linux c 技术

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#include <stdio.h>#include <string.h>#include <dlfcn.h>//#include <unistd.h>#include <math.h>//源程序：http://blog.chinaunix.net/uid-26874207-id-4936260.html//linux c动态调用 /*; Needed Library 'libstdc++.so'.plt:000085CC                         ; Needed Library 'libm.so'.plt:000085CC                         ; Needed Library 'libc.so'.plt:000085CC                         ; Needed Library 'libdl.so'.plt:000085CC                         ;typedef UINT (WINAPI *URLDownloadToFileAT)(LPUNKNOWN,LPCSTR,LPCSTR,DWORD,LPBINDSTATUSCALLBACK); URLDownloadToFileAT pURLDownloadToFileA = (URLDownloadToFileAT)GetProcAddress(LoadLibraryA("Urlmon.dll"),"URLDownloadToFileA");*///http://blog.csdn.net/jernymy/article/details/6903683// -ldlint main(int argc, char *argv[]){char * dlso="libc.so";typedef int (* getpidT)();//typedef __pid_t (* getpidT)();getpidT pgetpid=(getpidT)dlsym(dlopen(dlso, RTLD_NOW),"getpid");//typedef uid_t (* getuidT)();typedef int (* getuidT)();getuidT pgetuid=(getuidT)dlsym(dlopen(dlso, RTLD_NOW),"getuid");typedef int (* execlpT)(__const char *__file, __const char *__arg, ...);execlpT pexeclp=(execlpT)dlsym(dlopen("xxx.so", RTLD_NOW),"execlp");char *dlmath="libm.so";typedef double (* cosT)(double );cosT pcos=(cosT)dlsym(dlopen(dlmath, RTLD_NOW),"cos");//double sin(double x);typedef double (* sinT)(double x);sinT psin=(sinT)dlsym(dlopen(dlmath, RTLD_NOW),"sin");//开方 double sqrt (double x);typedef double (* sqrtT)(double x);sqrtT psqrt=(sqrtT)dlsym(dlopen(dlmath, RTLD_NOW),"sqrt");//double pow (double base, double exponent);typedef double (* powT)(double base, double exponent);powT ppow=(powT)dlsym(dlopen(dlmath, RTLD_NOW),"pow");printf("pgetpid=%d\n",pgetpid());printf("pgetuid=%d\n",pgetuid());printf("pcos=%f psin=%f psqrt=%f ppow=%f \n",pcos(2.0),psin(90.0),psqrt(1024.0),ppow(25,2.0));pexeclp("firefox", "firefox", NULL);pexeclp("/bin/sh", "sh", NULL); //在ubuntu运行//printf("pid=%d uid=%d\n",getpid(),getuid());return 0;}

#include <stdio.h>#include <dlfcn.h>int main(int argc, char **argv) {void *handle;double (*cosine)(double);char *error;handle = dlopen ("libm.so", RTLD_LAZY);if (!handle) {fprintf (stderr, "%s\n", dlerror());exit(1);}cosine = dlsym(handle, "cos");if ((error = dlerror()) != NULL)  {fprintf (stderr, "%s\n", error);exit(1);}printf ("%f\n", (*cosine)(2.0));dlclose(handle);return 0;}

附上linux 常用库文件demo:

libacl.so.1
libacl.so.1.1.0
libaio.so.1
libaio.so.1.0.1
libanl-2.15.so
libanl.so.1
libattr.so.1
libattr.so.1.1.0
libBrokenLocale-2.15.so
libBrokenLocale.so.1
libbz2.so.1
libbz2.so.1.0
libbz2.so.1.0.4
libc-2.15.so
libcap.so.2
libcap.so.2.22
libcidn-2.15.so
libcidn.so.1
libcom_err.so.2
libcom_err.so.2.1
libcrypt-2.15.so
libcrypto.so.0.9.8
libcrypto.so.1.0.0
libcrypt.so.1
libc.so.6
libdbus-1.so.3
libdbus-1.so.3.5.8
libdl-2.15.so
libdl.so.2
libexpat.so.1
libexpat.so.1.5.2
libgcc_s.so.1
libgcrypt.so.11
libgcrypt.so.11.7.0
libglib-2.0.so.0
libglib-2.0.so.0.3200.4
libgpg-error.so.0
libgpg-error.so.0.8.0
libkeyutils.so.1
libkeyutils.so.1.4
libm-2.15.so
libmemusage.so
libm.so.6
libncurses.so.5
libncurses.so.5.9
libncursesw.so.5
libncursesw.so.5.9
libnsl-2.15.so
libnsl.so.1
libnss_compat-2.15.so
libnss_compat.so.2
libnss_dns-2.15.so
libnss_dns.so.2
libnss_files-2.15.so
libnss_files.so.2
libnss_hesiod-2.15.so
libnss_hesiod.so.2
libnss_nis-2.15.so
libnss_nisplus-2.15.so
libnss_nisplus.so.2
libnss_nis.so.2
libpcprofile.so
libpcre.so.3
libpcre.so.3.12.1
libpng12.so.0
libpng12.so.0.46.0
libpthread-2.15.so
libpthread.so.0
libresolv-2.15.so
libresolv.so.2
librt-2.15.so
librt.so.1
libSegFault.so
libselinux.so.1
libslang.so.2
libslang.so.2.2.4
libssl.so.0.9.8
libssl.so.1.0.0
libthread_db-1.0.so
libthread_db.so.1
libtinfo.so.5
libtinfo.so.5.9
libudev.so.0
libudev.so.0.13.0
libusb-0.1.so.4
libusb-0.1.so.4.4.4
libutil-2.15.so
libutil.so.1
libuuid.so.1
libuuid.so.1.3.0
libwrap.so.0
libwrap.so.0.7.6
libz.so.1
libz.so.1.2.3.4

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