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| 2 |
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| 3 | /*******************************************************************************
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| 4 | * Header Files *
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| 5 | *******************************************************************************/
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| 6 | #include <string.h>
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| 7 | #include <locale.h>
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| 8 | #include "shinstance.h"
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| 9 | #include <Windows.h>
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| 10 |
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| 11 | /*******************************************************************************
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| 12 | * Defined Constants And Macros *
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| 13 | *******************************************************************************/
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| 14 | /** The stack size. This is also defined in shforkA-win.asm. */
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| 15 | #define SHFORK_STACK_SIZE (1*1024*1024)
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| 16 |
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| 17 |
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| 18 | /*******************************************************************************
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| 19 | * Global Variables *
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| 20 | *******************************************************************************/
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| 21 | static void *g_stack_base = 0;
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| 22 | static void *g_stack_limit = 0;
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| 23 |
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| 24 |
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| 25 | /*******************************************************************************
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| 26 | * Internal Functions *
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| 27 | *******************************************************************************/
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| 28 | static void *shfork_string_to_ptr(const char *str, const char *argv0, const char *what);
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| 29 |
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| 30 | /* in shforkA-win.asm: */
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| 31 | extern void shfork_resume(void *cur, void *base, void *limit);
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| 32 |
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| 33 | /* called by shforkA-win.asm: */
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| 34 | void *shfork_maybe_forked(int argc, char **argv, char **envp);
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| 35 | extern int shfork_body(shinstance *psh, void *stack_ptr);
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| 36 |
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| 37 |
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| 38 | /***
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| 39 | * Called by shforkA-win.asm to check whether we're a forked child
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| 40 | * process or not.
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| 41 | *
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| 42 | * In the former case we will resume execution at the fork resume
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| 43 | * point. In the latter we'll allocate a new stack of the forkable
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| 44 | * heap and return it to the caller so real_main() in main.c can be
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| 45 | * invoked on it.
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| 46 | *
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| 47 | * @returns Stack or not at all.
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| 48 | * @param argc Argument count.
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| 49 | * @param argv Argument vector.
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| 50 | * @param envp Environment vector.
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| 51 | */
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| 52 | void *shfork_maybe_forked(int argc, char **argv, char **envp)
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| 53 | {
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| 54 | void *stack_ptr;
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| 55 |
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| 56 | /*
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| 57 | * Are we actually forking?
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| 58 | */
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| 59 | if ( argc != 8
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| 60 | || strcmp(argv[1], "--!forked!--")
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| 61 | || strcmp(argv[2], "--stack-address")
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| 62 | || strcmp(argv[4], "--stack-base")
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| 63 | || strcmp(argv[6], "--stack-limit"))
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| 64 | {
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| 65 | char *stack;
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| 66 | shheap_init();
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| 67 | stack = (char *)sh_malloc(NULL, SHFORK_STACK_SIZE) + SHFORK_STACK_SIZE;
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| 68 | g_stack_base = stack + SHFORK_STACK_SIZE;
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| 69 | g_stack_limit = stack;
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| 70 | return stack;
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| 71 | }
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| 72 |
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| 73 | /*
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| 74 | * Do any init that needs to be done before resuming the
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| 75 | * fork() call.
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| 76 | */
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| 77 | setlocale(LC_ALL, "");
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| 78 |
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| 79 | /*
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| 80 | * Convert the stack addresses.
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| 81 | */
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| 82 | stack_ptr = shfork_string_to_ptr(argv[3], argv[0], "--stack-address");
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| 83 | g_stack_base = shfork_string_to_ptr(argv[5], argv[0], "--stack-base");
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| 84 | g_stack_limit = shfork_string_to_ptr(argv[7], argv[0], "--stack-limit");
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| 85 |
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| 86 | /*
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| 87 | * Switch stack and jump to the fork resume point.
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| 88 | */
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| 89 | shfork_resume(stack_ptr, g_stack_base, g_stack_limit);
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| 90 | /* (won't get here) */
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| 91 | return NULL;
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| 92 | }
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| 93 |
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| 94 | /***
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| 95 | * Converts a string into a pointer.
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| 96 | *
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| 97 | * @returns Pointer.
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| 98 | * @param argv0 The program name in case of error.
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| 99 | * @param str The string to convert.
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| 100 | */
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| 101 | static void *shfork_string_to_ptr(const char *str, const char *argv0, const char *what)
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| 102 | {
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| 103 | const char *start = str;
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| 104 | intptr_t ptr = 0;
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| 105 | if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
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| 106 | str += 2;
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| 107 | while (*str)
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| 108 | {
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| 109 | unsigned digit;
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| 110 | switch (*str)
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| 111 | {
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| 112 | case '0': digit = 0; break;
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| 113 | case '1': digit = 1; break;
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| 114 | case '2': digit = 2; break;
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| 115 | case '3': digit = 3; break;
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| 116 | case '4': digit = 4; break;
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| 117 | case '5': digit = 5; break;
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| 118 | case '6': digit = 6; break;
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| 119 | case '7': digit = 7; break;
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| 120 | case '8': digit = 8; break;
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| 121 | case '9': digit = 9; break;
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| 122 | case 'a': case 'A': digit = 0xa; break;
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| 123 | case 'b': case 'B': digit = 0xb; break;
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| 124 | case 'c': case 'C': digit = 0xc; break;
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| 125 | case 'd': case 'D': digit = 0xd; break;
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| 126 | case 'e': case 'E': digit = 0xe; break;
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| 127 | case 'f': case 'F': digit = 0xf; break;
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| 128 | default:
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| 129 | fprintf(stderr, "%s: fatal error: Invalid %s '%s'\n", argv0, what, start);
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| 130 | exit(2);
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| 131 | }
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| 132 | ptr <<= 4;
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| 133 | ptr |= digit;
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| 134 | str++;
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| 135 | }
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| 136 | return (void *)ptr;
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| 137 | }
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| 138 |
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| 139 | /***
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| 140 | * Create the child process making sure it inherits all our handles,
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| 141 | * copy of the forkable heap and kick it off.
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| 142 | *
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| 143 | * Called by shfork_do_it() in shforkA-win.asm.
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| 144 | *
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| 145 | * @returns child pid on success, -1 and errno on failure.
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| 146 | * @param psh The shell that's forking.
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| 147 | * @param stack_ptr The stack address at which the guest is suppost to resume.
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| 148 | */
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| 149 | int shfork_body(shinstance *psh, void *stack_ptr)
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| 150 | {
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| 151 | PROCESS_INFORMATION ProcInfo;
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| 152 | STARTUPINFO StrtInfo;
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| 153 | intptr_t hndls[3];
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| 154 | char szExeName[1024];
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| 155 | char szCmdLine[1024+256];
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| 156 | DWORD cch;
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| 157 | int rc = 0;
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| 158 |
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| 159 | /*
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| 160 | * Mark all handles inheritable and get the three standard handles.
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| 161 | */
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| 162 | shfile_fork_win(&psh->fdtab, 1 /* set */, &hndls[0]);
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| 163 |
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| 164 | /*
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| 165 | * Create the process.
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| 166 | */
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| 167 | cch = GetModuleFileName(GetModuleHandle(NULL), szExeName, sizeof(szExeName));
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| 168 | if (cch > 0)
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| 169 | {
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| 170 | #if 0 /* quoting the program name doesn't seems to be working :/ */
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| 171 | szCmdLine[0] = '"';
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| 172 | memcpy(&szCmdLine[1], szExeName, cch);
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| 173 | szCmdLine[++cch] = '"';
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| 174 | #else
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| 175 | memcpy(&szCmdLine[0], szExeName, cch);
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| 176 | #endif
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| 177 | cch += sprintf(&szCmdLine[cch], " --!forked!-- --stack-address %p --stack-base %p --stack-limit %p",
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| 178 | stack_ptr, g_stack_base, g_stack_limit);
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| 179 | szCmdLine[cch+1] = '\0';
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| 180 |
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| 181 | memset(&StrtInfo, '\0', sizeof(StrtInfo)); /* just in case. */
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| 182 | StrtInfo.cb = sizeof(StrtInfo);
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| 183 | StrtInfo.lpReserved = NULL;
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| 184 | StrtInfo.lpDesktop = NULL;
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| 185 | StrtInfo.lpTitle = NULL;
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| 186 | StrtInfo.dwX = 0;
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| 187 | StrtInfo.dwY = 0;
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| 188 | StrtInfo.dwXSize = 0;
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| 189 | StrtInfo.dwYSize = 0;
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| 190 | StrtInfo.dwXCountChars = 0;
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| 191 | StrtInfo.dwYCountChars = 0;
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| 192 | StrtInfo.dwFillAttribute = 0;
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| 193 | StrtInfo.dwFlags = STARTF_USESTDHANDLES;;
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| 194 | StrtInfo.wShowWindow = 0;
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| 195 | StrtInfo.cbReserved2 = 0;
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| 196 | StrtInfo.lpReserved2 = NULL;
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| 197 | StrtInfo.hStdInput = (HANDLE)hndls[0];
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| 198 | StrtInfo.hStdOutput = (HANDLE)hndls[1];
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| 199 | StrtInfo.hStdError = (HANDLE)hndls[2];
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| 200 | if (CreateProcess(szExeName,
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| 201 | szCmdLine,
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| 202 | NULL, /* pProcessAttributes */
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| 203 | NULL, /* pThreadAttributes */
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| 204 | TRUE, /* bInheritHandles */
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| 205 | CREATE_SUSPENDED,
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| 206 | NULL, /* pEnvironment */
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| 207 | NULL, /* pCurrentDirectory */
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| 208 | &StrtInfo,
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| 209 | &ProcInfo))
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| 210 | {
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| 211 | /*
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| 212 | * Copy the memory to the child.
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| 213 | */
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| 214 | rc = shheap_fork_copy_to_child(ProcInfo.hProcess);
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| 215 | if (!rc)
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| 216 | {
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| 217 | if (ResumeThread(ProcInfo.hThread) != (DWORD)-1)
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| 218 | {
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| 219 | rc = sh_add_child(psh, ProcInfo.dwProcessId, ProcInfo.hProcess);
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| 220 | if (!rc)
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| 221 | rc = (int)ProcInfo.dwProcessId;
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| 222 | }
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| 223 | else
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| 224 | {
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| 225 | DWORD dwErr = GetLastError();
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| 226 | fprintf(stderr, "shfork: ResumeThread() -> %d\n", dwErr);
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| 227 | errno = EINVAL;
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| 228 | rc = -1;
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| 229 | }
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| 230 | }
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| 231 | if (rc == -1)
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| 232 | {
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| 233 | TerminateProcess(ProcInfo.hProcess, 127);
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| 234 | /* needed?: ResumeThread(ProcInfo.hThread); */
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| 235 | CloseHandle(ProcInfo.hProcess);
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| 236 | }
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| 237 | CloseHandle(ProcInfo.hThread);
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| 238 | }
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| 239 | else
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| 240 | {
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| 241 | DWORD dwErr = GetLastError();
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| 242 | fprintf(stderr, "shfork: CreateProcess(%s) -> %d\n", szExeName, dwErr);
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| 243 | errno = EINVAL;
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| 244 | rc = -1;
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| 245 | }
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| 246 | }
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| 247 | else
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| 248 | {
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| 249 | DWORD dwErr = GetLastError();
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| 250 | fprintf(stderr, "shfork: GetModuleFileName() -> %d\n", dwErr);
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| 251 | errno = EINVAL;
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| 252 | rc = -1;
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| 253 | }
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| 254 |
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| 255 | /*
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| 256 | * Restore the handle inherit property.
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| 257 | */
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| 258 | shfile_fork_win(&psh->fdtab, 0 /* restore */, NULL);
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| 259 |
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| 260 | return rc;
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| 261 | }
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