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#include "spm.h"
#include "shlib.h"
char *objdump(const char *_filename, char *_args) {
// do not expose this function
char *filename = NULL;
char *result = NULL;
Process *proc = NULL;
char cmd[PATH_MAX];
memset(cmd, '\0', sizeof(cmd));
if (_filename == NULL) {
spmerrno = EINVAL;
spmerrno_cause("_filename was NULL");
return NULL;
}
if ((filename = strdup(_filename)) == NULL) {
fprintf(SYSERROR);
return NULL;
}
strchrdel(filename, SHELL_INVALID);
snprintf(cmd, sizeof(cmd), "%s %s '%s'", SPM_SHLIB_EXEC, _args, filename);
shell(&proc, SHELL_OUTPUT, cmd);
if (proc->returncode != 0) {
free(filename);
shell_free(proc);
return NULL;
}
result = strdup(proc->output);
free(filename);
shell_free(proc);
return result;
}
char *shlib_rpath(const char *filename) {
char **data = NULL;
char *raw_data = NULL;
char *result = NULL;
if (filename == NULL) {
spmerrno = EINVAL;
spmerrno_cause("filename was NULL");
return NULL;
}
if ((raw_data = objdump(filename, SPM_SHLIB_EXEC_ARGS)) == NULL) {
return NULL;
}
// Split output into individual lines
if ((data = split(raw_data, "\n")) == NULL) {
free(raw_data);
return NULL;
}
// Collapse all whitespace in each line
// i.e. " stuff things" -> "stuff things"
for (size_t i = 0; data[i] != NULL; i++) {
data[i] = normalize_space(data[i]);
}
for (size_t i = 0; data[i] != NULL; i++) {
char **field = NULL;
char reason[255] = {0,};
#if OS_LINUX
// Extract the RPATH record (second field)
if (startswith(data[i], "RPATH")) {
if ((field = split(data[i], " ")) == NULL) {
break;
}
// record library path
result = strdup(field[1]);
split_free(field);
break;
}
#elif OS_DARWIN
size_t offset_name = i + 2; // how many lines to look ahead after reaching LC_RPATH
size_t numLines;
for (numLines = 0; data[numLines] != NULL; numLines++); // get line count
// Find APPLE's equivalent to RPATH on Linux
if (startswith(data[i], "cmd LC_RPATH")) {
// Don't overrun the data buffer
if (offset_name > numLines || data[offset_name] == NULL) {
break;
}
// split on: "path /library/path"
if ((field = split(data[offset_name], " ")) == NULL) {
sprintf(reason, "'%s' produced unreadable output at offset %zu", SPM_SHLIB_EXEC, offset_name);
spmerrno = SPM_ERR_PARSE;
spmerrno_cause(reason);
break;
}
// verify it was actually "path ..."
if (strcmp(field[0], "path") != 0) {
sprintf(reason, "'%s' produced unexpected LC_RPATH format between lines %zu:%zu", SPM_SHLIB_EXEC, i, offset_name);
spmerrno = SPM_ERR_PARSE;
spmerrno_cause(reason);
break;
}
// record library path
result = strdup(field[1]);
split_free(field);
break;
}
#endif
}
free(raw_data);
split_free(data);
return result;
}
StrList *shlib_deps(const char *filename) {
char **data = NULL;
char *raw_data = NULL;
StrList *result = NULL;
if (filename == NULL) {
spmerrno = EINVAL;
spmerrno_cause("filename was NULL");
return NULL;
}
// Get output from objdump
if ((raw_data = objdump(filename, SPM_SHLIB_EXEC_ARGS)) == NULL) {
return NULL;
}
// Initialize list array
if ((result = strlist_init()) == NULL) {
free(raw_data);
return NULL;
}
// Split output into individual lines
if ((data = split(raw_data, "\n")) == NULL) {
free(raw_data);
strlist_free(result);
return NULL;
}
// Collapse all whitespace in each line
// i.e. " stuff things" -> "stuff things"
for (size_t i = 0; data[i] != NULL; i++) {
data[i] = normalize_space(data[i]);
}
for (size_t i = 0; data[i] != NULL; i++) {
char **field = NULL;
char reason[255] = {0,};
#if OS_LINUX
// Extract the NEEDED libraries (second field)
// AFAIK when "NEEDED" is present, a string containing the library name is guaranteed to be there
if (startswith(data[i], "NEEDED")) {
if ((field = split(data[i], " ")) == NULL) {
strlist_free(result);
result = NULL;
break;
}
// record library path
strlist_append(result, field[1]);
split_free(field);
}
#elif OS_DARWIN
size_t offset_name = i + 2; // how many lines to look ahead after reaching LC_LOAD_DYLIB
size_t numLines;
for (numLines = 0; data[numLines] != NULL; numLines++); // get line count
// Find APPLE's equivalent to NEEDED on Linux
if (startswith(data[i], "cmd LC_LOAD_DYLIB")) {
// Don't overrun the data buffer
if (offset_name > numLines || data[offset_name] == NULL) {
break;
}
// split on: "name /library/path"
if ((field = split(data[offset_name], " ")) == NULL) {
sprintf(reason, "'%s' produced unreadable output at offset %zu", SPM_SHLIB_EXEC, offset_name);
spmerrno = SPM_ERR_PARSE;
spmerrno_cause(reason);
strlist_free(result);
result = NULL;
break;
}
// verify it was actually "name ..."
if (strcmp(field[0], "name") != 0) {
sprintf(reason, "'%s' produced unexpected LC_LOAD_DYLIB format between lines %zu:%zu", SPM_SHLIB_EXEC, i, offset_name);
spmerrno = SPM_ERR_PARSE;
spmerrno_cause(reason);
break;
}
// record library path
strlist_append(result, field[1]);
split_free(field);
}
#endif
}
free(raw_data);
split_free(data);
return result;
}
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