w3mail

commit 98abdf81d2683dcda7b9b9fa3f8c58f061f88c26
Author: Tomas Hlavaty <tom@logand.com>
Date:   Mon, 15 Nov 2010 21:57:47 +0100

Initial commit

Diffstat:
A
Makefile
 | 
9
+++++++++
A
cmd.c
 | 
57
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
cmd.h
 | 
14
++++++++++++++
A
io.c
 | 
39
+++++++++++++++++++++++++++++++++++++++
A
io.h
 | 
9
+++++++++
A
w3mail.c
 | 
46
++++++++++++++++++++++++++++++++++++++++++++++

6 files changed, 174 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -0,0 +1,9 @@
+all: w3mail
+
+CFLAGS=-g -Wall -std=c99 -pedantic -D_XOPEN_SOURCE=600
+
+w3mail: io.o cmd.o w3mail.o
+	$(CC) $(CFLAGS) -o w3mail io.o cmd.o w3mail.o
+
+clean:
+	rm -f *~ *.o w3mail
diff --git a/cmd.c b/cmd.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+#include "cmd.h"
+#include "io.h"
+
+extern void quit(int code, char *fmt, ...);
+extern const int BLEN;
+
+void wget(char *url, char *fname) {
+  int pid = fork();
+  if(pid < 0) quit(pid, "wget(): fork failed");
+  else if(pid == 0) execlp("wget", "wget", "-q", "-O", fname, "--", url, NULL);
+  else wait(NULL);
+}
+
+static void cb_md5sum(void *udata, FILE* in) {
+  char *sum = udata;
+  sum = fgets(sum, 33, in);
+}
+
+void md5sum(char *fname, char *sum) {
+  char cmd[BLEN];
+  snprintf(cmd, BLEN, "md5sum '%s'", fname);
+  in(sum, cb_md5sum, cmd);
+}
+
+static void echo(char *fname, FILE *out) {
+  FILE *in = fopen(fname, "r");
+  if(!in) quit(1, "echo(): cannot open input file '%s'", fname);
+  char buf[BLEN];
+  int n;
+  while(0 < (n = fread(buf, sizeof(char), BLEN, in)))
+    fwrite(buf, sizeof(char), n, out);
+  fclose(in);
+}
+
+#define pr(...) {fpr(out, __VA_ARGS__, NULL); fprintf(out, "\r\n");}
+
+void cb_sendmail(void *udata, FILE* out) {
+  struct sendmail *x = udata;
+  pr("From: ", x->from);
+  pr("To: ", x->to);
+  if(x->id) pr("Message-ID: ", x->id);
+  pr("Subject: ", x->subj);
+  pr("User-Agent: w3mail");
+  pr("MIME-Version: 1.0");
+  pr("Content-Type: text/html"); // ; charset=utf-8
+  pr("Content-Disposition: inline; filename=", x->fname);
+  pr("Content-Transfer-Encoding: 8bit");
+  pr("");
+  echo(x->fname, out);
+  pr("");
+  pr("");
+}
diff --git a/cmd.h b/cmd.h
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+void wget(char *url, char *fname);
+void md5sum(char *fname, char *sum);
+
+struct sendmail {
+  char *from;
+  char *to;
+  char *id;
+  char *subj;
+  char *fname; // TODO char *fname[]
+};
+
+void cb_sendmail(void *udata, FILE* out);
diff --git a/io.c b/io.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdarg.h>
+
+#include "io.h"
+
+extern void quit(int code, char *fmt, ...);
+
+void in(void *udata, in_cb cb, char *cmd) {
+  FILE *pipe = popen(cmd, "r");
+  if(!pipe) quit(1, "in(): cannot open pipe to '%s'", cmd);
+  cb(udata, pipe);
+  pclose(pipe);
+}
+
+void out(void *udata, out_cb cb, char *cmd) {
+  FILE *pipe = popen(cmd, "w");
+  if(!pipe) quit(1, "out(): cannot open pipe to '%s'", cmd);
+  cb(udata, pipe);
+  pclose(pipe);
+}
+
+void tmpf(void *udata, tmpf_cb cb, char *fname) {
+  int fd = mkstemp(fname);
+  if(fd == -1) quit(errno, "tmpf(): cannot create temporary file '%s'", fname);
+  close(fd);
+  cb(udata, fname);
+  unlink(fname);
+}
+
+void fpr(FILE *out, ...) {
+  va_list v;
+  va_start(v, out);
+  char *a;
+  while((a = va_arg(v, char *))) fprintf(out, "%s", a);
+  va_end(v);
+}
diff --git a/io.h b/io.h
@@ -0,0 +1,9 @@
+typedef void (*in_cb)(void *udata, FILE* in);
+typedef void (*out_cb)(void *udata, FILE* out);
+typedef void (*tmpf_cb)(void *udata, char *fname);
+
+void in(void *udata, in_cb cb, char *cmd);
+void out(void *udata, out_cb cb, char *cmd);
+void tmpf(void *udata, tmpf_cb cb, char *fname);
+
+void fpr(FILE *out, ...);
diff --git a/w3mail.c b/w3mail.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#include "cmd.h"
+#include "io.h"
+
+const int BLEN = 1024;
+
+void quit(int code, char *fmt, ...) { // TODO __func__
+  va_list v;
+  va_start(v, fmt);
+  char msg[BLEN];
+  vsnprintf(msg, BLEN, fmt, v);
+  perror(msg);
+  exit(code);
+  va_end(v);
+}
+
+struct w3mail {
+  char *cmd;
+  char *from;
+  char *to;
+  char *host;
+  char *url;
+};
+
+void cb_w3mail(void *udata, char *fname) {
+  struct w3mail *x = udata;
+  char sum[BLEN], id[BLEN], subj[BLEN];
+  wget(x->url, fname);
+  md5sum(fname, sum);
+  snprintf(id, BLEN, "<%s@%s>", sum, x->host);
+  snprintf(subj, BLEN, "[w3mail] %s", x->url);
+  struct sendmail y = {x->from, x->to, id, subj, fname};
+  out(&y, cb_sendmail, x->cmd);
+}
+
+int main(int argc, char *argv[]) {
+  if(argc != 6) quit(1, "usage: %s cmd from to host url", argv[0]);
+  char fname[BLEN];
+  snprintf(fname, BLEN, "/tmp/w3mail-XXXXXX");
+  struct w3mail x = {argv[1], argv[2], argv[3], argv[4], argv[5]};
+  tmpf(&x, cb_w3mail, fname);
+  return 0;
+}