本文主要向大家介绍了C/C++知识点之C/C++知识点之ios遍历模块的方式，通过具体的内容向大家展示，希望对大家学习C/C++知识点有所帮助。

方式一：
通过mach_vm_region系统API

#include <mach/vm_map.h>#include <stdio.h>#include <mach-o/dyld_images.h>/**
 * vmmap(1) clone for OS X and iOS
 * -------------------------------
 *
 * This is a simple example of using the mach_vm_region_info APIs in order to 
 * obtain a process' (technically, a task's) virtual memory address space, in a
 * manner akin to /proc/[pid]/maps on Linux.
 *
 * The process is simple - get the task port, then call mach_vm_region_info until
 * you've exhausted the address space (in iOS this happens around 0x40000000, 
 * where the commpage is). On iOS 6, for some peculiar reason the task port is
 * invalidated after each call, so the quick workaround here solves the problem
 * by regetting the port. The actual mach error code to check for is in the header
 * files, though the code simply tries regetting.
 *
 * N.B - For this code to work, you MUST provide the entitlements to allow 
 * task-for-pid to work, else you'll fail with error 5. The entitlements are in 
 * the output in Chapter 3, but for those of you who haven't bought the book, it would be:
 *
--- Cut here 

<!DOCTYPE plist PUBLIC ""-//Apple//DTD PLIST 1.0//EN"" ""//www.apple.com/DTDs/PropertyList-1.0.dtd"">
<plist version=""1.0"">
<dict>
        <key>com.apple.springboard.debugapplications</key>
        <true/>
        <key>get-task-allow</key>
        <true/>
        <key>proc_info-allow</key>
        <true/>
        <key>task_for_pid-allow</key>
        <true/>
        <key>run-unsigned-code</key>
        <true/>
</dict>
</plist>

--- Ok, enough :-)
 *
 *  so - copy the above XML to a file, say, ""ent.xml"", and be sure to run ""ldid -Sent.xml vmmap""
 *  before trying to run this. You can download the binary (already thus signed) if you're lazy
 *  (and trust me, because you *will* need root on your i-Device for this)
 *
 *  As the book clearly states, once you have the task port, the world is your oyster. You can
 *  control the entire virtual memory space, reading and writing it as you please. Stay tuned
 *  for the corrupt tool (which will be provided soon in binary form)
 *
 */int g_pid = 0; // required in iOS 6 (read below) /* 03/08/13 - Added List of Mach-O images: */struct dyld_image_info *g_dii = NULL;int     g_imageCount;//读取进程内存数据unsigned char *readProcessMemory (int pid, mach_vm_address_t addr, mach_msg_type_number_t *size){    // Helper function to read process memory (a la Win32 API of same name)    // To make it easier for inclusion elsewhere, it takes a pid, and    // does the task_for_pid by itself. Given that iOS invalidates task ports    // after use, it's actually a good idea, since we'd need to reget anyway    task_t  t;    //获取进程中的任务
    task_for_pid(mach_task_self(),pid, &t);        mach_msg_type_number_t  dataCnt = size;        vm_offset_t readMem;    // Use vm_read, rather than mach_vm_read, since the latter is different    // in iOS.        //获取内存        kern_return_t kr = vm_read(t,        // vm_map_t target_task,  任务
                     addr,     // mach_vm_address_t address, 任务中对应地址
                     *size,     // mach_vm_size_t size
                     &readMem,     //vm_offset_t *data,
                     size);     // mach_msg_type_number_t *dataCnt        if (kr) {                // DANG..                fprintf (stderr, ""Unable to read target task's memory @%p - kr 0x%x\n"" , addr, kr);                 return NULL;
                }    return ( (unsigned char *) readMem);

}kern_return_t mach_vm_read (vm_map_t, mach_vm_address_t, mach_vm_size_t, vm_offset_t *, mach_msg_type_number_t *);//暴利搜索内存void findListOfBinaries(task_t  t, mach_vm_address_t    addr, int size){        kern_return_t kr;        mach_msg_type_number_t  dataCnt = size;        // 读取指定内存地址上指定大小的内容        unsigned char *readData = readProcessMemory (g_pid, addr, &dataCnt);        int machsig = 0xfeedface;    // Checking only 0xfeedfa is a simple way to catch both 64-bit (facf) and 32-bit (face) headers        // Machine endianness is automatically taken care of, too..    // 判断是否是macho头    if (readData && memcmp (readData + 1, ((unsigned char *) &machsig) + 1 , 3) == 0)
    {        // This is a Mach header        int i = 0;        // A MUCH better way would be to iterate through the LC and find the name of dyld        // but this would require my machlib.c (closed source) and really get the same result.        // This works because on both iOS and OS X dyld is at /usr/lib.        for (i = 0; i <dataCnt; i++)
        {   
            // 循环比较内存内容是否是""lib/dyld""            if (memcmp(readData+i, ""lib/dyld"", 8) == 0)
            {                unsigned int dyld_all_image_infos_offset ;                int imageCount = 0;                // 拷贝导入模块信息                memcpy (&dyld_all_image_infos_offset, readData+DYLD_ALL_IMAGE_INFOS_OFFSET_OFFSET, sizeof (unsigned int));                 struct dyld_all_image_infos *dyldaii ;                 // Safeguard: should check that dyld_all_image_infos_offset is < size..                if (dyld_all_image_infos_offset > size)
                {                    // This is to be expected, since the dyld_all_image_infos is in a data region                    //printf (""Offset %x is greater than region size : %x\n"", dyld_all_image_infos_offset, size);
                    dataCnt = sizeof(dyld_all_image_infos);
                    readData = readProcessMemory (g_pid, addr + dyld_all_image_infos_offset , &dataCnt);                    if (!readData) { return;}
                    dyldaii = (struct dyld_all_image_infos *) readData;
                }                else
                {
                    dyldaii = (struct dyld_all_image_infos *) (readData +dyld_all_image_infos_offset);
                }                printf (""Version: %d, %d images at offset %p\n"",
                        dyldaii->version, dyldaii->infoArrayCount, dyldaii->infoArray);                // Go to dyldaii->infoArray address

                imageCount = dyldaii->infoArrayCount;                // 保存导入模块信息
                dataCnt = imageCount * sizeof(struct dyld_image_info);
                g_dii = (struct dyld_image_info *) malloc (dataCnt);
                g_imageCount = imageCount;
                readData = readProcessMemory(g_pid, dyldaii->infoArray, &dataCnt);                if (!readData) { return;}                struct dyld_image_info *dii = (struct dyld_image_info *) readData;                // We don't need i anymore, anyway                for (i = 0; i < imageCount; i++)
                    {
                        dataCnt = 1024;                        char *imageName = readProcessMemory (g_pid, dii[i].imageFilePath, &dataCnt);                        if (imageName) g_dii[i].imageFilePath = strdup(imageName);                        else g_dii[i].imageFilePath = NULL;
                        g_dii[i].imageLoadAddress = dii[i].imageLoadAddress;
                    }                break;
            }

        }
    }

} /* End 03/08/13 */char *behavior_to_text (vm_behavior_t b){  switch (b)
    {        case VM_BEHAVIOR_DEFAULT: return(""default"");        case VM_BEHAVIOR_RANDOM:  return(""random"");        case VM_BEHAVIOR_SEQUENTIAL: return(""fwd-seq"");        case VM_BEHAVIOR_RSEQNTL: return(""rev-seq"");        case VM_BEHAVIOR_WILLNEED: return(""will-need"");        case VM_BEHAVIOR_DONTNEED: return(""will-need"");        case VM_BEHAVIOR_FREE: return(""free-nowb"");        case VM_BEHAVIOR_ZERO_WIRED_PAGES: return(""zero-wire"");        case VM_BEHAVIOR_REUSABLE: return(""reusable"");        case VM_BEHAVIOR_REUSE: return(""reuse"");        case VM_BEHAVIOR_CAN_REUSE: return(""canreuse"");        default: return (""?"");
    }

}//内存属性char *protection_bits_to_rwx (vm_prot_t p){  // previous version of this somehow lost the ""p&"", always returning rwx..  static char returned[4];

  returned[0] = (p &VM_PROT_READ    ? 'r' : '-');
  returned[1] = (p &VM_PROT_WRITE   ? 'w' : '-');
  returned[2] = (p & VM_PROT_EXECUTE ? 'x' : '-');
  returned[3] = '\0'; // memory leak here. No biggy  return (strdup(returned));

}//当前内存状态const char *unparse_inheritance (vm_inherit_t i){  switch (i)
    {    case VM_INHERIT_SHARE:      return ""share"";    case VM_INHERIT_COPY:      return ""copy"";    case VM_INHERIT_NONE:      return ""none"";    default:      return ""???"";
    }
}

macosx_debug_regions (task_t task, mach_vm_address_t address, int max)
{  kern_return_t kret;  mach_vm_address_t prev_address;  /* @TODO: warning - potential overflow here - gotta fix this.. */  vm_region_basic_info_data_t prev_info,info;  mach_vm_size_t size, prev_size;  mach_port_t object_name;  mach_msg_type_number_t count;  //模块总共读的块数  int nsubregions = 0;  // 已遍历的模块数  int num_printed = 0;

  count = VM_REGION_BASIC_INFO_COUNT_64;
  kret = mach_vm_region (task, &address, &size, VM_REGION_BASIC_INFO,
             (vm_region_info_t) &info, &count, &object_name);  if (kret != KERN_SUCCESS)
    {      printf (""mach_vm_region: Error %d - %s"", kret, mach_error_string(kret));      return;
    }  //保存上一次遍历的模块信息  memcpy (&prev_info, &info, sizeof (vm_region_basic_info_data_t));
  prev_address = address;
  prev_size = size;  // 已获取1块
  nsubregions = 1;  for (;;)
    {      int print = 0;      int done = 0;

      address = prev_address + prev_size;      /* Check to see if address space has wrapped around. */      // 遍历模块结束      if (address == 0)
    { 
        print = done = 1;
    }      if (!done)
        {          // Even on iOS, we use VM_REGION_BASIC_INFO_COUNT_64. This works.

          count = VM_REGION_BASIC_INFO_COUNT_64;          // 读取从address开始的第一个正确的模块信息，注意这里可能不是一个模块头
          kret =
            mach_vm_region (task, &address, &size, VM_REGION_BASIC_INFO,
                          (vm_region_info_t) &info, &count, &object_name);          if (kret != KERN_SUCCESS)
            {        /* iOS 6 workaround - attempt to reget the task port to avoiD */        /* ""(ipc/send) invalid destination port"" (1000003 or something) */
        task_for_pid(mach_task_self(),g_pid, &task);        // 重新获取一遍
        kret =
            mach_vm_region (task, &address, &size, VM_REGION_BASIC_INFO,
                              (vm_region_info_t) &info, &count, &object_name);

        }       if (kret != KERN_SUCCESS)
    {        fprintf (stderr,""mach_vm_region failed for address %p - Error: %x\n"", address,(kret));
              size = 0;    if (address >= 0x4000000) return;
              print = done = 1;
            }
        }      // 如果上一个内存起始地址+内存大小！=当前的地址，说明是新的模块      if (address != prev_address + prev_size)
        print = 1;      // 如果内存属性不同，说明是新的模块      if ((info.protection != prev_info.protection)
          || (info.max_protection != prev_info.max_protection)
          || (info.inheritance != prev_info.inheritance)
          || (info.shared != prev_info.reserved)
          || (info.reserved != prev_info.reserved))
        print = 1;      //如果是新的模块，获取它的其它信息      if (print)
        {      int   print_size;      char *print_size_unit;          if (num_printed == 0)            printf (""Region "");          else            printf (""   ... "");

       findListOfBinaries(task, prev_address, prev_size);      /* Quick hack to show size of segment, which GDB does not */
      print_size = prev_size;      if (print_size > 1024) { print_size /= 1024; print_size_unit = ""K""; }      if (print_size > 1024) { print_size /= 1024; print_size_unit = ""M""; }      if (print_size > 1024) { print_size /= 1024; print_size_unit = ""G""; }      /* End Quick hack */          printf ("" %p-%p [%d%s](%s/%s; %s, %s, %s) %s"",
                           (prev_address),
                           (prev_address + prev_size),
               print_size,
               print_size_unit,
                           protection_bits_to_rwx (prev_info.protection),
                           protection_bits_to_rwx (prev_info.max_protection),
                           unparse_inheritance (prev_info.inheritance),
                           prev_info.shared ? ""shared"" : ""private"",
                           prev_info.reserved ? ""reserved"" : ""not-reserved"",
               behavior_to_text (prev_info.behavior));          if (nsubregions > 1)            printf ("" (%d sub-regions)"", nsubregions);          printf (""\n"");          // 把此次内存信息保存起来
          prev_address = address;
          prev_size = size;          memcpy (&prev_info, &info, sizeof (vm_region_basic_info_data_t));
          nsubregions = 1;

          num_printed++;
        }      else
        {          //如果不是新的模块，只增加模块大小
          prev_size += size;
          nsubregions++;
        }      if ((max > 0) && (num_printed >= max))
    {     printf (""Max %d num_printed %d\n"", max, num_printed);
        done = 1;
    }      if (done)        break;
    }
}void main(int argc, char **argv){    struct vm_region_basic_info vmr;    kern_return_t   rc;    mach_port_t task;    mach_vm_size_t  size = 8;    vm_region_info_t    info = (vm_region_info_t) malloc(10000);    mach_msg_type_number_t  info_count;    mach_port_t     object_name;    //初始值设为1    mach_vm_address_t   addr =1;    int pid;    //需要提供参数1为目标进程的PID        if (!argv[1]) { printf (""Usage: %s <PID>\n""); exit (1);}        //把参数1转换成pid
    pid = atoi(argv[1]);
    g_pid = pid; // req for iOS 6    // 获取目标进程的task
    rc = task_for_pid(mach_task_self(),pid, &task);    if (rc) { fprintf (stderr, ""task_for_pid() failed with error %d - %s\n"", rc, mach_error_string(rc)); exit(1); }    printf (""RC %d - Task: %d\n"",rc, task);

    macosx_debug_regions (task, addr, 1000);    int i ;    for ( i = 0; i < g_imageCount; i++)
    {        printf(""Image: %s loaded @%p\n"",
            g_dii[i].imageFilePath, g_dii[i].imageLoadAddress);
    }    printf(""Done\n"");

}

方式二：
通过_dyld_getimage*系列API

头文件：dyld.h
函数原型：//获取当前进程加载的模块数。uint32_t                    _dyld_image_count(void);//获取内存中某个模块的头部指针。const struct mach_header*   _dyld_get_image_header(uint32_t image_index);//获取内存中某个模块的slide值。intptr_t                    _dyld_get_image_vmaddr_slide(uint32_t image_index);// 获取内存中某个模块的名称。const char*                 _dyld_get_image_name(uint32_t image_index);
实现：#importint32_t nModNums= _dyld_image_count();const char *pszModName = NULL;intptr_t pModSlide = 0;const struct mach_header* pModHeader = NULL;for (uint32_t i = 0; i < nModNums; i++)
{
pModSlide  = _dyld_get_image_vmaddr_slide(i);
pszModName = _dyld_get_image_name(i);
pModHeader = _dyld_get_image_header(i);
}

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