Verified Commit f27ac629 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

Intercept links function family

parent 1f95ba1d

ifs/include/preload/passthrough.hpp

+5 −0
Original line number Diff line number Diff line
@@ -102,6 +102,11 @@ extern void* libc_fchdir; 
extern void* libc_getcwd;

extern void* libc_get_current_dir_name;



extern void* libc_link;

extern void* libc_linkat;

extern void* libc_symlink;

extern void* libc_symlinkat;



extern void* libc_realpath;



void init_passthrough_if_needed();

ifs/src/preload/intcp_functions.cpp

+51 −0
Original line number Diff line number Diff line
@@ -1390,6 +1390,57 @@ char *get_current_dir_name(void) { 
    return nullptr;

}





int link(const char *oldpath, const char *newpath) {

    init_passthrough_if_needed();

    if(CTX->initialized()) {

        CTX->log()->trace("{}() called [oldpath: '{}', newpath: '{}']",

               __func__, oldpath, newpath);

        CTX->log()->error("{}() not implemented", __func__);

        errno = ENOTSUP;

        return -1;

    }

    return LIBC_FUNC(link, oldpath, newpath);

}



int linkat(int olddirfd, const char *oldpath,

        int newdirfd, const char *newpath, int flags) {

    init_passthrough_if_needed();

    if(CTX->initialized()) {

        CTX->log()->trace("{}() called [olddirfd: '{}', oldpath: '{}',\

                newdirfd: '{}', newpath: '{}', flags: '{}']",

                __func__, olddirfd, oldpath, newdirfd, newpath, flags);

        CTX->log()->error("{}() not implemented", __func__);

        errno = ENOTSUP;

        return -1;

    }

    return LIBC_FUNC(linkat, olddirfd, oldpath, newdirfd, newpath, flags);

}



int symlink(const char *oldpath, const char *newpath) {

    init_passthrough_if_needed();

    if(CTX->initialized()) {

        CTX->log()->trace("{}() called [oldpath: '{}', newpath: '{}']",

               __func__, oldpath, newpath);

        CTX->log()->error("{}() not implemented", __func__);

        errno = ENOTSUP;

        return -1;

    }

    return LIBC_FUNC(symlink, oldpath, newpath);

}



int symlinkat(const char *oldpath, int fd, const char *newpath) {

    init_passthrough_if_needed();

    if(CTX->initialized()) {

        CTX->log()->trace("{}() called [oldpath: '{}', newpath: '{}']",

               __func__, oldpath, newpath);

        CTX->log()->error("{}() not implemented", __func__);

        errno = ENOTSUP;

        return -1;

    }

    return LIBC_FUNC(symlinkat, oldpath, fd, newpath);

}



char *realpath(const char *path, char *resolved_path) {

    init_passthrough_if_needed();

    if(!CTX->initialized()) {

ifs/src/preload/passthrough.cpp

+10 −0
Original line number Diff line number Diff line
@@ -103,6 +103,11 @@ void* libc_fchdir; 
void* libc_getcwd;

void* libc_get_current_dir_name;



void* libc_link;

void* libc_linkat;

void* libc_symlink;

void* libc_symlinkat;



void* libc_realpath;
@@ -204,6 +209,11 @@ void init_passthrough_() { 
    libc_getcwd = dlsym(libc, "getcwd");

    libc_get_current_dir_name = dlsym(libc, "get_current_dir_name");



    libc_link = dlsym(libc, "link");

    libc_linkat = dlsym(libc, "linkat");

    libc_symlink = dlsym(libc, "symlink");

    libc_symlinkat = dlsym(libc, "symlinkat");



    libc_realpath = dlsym(libc, "realpath");



}