📄 hello.c
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/* * Dpi for "Hello World". * * This server is an example. Play with it and modify to your taste. * * Copyright 2003 Jorge Arellano Cid <jcid@dillo.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */#include <glib.h>#include <unistd.h>#include <sys/types.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>/*---------------------------------------------------------------------------*//* * Task: given a tag and an attribute name, return its value. * (character stuffing is removed here) * Return value: the attribute value, or NULL if not present or malformed. * (copied from bookmarks.c) */char *Get_attr_value(char *tag, int tagsize, char *attrname){ char *p, *q, *ltag, quote, *start, *val = NULL; ltag = g_strndup(tag, tagsize); if ((p = strstr(ltag, attrname)) && (p = strchr(p, '=')) && (p = strpbrk(p, "'\"")) ) { quote = *p; start = ++p; while ((q = strchr(p, quote)) && q[1] == quote) p = q + 2; if (q) { val = g_strndup(start, q - start); for (p = q = val; (*q = *p); ++p, ++q) if ((*p == '"' || *p == '\'') && p[1] == p[0]) ++p; } } g_free(ltag); return val;}/* * Send the stream with coarse buffering (fastest) */gint send_stream_4(FILE *in_stream, gchar *url){ gchar buf[4096]; size_t n; while ((n = fread (buf, 1, 4096, in_stream)) > 0) fwrite(buf, 1, n, stdout); return 0;}/* * Escape unsafe characters as html entities. * Return value: NULL if there's no need to escape, New string otherwise. * (borrowed from Dillo's file.c) */static gchar *Html_escape(const gchar *str){ static const char *unsafe_chars = "&<>\"'"; static const char *unsafe_rep[] = { "&", "<", ">", """, "'" }; gchar *p; GString *gstr; gint i; if ((p = strpbrk(str, unsafe_chars))) { gstr = g_string_sized_new(64); for (i = 0; str[i]; ++i) { if ((p = strchr(unsafe_chars, str[i]))) g_string_append(gstr, unsafe_rep[p - unsafe_chars]); else g_string_append_c(gstr, str[i]); } p = gstr->str; g_string_free(gstr, FALSE); } return p;}/* * */int main(void){ FILE *F_stdin, *in_stream; gchar *dpip_tag = NULL, *cmd = NULL, *url = NULL, *child_cmd = NULL; gchar *esc_tag; gint i, rd_len, ret; gchar buf[4096]; g_printerr("hello.dpi:: starting...\n"); /* Read the dpi command from STDIN. * (the buffer has a fixed size, but is enough for this example!) */ F_stdin = fdopen (STDIN_FILENO, "r"); rd_len = read(STDIN_FILENO, buf, 4096); dpip_tag = g_strndup(buf, rd_len); fclose(F_stdin); g_printerr("[%s]\n", dpip_tag); cmd = Get_attr_value(dpip_tag, strlen(dpip_tag), "cmd"); url = Get_attr_value(dpip_tag, strlen(dpip_tag), "url"); /* Start sending our answer */ printf("<dpi cmd='start_send_page' url='%s'>", url); printf("Content-type: text/html\n\n"); printf("<html>\n" "<head><title>Simple dpi test page (hello.dpi)</title></head>\n" "<body><hr><h1>Hello world!</h1><hr>\n" "<br><br>\n"); /* Show the dpip tag we received */ esc_tag = Html_escape(dpip_tag); printf("<h3>dpip tag received:</h3>\n"); printf("<pre>\n%s</pre>\n", esc_tag); printf("<br><small>(<b>dpip:</b> dpi protocol)</small><br><br><br>\n"); g_free(esc_tag); /* No something more interesting, * fork a command and show its feedback */ if (cmd && url) { child_cmd = g_strdup("date -R"); g_printerr("[%s]\n", child_cmd); /* Fork, exec command, get its output and answer */ if ((in_stream = popen(child_cmd, "r")) == NULL) { perror("popen"); return EXIT_FAILURE; } printf("<h3>date:</h3>\n"); printf("<pre>\n"); /* Read/Write */ i = send_stream_4(in_stream, url); printf("</pre>\n"); if ((ret = pclose(in_stream)) != 0) g_printerr("popen: [%d]\n", ret); g_free(child_cmd); } printf("</body></html>\n"); g_free(cmd); g_free(url); g_free(dpip_tag); return 0;}⌨️ 快捷键说明
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