 char opts[1024];
54 int ret;
55
56 /* make sure we've got an argument */
57 if (argc < 2) {
58 fprintf(stderr, "usage: insmod <module.o>\n");
59 return -1;
60 }
61
62 /* read the file into memory */
63 file = read_file(argv[1], &size);
64 if (!file) {
65 fprintf(stderr, "insmod: can't open '%s'\n", argv[1]);
66 return -1;
67 }
68
69 opts[0] = '\0';
70 if (argc > 2) {
71 int i, len;
72 char *end = opts + sizeof(opts) - 1;
73 char *ptr = opts;
74
75 for (i = 2; (i < argc) && (ptr < end); i++) {
76 len = min(strlen(argv[i]), end - ptr);
77 memcpy(ptr, argv[i], len);
78 ptr += len;
79 *ptr++ = ' ';
80 *ptr++ = '\0';
81 }
82 *(ptr - 1) = '\0';
83 }
84
85 /* pass it to the kernel */
86 ret = init_module(file, size, opts);
87 if (ret != 0) {
88 fprintf(stderr,
89 "insmod: init_module '%s' failed (%s)\n",
90 argv[1], strerror(errno));
91 }
92
93 /* free the file buffer */
94 free(file);
95
96 return ret;
97 }
98
99