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ftp, add_file_cmd_to_str: Check errors from string functions.

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Use goto for error handling.  Free all strings in the same place.

[ Bug 942; backported from commit c6b8fa7151
  in ELinks 0.12.GIT.  --KON ]
This commit is contained in:
Kalle Olavi Niemitalo 2007-03-18 09:28:08 +02:00 committed by Kalle Olavi Niemitalo
parent 465166a940
commit 1c3c19c91b
1 changed files with 70 additions and 76 deletions
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146
src/protocol/ftp/ftp.c
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@ -664,143 +664,137 @@ is_ftp_pathname_safe(const struct string *s)
static struct ftp_connection_info *
add_file_cmd_to_str(struct connection *conn)
{
struct ftp_connection_info *ftp;
struct string command, ftp_data_command;
int ok = 0;
struct ftp_connection_info *ftp = NULL;
struct string command = NULL_STRING;
struct string ftp_data_command = NULL_STRING;
struct string pathname = NULL_STRING;
if (!conn->uri->data) {
INTERNAL("conn->uri->data empty");
abort_connection(conn, S_INTERNAL);
return NULL;
goto ret;
}
/* This will be reallocated below when we know how long the
* command string should be. Error handling could be
* simplified a little by allocating this initial structure on
* the stack, but it's several kilobytes long so that might be
* risky. */
ftp = mem_calloc(1, sizeof(*ftp));
if (!ftp) {
abort_connection(conn, S_OUT_OF_MEM);
return NULL;
goto ret;
}
conn->info = ftp; /* Freed when connection is destroyed. */
if (!init_string(&command)) {
if (!init_string(&command)
|| !init_string(&ftp_data_command)
|| !init_string(&pathname)) {
abort_connection(conn, S_OUT_OF_MEM);
return NULL;
}
if (!init_string(&ftp_data_command)) {
done_string(&command);
abort_connection(conn, S_OUT_OF_MEM);
return NULL;
goto ret;
}
if (!get_ftp_data_socket(conn, &ftp_data_command)) {
done_string(&command);
done_string(&ftp_data_command);
INTERNAL("Ftp data socket failure");
abort_connection(conn, S_INTERNAL);
return NULL;
goto ret;
}
if (!add_uri_to_string(&pathname, conn->uri, URI_PATH)) {
abort_connection(conn, S_OUT_OF_MEM);
goto ret;
}
decode_uri_string(&pathname);
if (!is_ftp_pathname_safe(&pathname)) {
abort_connection(conn, S_BAD_URL);
goto ret;
}
if (!conn->uri->datalen
|| conn->uri->data[conn->uri->datalen - 1] == '/') {
struct string uri_string;
/* Commands to get directory listing. */
if (!init_string(&uri_string)) {
done_string(&command);
done_string(&ftp_data_command);
abort_connection(conn, S_OUT_OF_MEM);
return NULL;
}
ftp->dir = 1;
ftp->pending_commands = 4;
/* ASCII */
add_to_string(&command, "TYPE A");
add_crlf_to_string(&command);
if (!add_to_string(&command, "TYPE A") /* ASCII */
|| !add_crlf_to_string(&command)
add_string_to_string(&command, &ftp_data_command);
|| !add_string_to_string(&command, &ftp_data_command)
add_to_string(&command, "CWD ");
add_uri_to_string(&uri_string, conn->uri, URI_PATH);
decode_uri_string(&uri_string);
if (!is_ftp_pathname_safe(&uri_string)) {
done_string(&uri_string);
done_string(&command);
done_string(&ftp_data_command);
abort_connection(conn, S_BAD_URL);
return NULL;
|| !add_to_string(&command, "CWD ")
|| !add_string_to_string(&command, &pathname)
|| !add_crlf_to_string(&command)
|| !add_to_string(&command, "LIST")
|| !add_crlf_to_string(&command)) {
abort_connection(conn, S_OUT_OF_MEM);
goto ret;
}
add_string_to_string(&command, &uri_string);
add_crlf_to_string(&command);
add_to_string(&command, "LIST");
add_crlf_to_string(&command);
done_string(&uri_string);
conn->from = 0;
} else {
struct string uri_string;
/* Commands to get a file. */
if (!init_string(&uri_string)) {
done_string(&command);
done_string(&ftp_data_command);
abort_connection(conn, S_OUT_OF_MEM);
return NULL;
}
ftp->dir = 0;
ftp->pending_commands = 3;
/* BINARY */
add_to_string(&command, "TYPE I");
add_crlf_to_string(&command);
if (!add_to_string(&command, "TYPE I") /* BINARY */
|| !add_crlf_to_string(&command)
add_string_to_string(&command, &ftp_data_command);
|| !add_string_to_string(&command, &ftp_data_command)) {
abort_connection(conn, S_OUT_OF_MEM);
goto ret;
}
if (conn->from || conn->progress->start > 0) {
add_to_string(&command, "REST ");
add_long_to_string(&command, conn->from
? conn->from
: conn->progress->start);
add_crlf_to_string(&command);
const off_t offset = conn->from
? conn->from
: conn->progress->start;
if (!add_to_string(&command, "REST ")
|| !add_long_to_string(&command, offset)
|| !add_crlf_to_string(&command)) {
abort_connection(conn, S_OUT_OF_MEM);
goto ret;
}
ftp->rest_sent = 1;
ftp->pending_commands++;
}
add_to_string(&command, "RETR ");
add_uri_to_string(&uri_string, conn->uri, URI_PATH);
decode_uri_string(&uri_string);
if (!is_ftp_pathname_safe(&uri_string)) {
done_string(&uri_string);
done_string(&command);
done_string(&ftp_data_command);
abort_connection(conn, S_BAD_URL);
return NULL;
if (!add_to_string(&command, "RETR ")
|| !add_string_to_string(&command, &pathname)
|| !add_crlf_to_string(&command)) {
abort_connection(conn, S_OUT_OF_MEM);
goto ret;
}
add_string_to_string(&command, &uri_string);
add_crlf_to_string(&command);
done_string(&uri_string);
}
done_string(&ftp_data_command);
ftp->opc = ftp->pending_commands;
/* 1 byte is already reserved for cmd_buffer in struct ftp_connection_info. */
ftp = mem_realloc(ftp, sizeof(*ftp) + command.length);
if (!ftp) {
done_string(&command);
abort_connection(conn, S_OUT_OF_MEM);
return NULL;
goto ret;
}
conn->info = ftp; /* in case mem_realloc moved the buffer */
memcpy(ftp->cmd_buffer, command.source, command.length + 1);
done_string(&command);
conn->info = ftp;
ok = 1;
return ftp;
ret:
/* If @ok is false here, then abort_connection has already
* freed @ftp, which now is a dangling pointer. */
done_string(&pathname);
done_string(&ftp_data_command);
done_string(&command);
return ok ? ftp : NULL;
}
static void